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443 lines
117 KiB
HTML
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})(window)</script><script src="https://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script><script type="text/javascript" src ="/js/welcome.js" ></script><script src="/js/sweetalert.js"></script><link rel="stylesheet" href="/css/sweetalert.css"><!-- hexo injector head_end start --><link rel="stylesheet" href="https://npm.elemecdn.com/hexo-butterfly-swiper/lib/swiper.min.css" media="print" onload="this.media='all'"><link rel="stylesheet" href="https://npm.elemecdn.com/hexo-butterfly-swiper/lib/swiperstyle.css" media="print" onload="this.media='all'"><!-- hexo injector head_end end --><meta name="generator" content="Hexo 6.3.0"></head><body><div id="sidebar"><div id="menu-mask"></div><div id="sidebar-menus"><div class="avatar-img is-center"><img src="/img/avatar.jpg" onerror="onerror=null;src='/img/loading.gif'" alt="avatar"/></div><div class="sidebar-site-data site-data is-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">61</div></a><a href="/tags/"><div class="headline">标签</div><div class="length-num">39</div></a><a href="/categories/"><div class="headline">分类</div><div class="length-num">10</div></a></div><br/><div class="menus_items"><div class="menus_item"><a class="site-page" target="_blank" rel="noopener" href="https://gitee.com/JasonsGong/jasonsgong/pages"><i class="fa-fw fas fa-sync-alt"></i><span> 更新</span></a></div><div class="menus_item"><a class="site-page" target="_blank" rel="noopener" href="https://www.tutorialspoint.com/compile_java8_online.php"><i class="fa-fw fas fa-code"></i><span> 代码</span></a></div><div class="menus_item"><a class="site-page" href="/notice/"><i class="fa-fw fas fa-stream"></i><span> 公告</span></a></div><div class="menus_item"><a class="site-page" href="/website/"><i class="fa-fw fas fa-list"></i><span> 网址</span></a></div><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> 主页</span></a></div></div></div></div><div class="post" id="body-wrap"><header class="not-top-img" id="page-header"><nav id="nav"><span id="blog-info"><a href="/" title="The Blog"><img class="site-icon" src="/img/logo.png"/><span class="site-name">The Blog</span></a></span><div id="menus"><div id="search-button"><a class="site-page social-icon search" href="javascript:void(0);"><i class="fas fa-search fa-fw"></i><span> 搜索</span></a></div><div class="menus_items"><div class="menus_item"><a class="site-page" target="_blank" rel="noopener" href="https://gitee.com/JasonsGong/jasonsgong/pages"><i class="fa-fw fas fa-sync-alt"></i><span> 更新</span></a></div><div class="menus_item"><a class="site-page" target="_blank" rel="noopener" href="https://www.tutorialspoint.com/compile_java8_online.php"><i class="fa-fw fas fa-code"></i><span> 代码</span></a></div><div class="menus_item"><a class="site-page" href="/notice/"><i class="fa-fw fas fa-stream"></i><span> 公告</span></a></div><div class="menus_item"><a class="site-page" href="/website/"><i class="fa-fw fas fa-list"></i><span> 网址</span></a></div><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> 主页</span></a></div></div><div id="toggle-menu"><a class="site-page" href="javascript:void(0);"><i class="fas fa-bars fa-fw"></i></a></div></div></nav></header><main class="layout" id="content-inner"><div id="post"><div id="post-info"><h1 class="post-title">FreeMarker模板引擎</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2023-08-16T06:38:53.000Z" title="发表于 2023-08-16 14:38:53">2023-08-16</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2023-09-11T23:36:52.000Z" title="更新于 2023-09-12 07:36:52">2023-09-12</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/%E5%89%8D%E7%AB%AF/">前端</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">4.6k</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>21分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="FreeMarker模板引擎"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div><article class="post-content" id="article-container"><h1 id="一-FreeMarker介绍"><a href="#一-FreeMarker介绍" class="headerlink" title="一.FreeMarker介绍"></a>一.FreeMarker介绍</h1><p> FreeMarker 是一款 模板引擎： 即一种基于模板和要改变的数据， 并用来生成输出文本(HTML网页，电子邮件，配置文件，源代码等)的通用工具。 它不是面向最终用户的，而是一个Java类库，是一款程序员可以嵌入他们所开发产品的组件。</p>
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<p> 模板编写为FreeMarker Template Language (FTL)。它是简单的，专用的语言， <em>不是</em> 像PHP那样成熟的编程语言。 那就意味着要准备数据在真实编程语言中来显示，比如数据库查询和业务运算， 之后模板显示已经准备好的数据。在模板中，你可以专注于如何展现数据， 而在模板之外可以专注于要展示什么数据。</p>
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<p><img src="/pictures/image-20230816145012534.png" alt="image-20230816145012534"></p>
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<p><strong>技术选型对比</strong></p>
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<table>
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<thead>
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<tr>
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<th><strong>技术</strong></th>
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<th><strong>说明</strong></th>
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</tr>
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</thead>
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<tbody><tr>
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<td>Jsp</td>
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<td>Jsp 为 Servlet 专用，不能单独进行使用</td>
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</tr>
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<tr>
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<td>Velocity</td>
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<td>Velocity从2010年更新完 2.0 版本后，7年没有更新。Spring Boot 官方在 1.4 版本后对此也不在支持</td>
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</tr>
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<tr>
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<td>thmeleaf</td>
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<td>新技术，功能较为强大，但是执行的效率比较低</td>
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</tr>
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<tr>
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<td>freemarker</td>
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<td>性能好，强大的模板语言、轻量</td>
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</tr>
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</tbody></table>
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<h1 id="二-快速入门"><a href="#二-快速入门" class="headerlink" title="二.快速入门"></a>二.快速入门</h1><h2 id="1-环境搭建"><a href="#1-环境搭建" class="headerlink" title="1.环境搭建"></a>1.环境搭建</h2><h3 id="1-1-创建一个demo工程"><a href="#1-1-创建一个demo工程" class="headerlink" title="1.1 创建一个demo工程"></a>1.1 创建一个demo工程</h3><p>此处为了方便建的是子模块，测试使用可以创建一个单独的工程</p>
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<p><img src="/pictures/image-20230816145923876.png" alt="image-20230816145923876"></p>
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<h3 id="1-2-引入依赖"><a href="#1-2-引入依赖" class="headerlink" title="1.2 引入依赖"></a>1.2 引入依赖</h3><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">dependencies</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">dependency</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>org.springframework.boot<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>spring-boot-starter-web<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">dependency</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">dependency</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>org.springframework.boot<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>spring-boot-starter-freemarker<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">dependency</span>></span></span><br><span class="line"></span><br><span class="line"> <span class="tag"><<span class="name">dependency</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>org.springframework.boot<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>spring-boot-starter-test<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">dependency</span>></span></span><br><span class="line"> <span class="comment"><!-- lombok --></span></span><br><span class="line"> <span class="tag"><<span class="name">dependency</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>org.projectlombok<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>lombok<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">dependency</span>></span></span><br><span class="line"></span><br><span class="line"> <span class="comment"><!-- apache 对 java io 的封装工具库 --></span></span><br><span class="line"> <span class="tag"><<span class="name">dependency</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>org.apache.commons<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>commons-io<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>1.3.2<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">dependency</span>></span></span><br><span class="line"><span class="tag"></<span class="name">dependencies</span>></span></span><br></pre></td></tr></table></figure>
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||
|
||
<h3 id="1-3-添加配置"><a href="#1-3-添加配置" class="headerlink" title="1.3 添加配置"></a>1.3 添加配置</h3><figure class="highlight yaml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">server:</span></span><br><span class="line"> <span class="attr">port:</span> <span class="number">8881</span> <span class="comment">#服务端口</span></span><br><span class="line"><span class="attr">spring:</span></span><br><span class="line"> <span class="attr">application:</span></span><br><span class="line"> <span class="attr">name:</span> <span class="string">freemarker-demo</span> <span class="comment">#指定服务名</span></span><br><span class="line"> <span class="attr">freemarker:</span></span><br><span class="line"> <span class="attr">cache:</span> <span class="literal">false</span> <span class="comment">#关闭模板缓存，方便测试</span></span><br><span class="line"> <span class="attr">settings:</span></span><br><span class="line"> <span class="attr">template_update_delay:</span> <span class="number">0</span> <span class="comment">#检查模板更新延迟时间，设置为0表示立即检查，如果时间大于0会有缓存不方便进行模板测试</span></span><br><span class="line"> <span class="attr">suffix:</span> <span class="string">.ftl</span> <span class="comment">#指定Freemarker模板文件的后缀名,通常都是以ftl作为扩展名,也可以为html、xml、jsp等!</span></span><br></pre></td></tr></table></figure>
|
||
|
||
<h3 id="1-4-创建模板"><a href="#1-4-创建模板" class="headerlink" title="1.4 创建模板"></a>1.4 创建模板</h3><p>在resources下创建<strong>templates</strong>，此目录为freemarker的默认模板存放目录</p>
|
||
<p><img src="/pictures/image-20230816150936881.png" alt="image-20230816150936881"></p>
|
||
<p>在templates下创建模板文件 01-basic.ftl ，模板中的<strong>插值表达式</strong>最终会被freemarker替换成具体的数据</p>
|
||
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta"><!DOCTYPE <span class="keyword">html</span>></span></span><br><span class="line"><span class="tag"><<span class="name">html</span>></span></span><br><span class="line"><span class="tag"><<span class="name">head</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"utf-8"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">title</span>></span>Hello World!<span class="tag"></<span class="name">title</span>></span></span><br><span class="line"><span class="tag"></<span class="name">head</span>></span></span><br><span class="line"><span class="tag"><<span class="name">body</span>></span></span><br><span class="line"><span class="tag"><<span class="name">b</span>></span>普通文本 String 展示：<span class="tag"></<span class="name">b</span>></span><span class="tag"><<span class="name">br</span>></span><span class="tag"><<span class="name">br</span>></span></span><br><span class="line">Hello ${name} <span class="tag"><<span class="name">br</span>></span></span><br><span class="line"><span class="tag"><<span class="name">hr</span>></span></span><br><span class="line"><span class="tag"><<span class="name">b</span>></span>对象Student中的数据展示：<span class="tag"></<span class="name">b</span>></span><span class="tag"><<span class="name">br</span>/></span></span><br><span class="line">姓名：${stu.name}<span class="tag"><<span class="name">br</span>/></span></span><br><span class="line">年龄：${stu.age}</span><br><span class="line"><span class="tag"><<span class="name">hr</span>></span></span><br><span class="line"><span class="tag"></<span class="name">body</span>></span></span><br><span class="line"><span class="tag"></<span class="name">html</span>></span></span><br></pre></td></tr></table></figure>
|
||
|
||
<h3 id="1-5-创建启动类和模型类"><a href="#1-5-创建启动类和模型类" class="headerlink" title="1.5 创建启动类和模型类"></a>1.5 创建启动类和模型类</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.heima.freemarker;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.springframework.boot.SpringApplication;</span><br><span class="line"><span class="keyword">import</span> org.springframework.boot.autoconfigure.SpringBootApplication;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> Jason Gong</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span> 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span> https://jasonsgong.gitee.io</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Date</span> 2023/8/16</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Description</span></span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@SpringBootApplication</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">FreeMarkerDemoApplication</span> {</span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title function_">main</span><span class="params">(String[] args)</span> {</span><br><span class="line"> SpringApplication.run(FreeMarkerDemoApplication.class,args);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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||
|
||
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.heima.freemarker.entity;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> lombok.Data;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.util.Date;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> Jason Gong</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span> 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span> https://jasonsgong.gitee.io</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Date</span> 2023/8/16</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Description</span></span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Data</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">Student</span> {</span><br><span class="line"> <span class="keyword">private</span> String name;<span class="comment">//姓名</span></span><br><span class="line"> <span class="keyword">private</span> <span class="type">int</span> age;<span class="comment">//年龄</span></span><br><span class="line"> <span class="keyword">private</span> Date birthday;<span class="comment">//生日</span></span><br><span class="line"> <span class="keyword">private</span> Float money;<span class="comment">//钱包</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure>
|
||
|
||
<h3 id="1-6-创建Controller"><a href="#1-6-创建Controller" class="headerlink" title="1.6 创建Controller"></a>1.6 创建Controller</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.heima.freemarker.controller;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> com.heima.freemarker.entity.Student;</span><br><span class="line"><span class="keyword">import</span> org.springframework.stereotype.Controller;</span><br><span class="line"><span class="keyword">import</span> org.springframework.ui.Model;</span><br><span class="line"><span class="keyword">import</span> org.springframework.web.bind.annotation.GetMapping;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> Jason Gong</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span> 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span> https://jasonsgong.gitee.io</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Date</span> 2023/8/16</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Description</span></span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Controller</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">HelloController</span> {</span><br><span class="line"></span><br><span class="line"> <span class="meta">@GetMapping("/basic")</span></span><br><span class="line"> <span class="keyword">public</span> String <span class="title function_">test</span><span class="params">(Model model)</span> {</span><br><span class="line"> <span class="comment">//1.纯文本形式的参数</span></span><br><span class="line"> model.addAttribute(<span class="string">"name"</span>, <span class="string">"freemarker"</span>);</span><br><span class="line"></span><br><span class="line"> <span class="comment">//2.实体类相关的参数</span></span><br><span class="line"> <span class="type">Student</span> <span class="variable">student</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">Student</span>();</span><br><span class="line"> student.setName(<span class="string">"小明"</span>);</span><br><span class="line"> student.setAge(<span class="number">18</span>);</span><br><span class="line"> model.addAttribute(<span class="string">"stu"</span>, student);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> <span class="string">"01-basic"</span>;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
|
||
|
||
<h3 id="1-7-测试访问"><a href="#1-7-测试访问" class="headerlink" title="1.7 测试访问"></a>1.7 测试访问</h3><p>访问 <a target="_blank" rel="noopener" href="http://localhost:8881/basic">http://localhost:8881/basic</a></p>
|
||
<p><img src="/pictures/image-20230816152750639.png" alt="image-20230816152750639"></p>
|
||
<h1 id="三-FreeMarker语法基础"><a href="#三-FreeMarker语法基础" class="headerlink" title="三.FreeMarker语法基础"></a>三.FreeMarker语法基础</h1><h2 id="1-基础语法种类"><a href="#1-基础语法种类" class="headerlink" title="1.基础语法种类"></a>1.基础语法种类</h2><p> 1、注释，即<#– –>，介于其之间的内容会被freemarker忽略</p>
|
||
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><#--我是一个freemarker注释--></span><br></pre></td></tr></table></figure>
|
||
|
||
<p> 2、插值（Interpolation）：即 <strong><code>${..}</code></strong> 部分,freemarker会用真实的值代替**<code>${..}</code>**</p>
|
||
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">Hello ${name}</span><br></pre></td></tr></table></figure>
|
||
|
||
<p> 3、FTL指令：和HTML标记类似，名字前加#予以区分，Freemarker会解析标签中的表达式或逻辑。</p>
|
||
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><# >FTL指令</#> </span><br></pre></td></tr></table></figure>
|
||
|
||
<p> 4、文本，仅文本信息，这些不是freemarker的注释、插值、FTL指令的内容会被freemarker忽略解析，直接输出内容。</p>
|
||
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><#--freemarker中的普通文本--></span><br><span class="line">我是一个普通的文本</span><br></pre></td></tr></table></figure>
|
||
|
||
<h2 id="2-集合指令"><a href="#2-集合指令" class="headerlink" title="2.集合指令"></a>2.集合指令</h2><p><img src="/pictures/image-20230816170028648.png" alt="image-20230816170028648"></p>
|
||
<p><img src="/pictures/image-20230816170704421.png" alt="image-20230816170704421"></p>
|
||
<p>1、数据模型：</p>
|
||
<p>在HelloController中新增如下方法：</p>
|
||
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@GetMapping("/list")</span></span><br><span class="line"><span class="keyword">public</span> String <span class="title function_">list</span><span class="params">(Model model)</span>{</span><br><span class="line"></span><br><span class="line"> <span class="comment">//------------------------------------</span></span><br><span class="line"> <span class="type">Student</span> <span class="variable">stu1</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">Student</span>();</span><br><span class="line"> stu1.setName(<span class="string">"小强"</span>);</span><br><span class="line"> stu1.setAge(<span class="number">18</span>);</span><br><span class="line"> stu1.setMoney(<span class="number">1000.86f</span>);</span><br><span class="line"> stu1.setBirthday(<span class="keyword">new</span> <span class="title class_">Date</span>());</span><br><span class="line"></span><br><span class="line"> <span class="comment">//小红对象模型数据</span></span><br><span class="line"> <span class="type">Student</span> <span class="variable">stu2</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">Student</span>();</span><br><span class="line"> stu2.setName(<span class="string">"小红"</span>);</span><br><span class="line"> stu2.setMoney(<span class="number">200.1f</span>);</span><br><span class="line"> stu2.setAge(<span class="number">19</span>);</span><br><span class="line"></span><br><span class="line"> <span class="comment">//将两个对象模型数据存放到List集合中</span></span><br><span class="line"> List<Student> stus = <span class="keyword">new</span> <span class="title class_">ArrayList</span><>();</span><br><span class="line"> stus.add(stu1);</span><br><span class="line"> stus.add(stu2);</span><br><span class="line"></span><br><span class="line"> <span class="comment">//向model中存放List集合数据</span></span><br><span class="line"> model.addAttribute(<span class="string">"stus"</span>,stus);</span><br><span class="line"></span><br><span class="line"> <span class="comment">//------------------------------------</span></span><br><span class="line"></span><br><span class="line"> <span class="comment">//创建Map数据</span></span><br><span class="line"> HashMap<String,Student> stuMap = <span class="keyword">new</span> <span class="title class_">HashMap</span><>();</span><br><span class="line"> stuMap.put(<span class="string">"stu1"</span>,stu1);</span><br><span class="line"> stuMap.put(<span class="string">"stu2"</span>,stu2);</span><br><span class="line"> <span class="comment">// 3.1 向model中存放Map数据</span></span><br><span class="line"> model.addAttribute(<span class="string">"stuMap"</span>, stuMap);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> <span class="string">"02-list"</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
|
||
|
||
<p>2、模板：</p>
|
||
<p>在templates中新增<code>02-list.ftl</code>文件</p>
|
||
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta"><!DOCTYPE <span class="keyword">html</span>></span></span><br><span class="line"><span class="tag"><<span class="name">html</span>></span></span><br><span class="line"><span class="tag"><<span class="name">head</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"utf-8"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">title</span>></span>Hello World!<span class="tag"></<span class="name">title</span>></span></span><br><span class="line"><span class="tag"></<span class="name">head</span>></span></span><br><span class="line"><span class="tag"><<span class="name">body</span>></span></span><br><span class="line"> </span><br><span class="line"><#-- list 数据的展示 --></span><br><span class="line"><span class="tag"><<span class="name">b</span>></span>展示list中的stu数据:<span class="tag"></<span class="name">b</span>></span></span><br><span class="line"><span class="tag"><<span class="name">br</span>></span></span><br><span class="line"><span class="tag"><<span class="name">br</span>></span></span><br><span class="line"><span class="tag"><<span class="name">table</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">tr</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>序号<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>姓名<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>年龄<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>钱包<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">tr</span>></span></span><br><span class="line"><span class="tag"></<span class="name">table</span>></span></span><br><span class="line"><span class="tag"><<span class="name">hr</span>></span></span><br><span class="line"> </span><br><span class="line"><#-- Map 数据的展示 --></span><br><span class="line"><span class="tag"><<span class="name">b</span>></span>map数据的展示：<span class="tag"></<span class="name">b</span>></span></span><br><span class="line"><span class="tag"><<span class="name">br</span>/></span><span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"><span class="tag"><<span class="name">a</span> <span class="attr">href</span>=<span class="string">"###"</span>></span>方式一：通过map['keyname'].property<span class="tag"></<span class="name">a</span>></span><span class="tag"><<span class="name">br</span>/></span></span><br><span class="line">输出stu1的学生信息：<span class="tag"><<span class="name">br</span>/></span></span><br><span class="line">姓名：<span class="tag"><<span class="name">br</span>/></span></span><br><span class="line">年龄：<span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"><span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"><span class="tag"><<span class="name">a</span> <span class="attr">href</span>=<span class="string">"###"</span>></span>方式二：通过map.keyname.property<span class="tag"></<span class="name">a</span>></span><span class="tag"><<span class="name">br</span>/></span></span><br><span class="line">输出stu2的学生信息：<span class="tag"><<span class="name">br</span>/></span></span><br><span class="line">姓名：<span class="tag"><<span class="name">br</span>/></span></span><br><span class="line">年龄：<span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"></span><br><span class="line"><span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"><span class="tag"><<span class="name">a</span> <span class="attr">href</span>=<span class="string">"###"</span>></span>遍历map中两个学生信息：<span class="tag"></<span class="name">a</span>></span><span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"><span class="tag"><<span class="name">table</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">tr</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>序号<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>姓名<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>年龄<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>钱包<span class="tag"></<span class="name">td</span>></span> </span><br><span class="line"> <span class="tag"></<span class="name">tr</span>></span></span><br><span class="line"><span class="tag"></<span class="name">table</span>></span></span><br><span class="line"><span class="tag"><<span class="name">hr</span>></span></span><br><span class="line"> </span><br><span class="line"><span class="tag"></<span class="name">body</span>></span></span><br><span class="line"><span class="tag"></<span class="name">html</span>></span></span><br></pre></td></tr></table></figure>
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||
|
||
<p>实例代码：</p>
|
||
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta"><!DOCTYPE <span class="keyword">html</span>></span></span><br><span class="line"><span class="tag"><<span class="name">html</span>></span></span><br><span class="line"><span class="tag"><<span class="name">head</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"utf-8"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">title</span>></span>Hello World!<span class="tag"></<span class="name">title</span>></span></span><br><span class="line"><span class="tag"></<span class="name">head</span>></span></span><br><span class="line"><span class="tag"><<span class="name">body</span>></span></span><br><span class="line"> </span><br><span class="line"><#-- list 数据的展示 --></span><br><span class="line"><span class="tag"><<span class="name">b</span>></span>展示list中的stu数据:<span class="tag"></<span class="name">b</span>></span></span><br><span class="line"><span class="tag"><<span class="name">br</span>></span></span><br><span class="line"><span class="tag"><<span class="name">br</span>></span></span><br><span class="line"><span class="tag"><<span class="name">table</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">tr</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>序号<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>姓名<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>年龄<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>钱包<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">tr</span>></span></span><br><span class="line"> <#list stus as stu></span><br><span class="line"> <span class="tag"><<span class="name">tr</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>${stu_index+1}<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>${stu.name}<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>${stu.age}<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>${stu.money}<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">tr</span>></span></span><br><span class="line"> </#list></span><br><span class="line"></span><br><span class="line"><span class="tag"></<span class="name">table</span>></span></span><br><span class="line"><span class="tag"><<span class="name">hr</span>></span></span><br><span class="line"> </span><br><span class="line"><#-- Map 数据的展示 --></span><br><span class="line"><span class="tag"><<span class="name">b</span>></span>map数据的展示：<span class="tag"></<span class="name">b</span>></span></span><br><span class="line"><span class="tag"><<span class="name">br</span>/></span><span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"><span class="tag"><<span class="name">a</span> <span class="attr">href</span>=<span class="string">"###"</span>></span>方式一：通过map['keyname'].property<span class="tag"></<span class="name">a</span>></span><span class="tag"><<span class="name">br</span>/></span></span><br><span class="line">输出stu1的学生信息：<span class="tag"><<span class="name">br</span>/></span></span><br><span class="line">姓名：${stuMap['stu1'].name}<span class="tag"><<span class="name">br</span>/></span></span><br><span class="line">年龄：${stuMap['stu1'].age}<span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"><span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"><span class="tag"><<span class="name">a</span> <span class="attr">href</span>=<span class="string">"###"</span>></span>方式二：通过map.keyname.property<span class="tag"></<span class="name">a</span>></span><span class="tag"><<span class="name">br</span>/></span></span><br><span class="line">输出stu2的学生信息：<span class="tag"><<span class="name">br</span>/></span></span><br><span class="line">姓名：${stuMap.stu2.name}<span class="tag"><<span class="name">br</span>/></span></span><br><span class="line">年龄：${stuMap.stu2.age}<span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"></span><br><span class="line"><span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"><span class="tag"><<span class="name">a</span> <span class="attr">href</span>=<span class="string">"###"</span>></span>遍历map中两个学生信息：<span class="tag"></<span class="name">a</span>></span><span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"><span class="tag"><<span class="name">table</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">tr</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>序号<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>姓名<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>年龄<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>钱包<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">tr</span>></span></span><br><span class="line"> <#list stuMap?keys as key ></span><br><span class="line"> <span class="tag"><<span class="name">tr</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>${key_index}<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>${stuMap[key].name}<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>${stuMap[key].age}<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">td</span>></span>${stuMap[key].money}<span class="tag"></<span class="name">td</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">tr</span>></span></span><br><span class="line"> </#list></span><br><span class="line"><span class="tag"></<span class="name">table</span>></span></span><br><span class="line"><span class="tag"><<span class="name">hr</span>></span></span><br><span class="line"> </span><br><span class="line"><span class="tag"></<span class="name">body</span>></span></span><br><span class="line"><span class="tag"></<span class="name">html</span>></span></span><br></pre></td></tr></table></figure>
|
||
|
||
<p>上面代码解释：</p>
|
||
<p>${k_index}：index：得到循环的下标，使用方法是在stu后边加”_index”，它的值是从0开始，${stu_index+1}下标从1开始</p>
|
||
<p>展示效果:</p>
|
||
<p><img src="/pictures/image-20230816170550343.png" alt="image-20230816170550343"></p>
|
||
<h2 id="3-if指令"><a href="#3-if指令" class="headerlink" title="3.if指令"></a>3.if指令</h2><p><img src="/pictures/image-20230816170909497.png" alt="image-20230816170909497"></p>
|
||
<p> if 指令即判断指令，是常用的FTL指令，freemarker在解析时遇到if会进行判断，条件为真则输出if中间的内容，否则跳过内容不再输出。</p>
|
||
<ul>
|
||
<li>指令格式</li>
|
||
</ul>
|
||
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><#if ><span class="tag"></<span class="name">if</span>></span></span><br></pre></td></tr></table></figure>
|
||
|
||
<p>1、数据模型：</p>
|
||
<p>使用list指令中测试数据模型，判断名称为小红的数据字体显示为红色。</p>
|
||
<p>2、模板：</p>
|
||
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><table></span><br><span class="line"> <tr></span><br><span class="line"> <td>姓名</td></span><br><span class="line"> <td>年龄</td></span><br><span class="line"> <td>钱包</td></span><br><span class="line"> </tr></span><br><span class="line"> <#list stus as stu></span><br><span class="line"> <tr></span><br><span class="line"> <td >${stu.name}</td></span><br><span class="line"> <td>${stu.age}</td></span><br><span class="line"> <td >${stu.mondy}</td></span><br><span class="line"> </tr></span><br><span class="line"> </#list></span><br><span class="line"></span><br><span class="line"></table></span><br></pre></td></tr></table></figure>
|
||
|
||
<p>实例代码：</p>
|
||
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><table></span><br><span class="line"> <tr></span><br><span class="line"> <td>姓名</td></span><br><span class="line"> <td>年龄</td></span><br><span class="line"> <td>钱包</td></span><br><span class="line"> </tr></span><br><span class="line"> <#list stus as stu ></span><br><span class="line"> <#if stu.name='小红'></span><br><span class="line"> <tr style="color: red"></span><br><span class="line"> <td>${stu_index}</td></span><br><span class="line"> <td>${stu.name}</td></span><br><span class="line"> <td>${stu.age}</td></span><br><span class="line"> <td>${stu.money}</td></span><br><span class="line"> </tr></span><br><span class="line"> <#else ></span><br><span class="line"> <tr></span><br><span class="line"> <td>${stu_index}</td></span><br><span class="line"> <td>${stu.name}</td></span><br><span class="line"> <td>${stu.age}</td></span><br><span class="line"> <td>${stu.money}</td></span><br><span class="line"> </tr></span><br><span class="line"> </#if></span><br><span class="line"> </#list></span><br><span class="line"></table></span><br></pre></td></tr></table></figure>
|
||
|
||
<p>3、输出：</p>
|
||
<p><img src="/pictures/image-20230816171119081.png" alt="image-20230816171119081"></p>
|
||
<h2 id="4-运算符"><a href="#4-运算符" class="headerlink" title="4.运算符"></a>4.运算符</h2><p><strong>1、算数运算符</strong></p>
|
||
<p>FreeMarker表达式中完全支持算术运算,FreeMarker支持的算术运算符包括:</p>
|
||
<ul>
|
||
<li>加法： <code>+</code></li>
|
||
<li>减法： <code>-</code></li>
|
||
<li>乘法： <code>*</code></li>
|
||
<li>除法： <code>/</code></li>
|
||
<li>求模 (求余)： <code>%</code></li>
|
||
</ul>
|
||
<p>模板代码</p>
|
||
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">b</span>></span>算数运算符<span class="tag"></<span class="name">b</span>></span></span><br><span class="line"><span class="tag"><<span class="name">br</span>/></span><span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"> 100+5 运算： ${100 + 5 }<span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"> 100 - 5 * 5运算：${100 - 5 * 5}<span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"> 5 / 2运算：${5 / 2}<span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"> 12 % 10运算：${12 % 10}<span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"><span class="tag"><<span class="name">hr</span>></span></span><br></pre></td></tr></table></figure>
|
||
|
||
<p>除了 + 运算以外，其他的运算只能和 number 数字类型的计算。</p>
|
||
<p><strong>2、比较运算符</strong></p>
|
||
<ul>
|
||
<li><strong><code>=</code><strong>或者</strong><code>==</code></strong>:判断两个值是否相等. </li>
|
||
<li><strong><code>!=</code></strong>:判断两个值是否不等. </li>
|
||
<li><strong><code>></code><strong>或者</strong><code>gt</code></strong>:判断左边值是否大于右边值 </li>
|
||
<li><strong><code>>=</code><strong>或者</strong><code>gte</code></strong>:判断左边值是否大于等于右边值 </li>
|
||
<li><strong><code><</code><strong>或者</strong><code>lt</code></strong>:判断左边值是否小于右边值 </li>
|
||
<li><strong><code><=</code><strong>或者</strong><code>lte</code></strong>:判断左边值是否小于等于右边值</li>
|
||
</ul>
|
||
<p>= 和 == 模板代码</p>
|
||
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta"><!DOCTYPE <span class="keyword">html</span>></span></span><br><span class="line"><span class="tag"><<span class="name">html</span>></span></span><br><span class="line"><span class="tag"><<span class="name">head</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"utf-8"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">title</span>></span>Hello World!<span class="tag"></<span class="name">title</span>></span></span><br><span class="line"><span class="tag"></<span class="name">head</span>></span></span><br><span class="line"><span class="tag"><<span class="name">body</span>></span></span><br><span class="line"></span><br><span class="line"> <span class="tag"><<span class="name">b</span>></span>比较运算符<span class="tag"></<span class="name">b</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"></span><br><span class="line"> <span class="tag"><<span class="name">dl</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">dt</span>></span> =/== 和 != 比较：<span class="tag"></<span class="name">dt</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">dd</span>></span></span><br><span class="line"> <#if "xiaoming" == "xiaoming"></span><br><span class="line"> 字符串的比较 "xiaoming" == "xiaoming"</span><br><span class="line"> </#if></span><br><span class="line"> <span class="tag"></<span class="name">dd</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">dd</span>></span></span><br><span class="line"> <#if 10 != 100></span><br><span class="line"> 数值的比较 10 != 100</span><br><span class="line"> </#if></span><br><span class="line"> <span class="tag"></<span class="name">dd</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">dl</span>></span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"> <span class="tag"><<span class="name">dl</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">dt</span>></span>其他比较<span class="tag"></<span class="name">dt</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">dd</span>></span></span><br><span class="line"> <#if 10 gt 5 ></span><br><span class="line"> 形式一：使用特殊字符比较数值 10 gt 5</span><br><span class="line"> </#if></span><br><span class="line"> <span class="tag"></<span class="name">dd</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">dd</span>></span></span><br><span class="line"> <#-- 日期的比较需要通过?date将属性转为data类型才能进行比较 --></span><br><span class="line"> <#if (date1?date >= date2?date)></span><br><span class="line"> 形式二：使用括号形式比较时间 date1?date >= date2?date</span><br><span class="line"> </#if></span><br><span class="line"> <span class="tag"></<span class="name">dd</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">dl</span>></span></span><br><span class="line"></span><br><span class="line"> <span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"><span class="tag"><<span class="name">hr</span>></span></span><br><span class="line"><span class="tag"></<span class="name">body</span>></span></span><br><span class="line"><span class="tag"></<span class="name">html</span>></span></span><br></pre></td></tr></table></figure>
|
||
|
||
<p>Controller 的 数据模型代码</p>
|
||
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@GetMapping("operation")</span></span><br><span class="line"><span class="keyword">public</span> String <span class="title function_">testOperation</span><span class="params">(Model model)</span> {</span><br><span class="line"> <span class="comment">//构建 Date 数据</span></span><br><span class="line"> <span class="type">Date</span> <span class="variable">now</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">Date</span>();</span><br><span class="line"> model.addAttribute(<span class="string">"date1"</span>, now);</span><br><span class="line"> model.addAttribute(<span class="string">"date2"</span>, now);</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">return</span> <span class="string">"03-operation"</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
|
||
|
||
<p><strong>比较运算符注意</strong></p>
|
||
<ul>
|
||
<li><code>=</code>和<code>!=</code>可以用于字符串、数值和日期来比较是否相等</li>
|
||
<li><code>=</code>和<code>!=</code>两边必须是相同类型的值,否则会产生错误</li>
|
||
<li>字符串 <code>"x"</code> 、<code>"x "</code> 、<code>"X"</code>比较是不等的.因为FreeMarker是精确比较</li>
|
||
<li>其它的运行符可以作用于数字和日期,但不能作用于字符串</li>
|
||
<li>使用<code>gt</code>等字母运算符代替<code>></code>会有更好的效果,因为 FreeMarker会把<code>></code>解释成FTL标签的结束字符</li>
|
||
<li>可以使用括号来避免这种情况,如:<code><#if (x>y)></code></li>
|
||
</ul>
|
||
<p><strong>3、逻辑运算符</strong></p>
|
||
<ul>
|
||
<li>逻辑与:&& </li>
|
||
<li>逻辑或:|| </li>
|
||
<li>逻辑非:!</li>
|
||
</ul>
|
||
<p>逻辑运算符只能作用于布尔值,否则将产生错误 。</p>
|
||
<p>模板代码</p>
|
||
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">b</span>></span>逻辑运算符<span class="tag"></<span class="name">b</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"> <#if (10 lt 12 )&&( 10 gt 5 ) ></span><br><span class="line"> (10 lt 12 )&&( 10 gt 5 ) 显示为 true</span><br><span class="line"> </#if></span><br><span class="line"> <span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"> <#if !false></span><br><span class="line"> false 取反为true</span><br><span class="line"> </#if></span><br><span class="line"><span class="tag"><<span class="name">hr</span>></span></span><br></pre></td></tr></table></figure>
|
||
|
||
<h2 id="5-空值处理"><a href="#5-空值处理" class="headerlink" title="5.空值处理"></a>5.空值处理</h2><p><strong>1、判断某变量是否存在使用 “??”</strong></p>
|
||
<p>用法为:variable??,如果该变量存在,返回true,否则返回false </p>
|
||
<p>例：为防止stus为空报错可以加上判断如下：</p>
|
||
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><#if stus??></span><br><span class="line"><#list stus as stu></span><br><span class="line"> ......</span><br><span class="line"></#list></span><br><span class="line"></#if></span><br></pre></td></tr></table></figure>
|
||
|
||
<p><strong>2、缺失变量默认值使用 “!”</strong></p>
|
||
<ul>
|
||
<li><p>使用!要以指定一个默认值，当变量为空时显示默认值</p>
|
||
<p>例： ${name!’’}表示如果name为空显示空字符串。</p>
|
||
</li>
|
||
<li><p>如果是嵌套对象则建议使用（）括起来</p>
|
||
<p>例： ${(stu.bestFriend.name)!’’}表示，如果stu或bestFriend或name为空默认显示空字符串。</p>
|
||
</li>
|
||
</ul>
|
||
<h2 id="6-内建函数"><a href="#6-内建函数" class="headerlink" title="6.内建函数"></a>6.内建函数</h2><p>内建函数语法格式： <strong><code>变量+?+函数名称</code></strong> </p>
|
||
<p><strong>1、某个集合的大小</strong></p>
|
||
<p><strong><code>${集合名?size}</code></strong></p>
|
||
<p><strong>2、日期格式化</strong></p>
|
||
<p>显示年月日: <code>${today?date}</code> </p>
|
||
<p>显示时分秒：<code>${today?time}</code> </p>
|
||
<p>显示日期+时间：<code>${today?datetime}</code> </p>
|
||
<p>自定义格式化： <code>${today?string("yyyy年MM月")}</code></p>
|
||
<p><strong>3、内建函数<code>c</code></strong></p>
|
||
<p>model.addAttribute(“point”, 102920122);</p>
|
||
<p>point是数字型，使用${point}会显示这个数字的值，每三位使用逗号分隔。</p>
|
||
<p>如果不想显示为每三位分隔的数字，可以使用c函数将数字型转成字符串输出</p>
|
||
<p><strong><code>${point?c}</code></strong></p>
|
||
<p><strong>4、将json字符串转成对象</strong></p>
|
||
<p>一个例子：</p>
|
||
<p>其中用到了 assign标签，assign的作用是定义一个变量。</p>
|
||
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><#assign text="{'bank':'工商银行','account':'10101920201920212'}" /></span><br><span class="line"><#assign data=text?eval /></span><br><span class="line">开户行：${data.bank} 账号：${data.account}</span><br></pre></td></tr></table></figure>
|
||
|
||
<p>模板代码：</p>
|
||
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta"><!DOCTYPE <span class="keyword">html</span>></span></span><br><span class="line"><span class="tag"><<span class="name">html</span>></span></span><br><span class="line"><span class="tag"><<span class="name">head</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"utf-8"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">title</span>></span>inner Function<span class="tag"></<span class="name">title</span>></span></span><br><span class="line"><span class="tag"></<span class="name">head</span>></span></span><br><span class="line"><span class="tag"><<span class="name">body</span>></span></span><br><span class="line"></span><br><span class="line"> <span class="tag"><<span class="name">b</span>></span>获得集合大小<span class="tag"></<span class="name">b</span>></span><span class="tag"><<span class="name">br</span>></span></span><br><span class="line"></span><br><span class="line"> 集合大小：</span><br><span class="line"> <span class="tag"><<span class="name">hr</span>></span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"> <span class="tag"><<span class="name">b</span>></span>获得日期<span class="tag"></<span class="name">b</span>></span><span class="tag"><<span class="name">br</span>></span></span><br><span class="line"></span><br><span class="line"> 显示年月日: <span class="tag"><<span class="name">br</span>></span></span><br><span class="line"></span><br><span class="line"> 显示时分秒：<span class="tag"><<span class="name">br</span>></span></span><br><span class="line"></span><br><span class="line"> 显示日期+时间：<span class="tag"><<span class="name">br</span>></span></span><br><span class="line"></span><br><span class="line"> 自定义格式化： <span class="tag"><<span class="name">br</span>></span></span><br><span class="line"></span><br><span class="line"> <span class="tag"><<span class="name">hr</span>></span></span><br><span class="line"></span><br><span class="line"> <span class="tag"><<span class="name">b</span>></span>内建函数C<span class="tag"></<span class="name">b</span>></span><span class="tag"><<span class="name">br</span>></span></span><br><span class="line"> 没有C函数显示的数值： <span class="tag"><<span class="name">br</span>></span></span><br><span class="line"></span><br><span class="line"> 有C函数显示的数值：</span><br><span class="line"></span><br><span class="line"> <span class="tag"><<span class="name">hr</span>></span></span><br><span class="line"></span><br><span class="line"> <span class="tag"><<span class="name">b</span>></span>声明变量assign<span class="tag"></<span class="name">b</span>></span><span class="tag"><<span class="name">br</span>></span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="tag"><<span class="name">hr</span>></span></span><br><span class="line"><span class="tag"></<span class="name">body</span>></span></span><br><span class="line"><span class="tag"></<span class="name">html</span>></span></span><br></pre></td></tr></table></figure>
|
||
|
||
<p>内建函数模板页面：</p>
|
||
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br></pre></td><td class="code"><pre><span class="line"><!DOCTYPE html></span><br><span class="line"><html></span><br><span class="line"><head></span><br><span class="line"> <meta charset="utf-8"></span><br><span class="line"> <title>inner Function</title></span><br><span class="line"></head></span><br><span class="line"><body></span><br><span class="line"></span><br><span class="line"> <b>获得集合大小</b><br></span><br><span class="line"></span><br><span class="line"> 集合大小：${stus?size}</span><br><span class="line"> <hr></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"> <b>获得日期</b><br></span><br><span class="line"></span><br><span class="line"> 显示年月日: ${today?date} <br></span><br><span class="line"></span><br><span class="line"> 显示时分秒：${today?time}<br></span><br><span class="line"></span><br><span class="line"> 显示日期+时间：${today?datetime}<br></span><br><span class="line"></span><br><span class="line"> 自定义格式化： ${today?string("yyyy年MM月")}<br></span><br><span class="line"></span><br><span class="line"> <hr></span><br><span class="line"></span><br><span class="line"> <b>内建函数C</b><br></span><br><span class="line"> 没有C函数显示的数值：${point} <br></span><br><span class="line"></span><br><span class="line"> 有C函数显示的数值：${point?c}</span><br><span class="line"></span><br><span class="line"> <hr></span><br><span class="line"></span><br><span class="line"> <b>声明变量assign</b><br></span><br><span class="line"> <#assign text="{'bank':'工商银行','account':'10101920201920212'}" /></span><br><span class="line"> <#assign data=text?eval /></span><br><span class="line"> 开户行：${data.bank} 账号：${data.account}</span><br><span class="line"></span><br><span class="line"><hr></span><br><span class="line"></body></span><br><span class="line"></html></span><br></pre></td></tr></table></figure>
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<p>内建函数Controller数据模型：</p>
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<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@GetMapping("innerFunc")</span></span><br><span class="line"><span class="keyword">public</span> String <span class="title function_">testInnerFunc</span><span class="params">(Model model)</span> {</span><br><span class="line"> <span class="comment">//1.1 小强对象模型数据</span></span><br><span class="line"> <span class="type">Student</span> <span class="variable">stu1</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">Student</span>();</span><br><span class="line"> stu1.setName(<span class="string">"小强"</span>);</span><br><span class="line"> stu1.setAge(<span class="number">18</span>);</span><br><span class="line"> stu1.setMoney(<span class="number">1000.86f</span>);</span><br><span class="line"> stu1.setBirthday(<span class="keyword">new</span> <span class="title class_">Date</span>());</span><br><span class="line"> <span class="comment">//1.2 小红对象模型数据</span></span><br><span class="line"> <span class="type">Student</span> <span class="variable">stu2</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">Student</span>();</span><br><span class="line"> stu2.setName(<span class="string">"小红"</span>);</span><br><span class="line"> stu2.setMoney(<span class="number">200.1f</span>);</span><br><span class="line"> stu2.setAge(<span class="number">19</span>);</span><br><span class="line"> <span class="comment">//1.3 将两个对象模型数据存放到List集合中</span></span><br><span class="line"> List<Student> stus = <span class="keyword">new</span> <span class="title class_">ArrayList</span><>();</span><br><span class="line"> stus.add(stu1);</span><br><span class="line"> stus.add(stu2);</span><br><span class="line"> model.addAttribute(<span class="string">"stus"</span>, stus);</span><br><span class="line"> <span class="comment">// 2.1 添加日期</span></span><br><span class="line"> <span class="type">Date</span> <span class="variable">date</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">Date</span>();</span><br><span class="line"> model.addAttribute(<span class="string">"today"</span>, date);</span><br><span class="line"> <span class="comment">// 3.1 添加数值</span></span><br><span class="line"> model.addAttribute(<span class="string">"point"</span>, <span class="number">102920122</span>);</span><br><span class="line"> <span class="keyword">return</span> <span class="string">"04-innerFunc"</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<h1 id="四-静态化测试"><a href="#四-静态化测试" class="headerlink" title="四.静态化测试"></a>四.静态化测试</h1><h2 id="1-思路分析"><a href="#1-思路分析" class="headerlink" title="1.思路分析"></a>1.思路分析</h2><p><img src="/pictures/image-20230816172633599.png" alt="image-20230816172633599"></p>
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<h2 id="2-实现步骤"><a href="#2-实现步骤" class="headerlink" title="2.实现步骤"></a>2.实现步骤</h2><p><strong>根据模板文件生成html文件</strong></p>
|
||
<p>①：修改application.yml文件，添加以下模板存放位置的配置信息，完整配置如下：</p>
|
||
<figure class="highlight yaml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">server:</span></span><br><span class="line"> <span class="attr">port:</span> <span class="number">8881</span> <span class="comment">#服务端口</span></span><br><span class="line"><span class="attr">spring:</span></span><br><span class="line"> <span class="attr">application:</span></span><br><span class="line"> <span class="attr">name:</span> <span class="string">freemarker-demo</span> <span class="comment">#指定服务名</span></span><br><span class="line"> <span class="attr">freemarker:</span></span><br><span class="line"> <span class="attr">cache:</span> <span class="literal">false</span> <span class="comment">#关闭模板缓存，方便测试</span></span><br><span class="line"> <span class="attr">settings:</span></span><br><span class="line"> <span class="attr">template_update_delay:</span> <span class="number">0</span> <span class="comment">#检查模板更新延迟时间，设置为0表示立即检查，如果时间大于0会有缓存不方便进行模板测试</span></span><br><span class="line"> <span class="attr">suffix:</span> <span class="string">.ftl</span> <span class="comment">#指定Freemarker模板文件的后缀名</span></span><br><span class="line"> <span class="attr">template-loader-path:</span> <span class="string">classpath:/templates</span> <span class="comment">#模板存放位置</span></span><br></pre></td></tr></table></figure>
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|
||
<p>②：在test下创建测试类</p>
|
||
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.heima.freemarker.test;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> com.heima.freemarker.FreeMarkerDemoApplication;</span><br><span class="line"><span class="keyword">import</span> com.heima.freemarker.entity.Student;</span><br><span class="line"><span class="keyword">import</span> freemarker.template.Configuration;</span><br><span class="line"><span class="keyword">import</span> freemarker.template.Template;</span><br><span class="line"><span class="keyword">import</span> freemarker.template.TemplateException;</span><br><span class="line"><span class="keyword">import</span> org.junit.Test;</span><br><span class="line"><span class="keyword">import</span> org.junit.runner.RunWith;</span><br><span class="line"><span class="keyword">import</span> org.springframework.beans.factory.annotation.Autowired;</span><br><span class="line"><span class="keyword">import</span> org.springframework.boot.test.context.SpringBootTest;</span><br><span class="line"><span class="keyword">import</span> org.springframework.test.context.junit4.SpringRunner;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.io.FileWriter;</span><br><span class="line"><span class="keyword">import</span> java.io.IOException;</span><br><span class="line"><span class="keyword">import</span> java.util.HashMap;</span><br><span class="line"><span class="keyword">import</span> java.util.Map;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> Jason Gong</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span> 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span> https://jasonsgong.gitee.io</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Date</span> 2023/8/16</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Description</span></span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@SpringBootTest(classes = FreeMarkerDemoApplication.class)</span></span><br><span class="line"><span class="meta">@RunWith(SpringRunner.class)</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">FreeMarkerTest</span> {</span><br><span class="line"> <span class="meta">@Autowired</span></span><br><span class="line"> <span class="comment">//freemarker.template.Configuration</span></span><br><span class="line"> <span class="keyword">private</span> Configuration configuration;</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Test</span></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">test</span><span class="params">()</span> <span class="keyword">throws</span> IOException, TemplateException {</span><br><span class="line"> <span class="type">Template</span> <span class="variable">template</span> <span class="operator">=</span> configuration.getTemplate(<span class="string">"01-basic.ftl"</span>);</span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 第一个参数:数据模型</span></span><br><span class="line"><span class="comment"> * 第二个参数:输出流</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> template.process(getData(),<span class="keyword">new</span> <span class="title class_">FileWriter</span>(<span class="string">"C:\\Gong\\data\\test.html"</span>));</span><br><span class="line"></span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 构建数据模型</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">private</span> Map<String,Object> <span class="title function_">getData</span><span class="params">()</span>{</span><br><span class="line"> HashMap<String, Object> map = <span class="keyword">new</span> <span class="title class_">HashMap</span><>();</span><br><span class="line"> <span class="comment">//1.纯文本形式的参数</span></span><br><span class="line"> map.put(<span class="string">"name"</span>, <span class="string">"freemarker"</span>);</span><br><span class="line"> <span class="comment">//2.实体类相关的参数</span></span><br><span class="line"> <span class="type">Student</span> <span class="variable">student</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">Student</span>();</span><br><span class="line"> student.setName(<span class="string">"小明"</span>);</span><br><span class="line"> student.setAge(<span class="number">18</span>);</span><br><span class="line"> map.put(<span class="string">"stu"</span>, student);</span><br><span class="line"> <span class="keyword">return</span> map;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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||
|
||
<p> ③ :运行结果</p>
|
||
<p><img src="/pictures/image-20230816174550953.png" alt="image-20230816174550953"></p>
|
||
</article><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" href="/tags/FreeMarker/">FreeMarker</a></div><div class="post_share"><div class="social-share" data-image="/img/2.png" data-sites="wechat,weibo,qq"></div><link rel="stylesheet" href="/cdn/css/share.min.css" media="print" onload="this.media='all'"><script src="/cdn/js/social-share.min.js" defer></script></div></div><div class="post-reward"><div class="reward-button"><i class="fas fa-qrcode"></i> 打赏</div><div class="reward-main"><ul class="reward-all"><li class="reward-item"><a href="/img/wechat.jpg" target="_blank"><img class="post-qr-code-img" src="/img/wechat.jpg" alt="微信"/></a><div class="post-qr-code-desc">微信</div></li><li class="reward-item"><a href="/img/alipay.jpg" target="_blank"><img class="post-qr-code-img" src="/img/alipay.jpg" alt="支付宝"/></a><div class="post-qr-code-desc">支付宝</div></li></ul></div></div><br/><div id="post-comment"><div class="comment-head"><div class="comment-headline"><i class="far fa-comment-alt fa-fw"></i><span> 评论</span></div></div><div class="comment-wrap"><div><div id="gitalk-container"></div></div></div></div></div><div class="aside-content" id="aside-content"><div class="card-widget card-info"><div class="is-center"><div class="avatar-img"><img src="/img/avatar.jpg" onerror="this.onerror=null;this.src='/img/loading.gif'" alt="avatar"/></div><div class="author-info__name">Jason</div><div class="author-info__description">Debug the World！</div></div><div class="card-info-data site-data is-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">61</div></a><a href="/tags/"><div class="headline">标签</div><div class="length-num">39</div></a><a href="/categories/"><div class="headline">分类</div><div class="length-num">10</div></a></div><a id="card-info-btn"><i class="fab fa-microsoft"></i><span>Ctrl + D 收藏</span></a><div class="card-info-social-icons is-center"><a class="social-icon" href="https://github.com/JasonsGong" target="_blank" title="Github"><i class="fab fa-github"></i></a><a class="social-icon" href="tencent://AddContact/?fromId=45&fromSubId=1&subcmd=all&uin=2602183349&website=www.oicqzone.com" target="_blank" title="QQ"><i class="fab fa-qq"></i></a><a class="social-icon" href="mailto:2602183349@qq.com" target="_blank" title="Email"><i class="fas fa-envelope-open-text"></i></a><a class="social-icon" href="https://github.com/JasonsGong?tab=repositories" target="_blank" title="代码仓库"><i class="fas fa-database"></i></a></div></div><div class="card-widget card-announcement"><div class="item-headline"><i class="fas fa-bullhorn fa-shake"></i><span>公告</span></div><div class="announcement_content">本网站是静态网站,更新页面资源请使用Ctrl+F5;若网站内文章对你有帮助,请使用Ctrl+D收藏该网站！</div></div><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="item-headline"><i class="fas fa-stream"></i><span>目录</span><span class="toc-percentage"></span></div><div class="toc-content is-expand"><ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#%E4%B8%80-FreeMarker%E4%BB%8B%E7%BB%8D"><span class="toc-text">一.FreeMarker介绍</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#%E4%BA%8C-%E5%BF%AB%E9%80%9F%E5%85%A5%E9%97%A8"><span class="toc-text">二.快速入门</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#1-%E7%8E%AF%E5%A2%83%E6%90%AD%E5%BB%BA"><span class="toc-text">1.环境搭建</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#1-1-%E5%88%9B%E5%BB%BA%E4%B8%80%E4%B8%AAdemo%E5%B7%A5%E7%A8%8B"><span class="toc-text">1.1 创建一个demo工程</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#1-2-%E5%BC%95%E5%85%A5%E4%BE%9D%E8%B5%96"><span class="toc-text">1.2 引入依赖</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#1-3-%E6%B7%BB%E5%8A%A0%E9%85%8D%E7%BD%AE"><span class="toc-text">1.3 添加配置</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#1-4-%E5%88%9B%E5%BB%BA%E6%A8%A1%E6%9D%BF"><span class="toc-text">1.4 创建模板</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#1-5-%E5%88%9B%E5%BB%BA%E5%90%AF%E5%8A%A8%E7%B1%BB%E5%92%8C%E6%A8%A1%E5%9E%8B%E7%B1%BB"><span class="toc-text">1.5 创建启动类和模型类</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#1-6-%E5%88%9B%E5%BB%BAController"><span class="toc-text">1.6 创建Controller</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#1-7-%E6%B5%8B%E8%AF%95%E8%AE%BF%E9%97%AE"><span class="toc-text">1.7 测试访问</span></a></li></ol></li></ol></li><li class="toc-item toc-level-1"><a class="toc-link" href="#%E4%B8%89-FreeMarker%E8%AF%AD%E6%B3%95%E5%9F%BA%E7%A1%80"><span class="toc-text">三.FreeMarker语法基础</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#1-%E5%9F%BA%E7%A1%80%E8%AF%AD%E6%B3%95%E7%A7%8D%E7%B1%BB"><span class="toc-text">1.基础语法种类</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#2-%E9%9B%86%E5%90%88%E6%8C%87%E4%BB%A4"><span class="toc-text">2.集合指令</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#3-if%E6%8C%87%E4%BB%A4"><span class="toc-text">3.if指令</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#4-%E8%BF%90%E7%AE%97%E7%AC%A6"><span class="toc-text">4.运算符</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#5-%E7%A9%BA%E5%80%BC%E5%A4%84%E7%90%86"><span class="toc-text">5.空值处理</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#6-%E5%86%85%E5%BB%BA%E5%87%BD%E6%95%B0"><span class="toc-text">6.内建函数</span></a></li></ol></li><li class="toc-item toc-level-1"><a class="toc-link" href="#%E5%9B%9B-%E9%9D%99%E6%80%81%E5%8C%96%E6%B5%8B%E8%AF%95"><span class="toc-text">四.静态化测试</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#1-%E6%80%9D%E8%B7%AF%E5%88%86%E6%9E%90"><span class="toc-text">1.思路分析</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#2-%E5%AE%9E%E7%8E%B0%E6%AD%A5%E9%AA%A4"><span class="toc-text">2.实现步骤</span></a></li></ol></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最近更新</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/posts/46317.html" title="面试专题"><img src="/img/1.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="面试专题"/></a><div class="content"><a class="title" href="/posts/46317.html" title="面试专题">面试专题</a><time datetime="2024-04-02T05:34:50.703Z" title="更新于 2024-04-02 13:34:50">2024-04-02</time></div></div><div class="aside-list-item"><a class="thumbnail" href="/posts/14438.html" title="常见问题和细节知识"><img src="/img/2.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="常见问题和细节知识"/></a><div class="content"><a class="title" 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