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<meta property="og:description" content="一.常见问题1.前后端时间格式的问题配置文件中设置时间的格式和时区 2.MyBatis分页插件统计总记录数total失效的问题检查一下分页插件的配置 选择以下正确的分页插件配置 1234567891011121314151617181920212223242526272829303132package com.atguigu.common.config.mp;import com.baomid">
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<p><img src="/pictures/image-20230506130238222.png" alt="image-20230506130238222"></p>
<h2 id="2-MyBatis分页插件统计总记录数total失效的问题"><a href="#2-MyBatis分页插件统计总记录数total失效的问题" class="headerlink" title="2.MyBatis分页插件统计总记录数total失效的问题"></a>2.MyBatis分页插件统计总记录数total失效的问题</h2><p>检查一下分页插件的配置 选择以下正确的分页插件配置</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></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.atguigu.common.config.mp;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> com.baomidou.mybatisplus.annotation.DbType;</span><br><span class="line"><span class="keyword">import</span> com.baomidou.mybatisplus.autoconfigure.ConfigurationCustomizer;</span><br><span class="line"><span class="keyword">import</span> com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;</span><br><span class="line"><span class="keyword">import</span> com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;</span><br><span class="line"><span class="keyword">import</span> org.mybatis.spring.annotation.MapperScan;</span><br><span class="line"><span class="keyword">import</span> org.springframework.context.annotation.Bean;</span><br><span class="line"><span class="keyword">import</span> org.springframework.context.annotation.Configuration;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * mp的分页插件</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Configuration</span></span><br><span class="line"><span class="meta">@MapperScan(&quot;com.atguigu.auth.mapper&quot;)</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">MybatisPlusConfig</span> &#123;</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 新的分页插件,一缓和二缓遵循mybatis的规则,需要设置 MybatisConfiguration#useDeprecatedExecutor = false 避免缓存出现问题(该属性会在旧插件移除后一同移除)</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="meta">@Bean</span></span><br><span class="line"> <span class="keyword">public</span> MybatisPlusInterceptor <span class="title function_">mybatisPlusInterceptor</span><span class="params">()</span> &#123;</span><br><span class="line"> <span class="type">MybatisPlusInterceptor</span> <span class="variable">interceptor</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">MybatisPlusInterceptor</span>();</span><br><span class="line"> interceptor.addInnerInterceptor(<span class="keyword">new</span> <span class="title class_">PaginationInnerInterceptor</span>(DbType.MYSQL));</span><br><span class="line"> <span class="keyword">return</span> interceptor;</span><br><span class="line"> &#125;</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Bean</span></span><br><span class="line"> <span class="keyword">public</span> ConfigurationCustomizer <span class="title function_">c
<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></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.atguigu.config;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> com.baomidou.mybatisplus.core.injector.ISqlInjector;</span><br><span class="line"><span class="keyword">import</span> com.baomidou.mybatisplus.extension.injector.LogicSqlInjector;</span><br><span class="line"><span class="keyword">import</span> com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;</span><br><span class="line"><span class="keyword">import</span> org.springframework.context.annotation.Bean;</span><br><span class="line"><span class="keyword">import</span> org.springframework.context.annotation.Configuration;</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> GongChangjiang</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">@Date</span> 2023/3/4</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Description</span> mybatis-plus的配置文件</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Configuration</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">MpConfig</span> &#123;</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 分页插件</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="meta">@Bean</span></span><br><span class="line"> <span class="keyword">public</span> PaginationInterceptor <span class="title function_">paginationInterceptor</span><span class="params">()</span>&#123;</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">new</span> <span class="title class_">PaginationInterceptor</span>();</span><br><span class="line"> &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<h2 id="3-网关中的路由问题"><a href="#3-网关中的路由问题" class="headerlink" title="3.网关中的路由问题"></a>3.网关中的路由问题</h2><p>网关中的路由匹配问题,模糊的路由放在精确的路由前面,容易是精确的路由配置失效</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><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></pre></td><td class="code"><pre><span class="line"><span class="attr">spring:</span></span><br><span class="line"> <span class="attr">cloud:</span></span><br><span class="line"> <span class="attr">gateway:</span></span><br><span class="line"> <span class="attr">routes:</span></span><br><span class="line"> <span class="comment">#这个是精确的路由,下面的路由在前,特定的请求就不会转发到这个请求中来</span></span><br><span class="line"> <span class="bullet">-</span> <span class="attr">id:</span> <span class="string">product_route</span></span><br><span class="line"> <span class="attr">uri:</span> <span class="string">lb://gulimall-product</span></span><br><span class="line"> <span class="attr">predicates:</span></span><br><span class="line"> <span class="bullet">-</span> <span class="string">Path=/api/product/**</span></span><br><span class="line"> <span class="attr">filters:</span></span><br><span class="line"> <span class="bullet">-</span> <span class="string">RewritePath=/api/(?&lt;segment&gt;.*),/$\&#123;segment&#125;</span></span><br><span class="line"> </span><br><span class="line"> <span class="comment">#这个是模糊的路由,如果放在上面的那个路由配置的前面,会导致上面的那个路由配置失效</span></span><br><span class="line"> <span class="bullet">-</span> <span class="attr">id:</span> <span class="string">admin_route</span> </span><br><span class="line"> <span class="attr">uri:</span> <span class="string">lb://renren-fast</span></span><br><span class="line"> <span class="attr">predicates:</span></span><br><span class="line"> <span class="bullet">-</span> <span class="string">Path=/api/**</span></span><br><span class="line"> <span class="attr">filters:</span></span><br><span class="line"> <span class="bullet">-</span> <span class="string">RewritePath=/api/(?&lt;segment&gt;.*),/renren-fast/$\&#123;segment&#125;</span></span><br></pre></td></tr></table></figure>
2024-04-02 11:00:46 +08:00
<h2 id="4-Docker中部署mysql后SpringBoot连接时提示表不存在"><a href="#4-Docker中部署mysql后SpringBoot连接时提示表不存在" class="headerlink" title="4.Docker中部署mysql后SpringBoot连接时提示表不存在"></a>4.Docker中部署mysql后SpringBoot连接时提示表不存在</h2><p>使用Docer启动容器的时候设置忽略大小写表不存在是因为表名大小写的原因。</p>
2023-09-22 21:57:28 +08:00
<p><strong>方案一:启动的时候加上lower_case_table_names&#x3D; 1</strong></p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">docker run -p 3306:3306 --name mysql -v /usr/local/docker/mysql/conf:/etc/mysql -v /usr/local/docker/mysql/logs:/var/log/mysql -v /usr/local/docker/mysql/data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=123456 -d mysql:5.7 --lower_case_table_names= 1</span><br></pre></td></tr></table></figure>
<p><strong>方案二: 修改mysql挂载在宿主机的配置文件</strong></p>
<figure class="highlight properties"><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"><span class="comment"># 在配置文件中添加如下的配置</span></span><br><span class="line"><span class="attr">lower_case_table_names</span>=<span class="string">1</span></span><br></pre></td></tr></table></figure>
2024-04-02 11:00:46 +08:00
<h1 id="二-细节知识"><a href="#二-细节知识" class="headerlink" title="二.细节知识"></a>二.细节知识</h1><h2 id="1-Linux开启-关闭防火墙的命令"><a href="#1-Linux开启-关闭防火墙的命令" class="headerlink" title="1.Linux开启&#x2F;关闭防火墙的命令"></a>1.Linux开启&#x2F;关闭防火墙的命令</h2><figure class="highlight shell"><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="meta prompt_"># </span><span class="language-bash">检查防火墙状态:</span></span><br><span class="line">systemctl status firewalld</span><br><span class="line"><span class="meta prompt_"># </span><span class="language-bash">开启防火墙</span></span><br><span class="line">systemctl start firewalld</span><br><span class="line"><span class="meta prompt_"># </span><span class="language-bash">关闭防火墙(有时间限制)</span></span><br><span class="line">systemctl stop firewalld</span><br><span class="line"><span class="meta prompt_"># </span><span class="language-bash">设置开机禁用防火墙(先执行上面一条命令之后执行此命令,即可永久关闭)</span></span><br><span class="line">systemctl disable firewalld.service</span><br><span class="line"><span class="meta prompt_"># </span><span class="language-bash">设置开机启用防火墙</span></span><br><span class="line">systemctl enable firewalld.service</span><br></pre></td></tr></table></figure>
<h2 id="2-windows查看端口占用情况-杀死端口的命令"><a href="#2-windows查看端口占用情况-杀死端口的命令" class="headerlink" title="2.windows查看端口占用情况,杀死端口的命令"></a>2.windows查看端口占用情况,杀死端口的命令</h2><figure class="highlight shell"><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></pre></td><td class="code"><pre><span class="line"><span class="meta prompt_"># </span><span class="language-bash">查询被占用的端口号的信息</span></span><br><span class="line">netstat -ano | findstr &quot;8080&quot;</span><br><span class="line"><span class="meta prompt_">#</span><span class="language-bash">根据端口号的PID杀死该端口的进程 其中 17156 是8080端口的PID值</span></span><br><span class="line">taskkill /pid 17156 /f</span><br></pre></td></tr></table></figure>
<h2 id="3-Linux开启关闭键盘背光灯"><a href="#3-Linux开启关闭键盘背光灯" class="headerlink" title="3.Linux开启关闭键盘背光灯"></a>3.Linux开启关闭键盘背光灯</h2><figure class="highlight shell"><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"><span class="meta prompt_">#</span><span class="language-bash">不是永久有效的</span></span><br><span class="line"><span class="meta prompt_"># </span><span class="language-bash">开启键盘背光灯</span></span><br><span class="line">xset led named &quot;Scroll Lock&quot;</span><br><span class="line"><span class="meta prompt_">#</span><span class="language-bash">关闭键盘背光灯</span></span><br><span class="line">xset -led named &quot;Scroll Lock&quot;</span><br></pre></td></tr></table></figure>
<h2 id="4-关闭Mysql的服务"><a href="#4-关闭Mysql的服务" class="headerlink" title="4.关闭Mysql的服务"></a>4.关闭Mysql的服务</h2><figure class="highlight shell"><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="meta prompt_">#</span><span class="language-bash">查找是否安装了mysql的服务</span></span><br><span class="line">rpm -qa | grep -i mysql</span><br><span class="line"><span class="meta prompt_">#</span><span class="language-bash">查看mysql服务的状态</span></span><br><span class="line">service mysqld status</span><br><span class="line"><span class="meta prompt_">#</span><span class="language-bash">关闭mysql的服务</span></span><br><span class="line">service mysqld stop</span><br><span class="line"><span class="meta prompt_">#</span><span class="language-bash">重启的命令</span></span><br><span class="line">service mysqld restart</span><br><span class="line"><span class="meta prompt_">#</span><span class="language-bash">关闭开机自启动</span></span><br><span class="line">systemctl disable mysqld</span><br></pre></td></tr></table></figure>
<h2 id="5-前端向后端传递对象数据"><a href="#5-前端向后端传递对象数据" class="headerlink" title="5.前端向后端传递对象数据"></a>5.前端向后端传递对象数据</h2><p>传递普通对象参数的写法</p>
<p>params: searchObj</p>
<figure class="highlight javascript"><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="title function_">getPageList</span>(<span class="params">current,limit,searchObj</span>)&#123;</span><br><span class="line"> <span class="keyword">return</span> <span class="title function_">request</span>(&#123;</span><br><span class="line"> <span class="attr">url</span>: <span class="string">`<span class="subst">$&#123;api_name&#125;</span>/<span class="subst">$&#123;current&#125;</span>/<span class="subst">$&#123;limit&#125;</span>`</span>,</span><br><span class="line"> <span class="attr">method</span>: <span class="string">&#x27;get&#x27;</span>,</span><br><span class="line"> <span class="attr">params</span>: searchObj <span class="comment">//使用这种方式进行传递</span></span><br><span class="line"> &#125;)</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<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></pre></td><td class="code"><pre><span class="line"><span class="meta">@GetMapping(&quot;/&#123;page&#125;/&#123;limit&#125;&quot;)</span></span><br><span class="line"><span class="keyword">public</span> Result <span class="title function_">pageQueryRole</span><span class="params">(<span class="meta">@PathVariable</span> Long page,</span></span><br><span class="line"><span class="params"> <span class="meta">@PathVariable</span> Integer limit,</span></span><br><span class="line"><span class="params"> SysRoleQueryVo sysRoleQueryVo)</span> &#123; <span class="comment">//普通的对象进行接收 没有添加注解</span></span><br><span class="line"></span><br><span class="line"> Page&lt;SysRole&gt; pageParam = <span class="keyword">new</span> <span class="title class_">Page</span>&lt;&gt;(page, limit);</span><br><span class="line"> LambdaQueryWrapper&lt;SysRole&gt; queryWrapper = <span class="keyword">new</span> <span class="title class_">LambdaQueryWrapper</span>&lt;&gt;();</span><br><span class="line"> queryWrapper.like(!StringUtils.isEmpty(sysRoleQueryVo.getRoleName()),SysRole::getRoleName, sysRoleQueryVo.getRoleName());</span><br><span class="line"> Page&lt;SysRole&gt; sysRolePage = sysRoleService.page(pageParam, queryWrapper);</span><br><span class="line"> <span class="keyword">return</span> Result.ok(sysRolePage);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>json格式的传递</p>
<p>data: searchObj</p>
<figure class="highlight javascript"><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="title function_">add</span>(<span class="params">sysRole</span>)&#123;</span><br><span class="line"> <span class="keyword">return</span> <span class="title function_">request</span>(&#123;</span><br><span class="line"> <span class="attr">url</span>: <span class="string">`<span class="subst">$&#123;api_name&#125;</span>/save`</span>,</span><br><span class="line"> <span class="attr">method</span>: <span class="string">&#x27;post&#x27;</span>,</span><br><span class="line"> <span class="attr">data</span>: sysRole <span class="comment">//使用这种方式进行传递</span></span><br><span class="line"> &#125;)</span><br><span class="line"> &#125;</span><br></pre></td></tr></table></figure>
<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></pre></td><td class="code"><pre><span class="line"><span class="meta">@PostMapping(&quot;/save&quot;)</span></span><br><span class="line"> <span class="keyword">public</span> Result <span class="title function_">save</span><span class="params">(<span class="meta">@RequestBody</span> SysRole sysRole)</span>&#123; <span class="comment">//JSON格式对象的传递 需要使用注解@RequestBody</span></span><br><span class="line"> <span class="type">boolean</span> <span class="variable">isSave</span> <span class="operator">=</span> sysRoleService.save(sysRole);</span><br><span class="line"> <span class="keyword">return</span> isSave? Result.ok() : Result.fail();</span><br><span class="line"> &#125;</span><br></pre></td></tr></table></figure>
<h2 id="6-调整日志的级别"><a href="#6-调整日志的级别" class="headerlink" title="6.调整日志的级别"></a>6.调整日志的级别</h2><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></pre></td><td class="code"><pre><span class="line"><span class="attr">logging:</span></span><br><span class="line"> <span class="attr">level:</span></span><br><span class="line"> <span class="comment"># 注意这里包的路径要根据实际情况t</span></span><br><span class="line"> <span class="attr">com.atguigu.gulimall:</span> <span class="string">debug</span></span><br></pre></td></tr></table></figure>
<h2 id="7-JsonInclude注解"><a href="#7-JsonInclude注解" class="headerlink" title="7.@JsonInclude注解"></a>7.@JsonInclude注解</h2><figure class="highlight java"><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"><span class="meta">@JsonInclude(JsonInclude.Include.NON_EMPTY)</span><span class="comment">//这里是当children为空的时候向前端传递数据就不带这个</span></span><br><span class="line"><span class="keyword">private</span> List&lt;CategoryEntity&gt; children;</span><br></pre></td></tr></table></figure>
<h2 id="8-node相关的问题"><a href="#8-node相关的问题" class="headerlink" title="8.node相关的问题"></a>8.node相关的问题</h2><figure class="highlight shell"><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></pre></td><td class="code"><pre><span class="line"><span class="meta prompt_">#</span><span class="language-bash">查看node的版本</span></span><br><span class="line">node -v</span><br><span class="line"><span class="meta prompt_">#</span><span class="language-bash">查看npm的版本</span></span><br><span class="line">npm -v</span><br><span class="line"><span class="meta prompt_">#</span><span class="language-bash">查看npm使用的镜像源(npm镜像源)</span></span><br><span class="line">npm get registry</span><br><span class="line"><span class="meta prompt_">#</span><span class="language-bash">设置淘宝镜像源</span></span><br><span class="line">npm config set registry http://registry.npm.taobao.org</span><br></pre></td></tr></table></figure>
2024-06-14 22:00:25 +08:00
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