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<meta property="og:description" content="1.Redis的介绍 Redis是一个开源（BSD许可），内存存储的数据结构服务器，可用作数据库，高速缓存和消息队列代理。它支持字符串、哈希表、列表、集合、有序集合，位图，hyperloglogs等数据类型。内置复制、Lua脚本、LRU收回、事务以及不同级别磁盘持久化功能，同时通过Redis Sentinel提供高可用，通过Redis Cluster提供自动分区。 中文文档:http">
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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">60</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://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://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">SpringBoot整合Redis</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="2023-04-14T06:55:21.000Z" title="发表于 2023-04-14 14:55:21">2023-04-14</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="2023-09-11T23:36:50.000Z" title="更新于 2023-09-12 07:36:50">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%90%8E%E7%AB%AF/">后端</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">1.6k</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>6分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="SpringBoot整合Redis"><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"><h2 id="1-Redis的介绍"><a href="#1-Redis的介绍" class="headerlink" title="1.Redis的介绍"></a>1.Redis的介绍</h2><p> Redis是一个开源（BSD许可），内存存储的数据结构服务器，可用作数据库，高速缓存和消息队列代理。它支持字符串、哈希表、列表、集合、有序集合，位图，hyperloglogs等数据类型。内置复制、Lua脚本、LRU收回、事务以及不同级别磁盘持久化功能，同时通过Redis Sentinel提供高可用，通过Redis Cluster提供自动分区。</p>
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<p>中文文档:<a target="_blank" rel="noopener" href="https://www.redis.net.cn/">https://www.redis.net.cn/</a></p>
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<h2 id="2-入门"><a href="#2-入门" class="headerlink" title="2.入门"></a>2.入门</h2><h3 id="2-1-引入依赖"><a href="#2-1-引入依赖" class="headerlink" title="2.1 引入依赖"></a>2.1 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></pre></td><td class="code"><pre><span class="line"><span class="comment"><!-- redis --></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-data-redis<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"><!-- spring2.X集成redis所需common-pool2--></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-pool2<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>2.6.0<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></pre></td></tr></table></figure>
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<h3 id="2-2-添加配置类"><a href="#2-2-添加配置类" class="headerlink" title="2.2 添加配置类"></a>2.2 添加配置类</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><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><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.atguigu.yygh.common.config;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> com.fasterxml.jackson.annotation.JsonAutoDetect;</span><br><span class="line"><span class="keyword">import</span> com.fasterxml.jackson.annotation.PropertyAccessor;</span><br><span class="line"><span class="keyword">import</span> com.fasterxml.jackson.databind.ObjectMapper;</span><br><span class="line"><span class="keyword">import</span> org.springframework.cache.CacheManager;</span><br><span class="line"><span class="keyword">import</span> org.springframework.cache.annotation.EnableCaching;</span><br><span class="line"><span class="keyword">import</span> org.springframework.cache.interceptor.KeyGenerator;</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 class="keyword">import</span> org.springframework.data.redis.cache.RedisCacheConfiguration;</span><br><span class="line"><span class="keyword">import</span> org.springframework.data.redis.cache.RedisCacheManager;</span><br><span class="line"><span class="keyword">import</span> org.springframework.data.redis.connection.RedisConnectionFactory;</span><br><span class="line"><span class="keyword">import</span> org.springframework.data.redis.core.RedisTemplate;</span><br><span class="line"><span class="keyword">import</span> org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;</span><br><span class="line"><span class="keyword">import</span> org.springframework.data.redis.serializer.RedisSerializationContext;</span><br><span class="line"><span class="keyword">import</span> org.springframework.data.redis.serializer.RedisSerializer;</span><br><span class="line"><span class="keyword">import</span> org.springframework.data.redis.serializer.StringRedisSerializer;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.lang.reflect.Method;</span><br><span class="line"><span class="keyword">import</span> java.time.Duration;</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> 2023/4/14</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">@Configuration</span></span><br><span class="line"><span class="meta">@EnableCaching</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">RedisConfig</span> {</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 自定义key规则</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> KeyGenerator <span class="title function_">keyGenerator</span><span class="params">()</span> {</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">new</span> <span class="title class_">KeyGenerator</span>() {</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="keyword">public</span> Object <span class="title function_">generate</span><span class="params">(Object target, Method method, Object... params)</span> {</span><br><span class="line"> <span class="type">StringBuilder</span> <span class="variable">sb</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">StringBuilder</span>();</span><br><span class="line"> sb.append(target.getClass().getName());</span><br><span class="line"> sb.append(method.getName());</span><br><span class="line"> <span class="keyword">for</span> (Object obj : params) {</span><br><span class="line"> sb.append(obj.toString());</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> sb.toString();</span><br><span class="line"> }</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"> * 设置RedisTemplate规则</span></span><br><span class="line"><span class="comment"> *</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> RedisTemplate<Object, Object> <span class="title function_">redisTemplate</span><span class="params">(RedisConnectionFactory redisConnectionFactory)</span> {</span><br><span class="line"> RedisTemplate<Object, Object> redisTemplate = <span class="keyword">new</span> <span class="title class_">RedisTemplate</span><>();</span><br><span class="line"> redisTemplate.setConnectionFactory(redisConnectionFactory);</span><br><span class="line"> <span class="type">Jackson2JsonRedisSerializer</span> <span class="variable">jackson2JsonRedisSerializer</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">Jackson2JsonRedisSerializer</span>(Object.class);</span><br><span class="line"></span><br><span class="line"> <span class="comment">//解决查询缓存转换异常的问题</span></span><br><span class="line"> <span class="type">ObjectMapper</span> <span class="variable">om</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">ObjectMapper</span>();</span><br><span class="line"> <span class="comment">// 指定要序列化的域，field,get和set,以及修饰符范围，ANY是都有包括private和public</span></span><br><span class="line"> om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);</span><br><span class="line"> <span class="comment">// 指定序列化输入的类型，类必须是非final修饰的，final修饰的类，比如String,Integer等会跑出异常</span></span><br><span class="line"> om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);</span><br><span class="line"> jackson2JsonRedisSerializer.setObjectMapper(om);</span><br><span class="line"></span><br><span class="line"> <span class="comment">//序列号key value</span></span><br><span class="line"> redisTemplate.setKeySerializer(<span class="keyword">new</span> <span class="title class_">StringRedisSerializer</span>());</span><br><span class="line"> redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);</span><br><span class="line"> redisTemplate.setHashKeySerializer(<span class="keyword">new</span> <span class="title class_">StringRedisSerializer</span>());</span><br><span class="line"> redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer);</span><br><span class="line"></span><br><span class="line"> redisTemplate.afterPropertiesSet();</span><br><span class="line"> <span class="keyword">return</span> redisTemplate;</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"> * 设置CacheManager缓存规则</span></span><br><span class="line"><span class="comment"> * 缓存的时间</span></span><br><span class="line"><span class="comment"> * 乱码的处理</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> CacheManager <span class="title function_">cacheManager</span><span class="params">(RedisConnectionFactory factory)</span> {</span><br><span class="line"> RedisSerializer<String> redisSerializer = <span class="keyword">new</span> <span class="title class_">StringRedisSerializer</span>();</span><br><span class="line"> <span class="type">Jackson2JsonRedisSerializer</span> <span class="variable">jackson2JsonRedisSerializer</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">Jackson2JsonRedisSerializer</span>(Object.class);</span><br><span class="line"></span><br><span class="line"> <span class="comment">//解决查询缓存转换异常的问题</span></span><br><span class="line"> <span class="type">ObjectMapper</span> <span class="variable">om</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">ObjectMapper</span>();</span><br><span class="line"> om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);</span><br><span class="line"> om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);</span><br><span class="line"> jackson2JsonRedisSerializer.setObjectMapper(om);</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 配置序列化（解决乱码的问题）,过期时间600秒</span></span><br><span class="line"> <span class="type">RedisCacheConfiguration</span> <span class="variable">config</span> <span class="operator">=</span> RedisCacheConfiguration.defaultCacheConfig()</span><br><span class="line"> .entryTtl(Duration.ofSeconds(<span class="number">600</span>))</span><br><span class="line"> .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer))</span><br><span class="line"> .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer))</span><br><span class="line"> .disableCachingNullValues();</span><br><span class="line"></span><br><span class="line"> <span class="type">RedisCacheManager</span> <span class="variable">cacheManager</span> <span class="operator">=</span> RedisCacheManager.builder(factory)</span><br><span class="line"> .cacheDefaults(config)</span><br><span class="line"> .build();</span><br><span class="line"> <span class="keyword">return</span> cacheManager;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line">}</span><br></pre></td></tr></table></figure>
|
||
|
||
<p>说明：<br> @EnableCaching：标记注解 @EnableCaching，开启缓存，并配置Redis缓存管理器。@EnableCaching 注释触发后置处理器, 检查每一个Spring bean 的 public 方法是否存在缓存注解。如果找到这样的一个注释, 自动创建一个代理拦截方法调用和处理相应的缓存行为。</p>
|
||
<h3 id="2-3-配置文件中加入redis的配置"><a href="#2-3-配置文件中加入redis的配置" class="headerlink" title="2.3 配置文件中加入redis的配置"></a>2.3 配置文件中加入redis的配置</h3><p>application.properties</p>
|
||
<figure class="highlight properties"><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">spring.redis.host</span>=<span class="string">localhost</span></span><br><span class="line"><span class="attr">spring.redis.port</span>=<span class="string">6379</span></span><br><span class="line"><span class="attr">spring.redis.database</span>= <span class="string">0</span></span><br><span class="line"><span class="attr">spring.redis.timeout</span>=<span class="string">1800000</span></span><br><span class="line"></span><br><span class="line"><span class="attr">spring.redis.lettuce.pool.max-active</span>=<span class="string">20</span></span><br><span class="line"><span class="attr">spring.redis.lettuce.pool.max-wait</span>=<span class="string">-1</span></span><br><span class="line"><span class="comment">#最大阻塞等待时间(负数表示没限制)</span></span><br><span class="line"><span class="attr">spring.redis.lettuce.pool.max-idle</span>=<span class="string">5</span></span><br><span class="line"><span class="attr">spring.redis.lettuce.pool.min-idle</span>=<span class="string">0</span></span><br></pre></td></tr></table></figure>
|
||
|
||
<h3 id="2-4-使用Spring-Cache-Redis执行缓存操作"><a href="#2-4-使用Spring-Cache-Redis执行缓存操作" class="headerlink" title="2.4 使用Spring Cache + Redis执行缓存操作"></a>2.4 使用Spring Cache + Redis执行缓存操作</h3><h4 id="2-1-2-Cacheable"><a href="#2-1-2-Cacheable" class="headerlink" title="2.1.2 @Cacheable"></a>2.1.2 @Cacheable</h4><p> 根据方法对其返回结果进行缓存，下次请求时，如果缓存存在，则直接读取缓存数据返回；如果缓存不存在，则执行方法，并把返回的结果存入缓存中。一般用在查询方法上。</p>
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th>属性/方法名</th>
|
||
<th>解释</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody><tr>
|
||
<td>value</td>
|
||
<td>缓存名，必填，它指定了你的缓存存放在哪块命名空间</td>
|
||
</tr>
|
||
<tr>
|
||
<td>cacheNames</td>
|
||
<td>与 value 差不多，二选一即可</td>
|
||
</tr>
|
||
<tr>
|
||
<td>key</td>
|
||
<td>可选属性，可以使用 SpEL 标签自定义缓存的key</td>
|
||
</tr>
|
||
</tbody></table>
|
||
<h4 id="2-1-2-CachePut"><a href="#2-1-2-CachePut" class="headerlink" title="2.1.2 @CachePut"></a>2.1.2 @CachePut</h4><p> 使用该注解标志的方法，每次都会执行，并将结果存入指定的缓存中。其他方法可以直接从响应的缓存中读取缓存数据，而不需要再去查询数据库。一般用在新增方法上。</p>
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th>属性/方法名</th>
|
||
<th>解释</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody><tr>
|
||
<td>value</td>
|
||
<td>缓存名，必填，它指定了你的缓存存放在哪块命名空间</td>
|
||
</tr>
|
||
<tr>
|
||
<td>cacheNames</td>
|
||
<td>与 value 差不多，二选一即可</td>
|
||
</tr>
|
||
<tr>
|
||
<td>key</td>
|
||
<td>可选属性，可以使用 SpEL 标签自定义缓存的key</td>
|
||
</tr>
|
||
</tbody></table>
|
||
<h4 id="2-1-3-CacheEvict"><a href="#2-1-3-CacheEvict" class="headerlink" title="2.1.3 @CacheEvict"></a>2.1.3 @CacheEvict</h4><p> 使用该注解标志的方法，会清空指定的缓存。一般用在更新或者删除方法上</p>
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th>属性/方法名</th>
|
||
<th>解释</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody><tr>
|
||
<td>value</td>
|
||
<td>缓存名，必填，它指定了你的缓存存放在哪块命名空间</td>
|
||
</tr>
|
||
<tr>
|
||
<td>cacheNames</td>
|
||
<td>与 value 差不多，二选一即可</td>
|
||
</tr>
|
||
<tr>
|
||
<td>key</td>
|
||
<td>可选属性，可以使用 SpEL 标签自定义缓存的key</td>
|
||
</tr>
|
||
<tr>
|
||
<td>allEntries</td>
|
||
<td>是否清空所有缓存，默认为 false。如果指定为 true，则方法调用后将立即清空所有的缓存</td>
|
||
</tr>
|
||
<tr>
|
||
<td>beforeInvocation</td>
|
||
<td>是否在方法执行前就清空，默认为 false。如果指定为 true，则在方法执行前就会清空缓存</td>
|
||
</tr>
|
||
</tbody></table>
|
||
<h2 id="3-示例"><a href="#3-示例" class="headerlink" title="3.示例"></a>3.示例</h2><p>下面的第一个方法是查询数据位list集合</p>
|
||
<p> @Cacheable(value = “dict”,keyGenerator = “keyGenerator”) 对方法的结果进行缓存</p>
|
||
<p> value属性表示key的前缀 </p>
|
||
<p> keyGenerator表示key的生成规则，生成规则在配置文件中配置，这里我们使用的是方法的全类名作为key的后缀</p>
|
||
<p>第二个方法是添加数据 添加数据会造成数据库中数据的变化 我们要清除缓存</p>
|
||
<p> @CacheEvict(value = “dict”,allEntries = true) 清空指定的缓存</p>
|
||
<p> value属性表示清空以dict为前缀的所有缓存</p>
|
||
<p> allEntries 属性表示是否清空所有缓存，默认为 false。如果指定为 true，则方法调用后将立即清空所有的缓存 </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></pre></td><td class="code"><pre><span class="line"><span class="meta">@Override</span></span><br><span class="line"><span class="meta">@Cacheable(value = "dict",keyGenerator = "keyGenerator")</span></span><br><span class="line"><span class="keyword">public</span> List<Dict> <span class="title function_">findByParentId</span><span class="params">(Long parentId)</span> {</span><br><span class="line"> LambdaQueryWrapper<Dict> queryWrapper = <span class="keyword">new</span> <span class="title class_">LambdaQueryWrapper</span><>();</span><br><span class="line"> queryWrapper.eq(Dict::getParentId, parentId);</span><br><span class="line"> List<Dict> dictList = dictMapper.selectList(queryWrapper);</span><br><span class="line"> <span class="keyword">for</span> (Dict dict : dictList) {</span><br><span class="line"> dict.setHasChildren(<span class="built_in">this</span>.isHasChildren(dict.getId()));</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> dictList;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="meta">@CacheEvict(value = "dict",allEntries = true)</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">importDictData</span><span class="params">(MultipartFile file)</span> {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> EasyExcel.read(file.getInputStream(),DictEeVo.class,<span class="keyword">new</span> <span class="title class_">DictListener</span>(dictMapper)).sheet().doRead();</span><br><span class="line"> } <span class="keyword">catch</span> (IOException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br></pre></td></tr></table></figure>
|
||
|
||
<p>key的生成规则如下图:</p>
|
||
<p><img src="/pictures/image-20230414152035347.png" alt="image-20230414152035347"></p>
|
||
</article><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" href="/tags/SpringBoot/">SpringBoot</a></div><div class="post_share"><div class="social-share" data-image="/img/5.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 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href="#2-4-%E4%BD%BF%E7%94%A8Spring-Cache-Redis%E6%89%A7%E8%A1%8C%E7%BC%93%E5%AD%98%E6%93%8D%E4%BD%9C"><span class="toc-text">2.4 使用Spring Cache + Redis执行缓存操作</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#2-1-2-Cacheable"><span class="toc-text">2.1.2 @Cacheable</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#2-1-2-CachePut"><span class="toc-text">2.1.2 @CachePut</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#2-1-3-CacheEvict"><span class="toc-text">2.1.3 @CacheEvict</span></a></li></ol></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#3-%E7%A4%BA%E4%BE%8B"><span class="toc-text">3.示例</span></a></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/8957.html" title="Linux从入门到进阶"><img 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