<div id="content_views" class="markdown_views"> <!-- flowchart 箭头图标 勿删 --> <svg xmlns="http://www.w3.org/2000/svg" style="display: none;"> <path stroke-linecap="round" d="M5,0 0,2.5 5,5z" id="raphael-marker-block" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);"></path> </svg> <h2 id="前言"><a name="t0"></a>前言：</h2>html
<p>session共享策略有不少，常见的有粘性复制，高并发下效率查。tomcat-redis-session-manager无疑是一个挺好的方案，缺点要配置tomcat，有点复杂。最优的方案莫过于使用Spring-Session无缝整合redis，只要项目修改便可。</p>java
<h2 id="测试项目结构"><a name="t1"></a>测试项目结构：</h2>nginx
<p>项目结构很简单： <br> <img src="https://img-blog.csdn.net/20180418192111447?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1ODMwOTQ5/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="这里写图片描述" title=""></p>web
<p><code>Test.java</code> 就是一个页面跳转，传输一下sessionid</p>redis
<pre class="prettyprint" name="code"><code class="hljs java has-numbering" onclick="mdcp.signin(event)"><span class="hljs-annotation">@Controller</span> <span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Test</span> {</span> <span class="hljs-annotation">@RequestMapping</span>(<span class="hljs-string">"/test"</span>) <span class="hljs-keyword">public</span> String <span class="hljs-title">test</span>(HttpSession session, HttpServletRequest request) { request.setAttribute(<span class="hljs-string">"id"</span>, session.getId()); <span class="hljs-keyword">return</span> <span class="hljs-string">"index"</span>; } }<div class="hljs-button signin" data-title="登陆后复制"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li><li style="color: rgb(153, 153, 153);">3</li><li style="color: rgb(153, 153, 153);">4</li><li style="color: rgb(153, 153, 153);">5</li><li style="color: rgb(153, 153, 153);">6</li><li style="color: rgb(153, 153, 153);">7</li><li style="color: rgb(153, 153, 153);">8</li><li style="color: rgb(153, 153, 153);">9</li></ul></pre>spring
<p><code>index.jsp</code> 单纯的打印一下sessionid</p>缓存
<pre class="prettyprint" name="code"><code class="hljs xml has-numbering" onclick="mdcp.signin(event)"><span class="vbscript"><%@ page language=<span class="hljs-string">"java"</span> import=<span class="hljs-string">"java.util.*"</span> pageEncoding=<span class="hljs-string">"UTF-8"</span>%></span> <span class="vbscript"><% <span class="hljs-built_in">String</span> path = <span class="hljs-built_in">request</span>.getContextPath(); <span class="hljs-built_in">String</span> basePath = <span class="hljs-built_in">request</span>.getScheme() + <span class="hljs-string">"://"</span> + <span class="hljs-built_in">request</span>.getServerName() + <span class="hljs-string">":"</span> + <span class="hljs-built_in">request</span>.getServerPort() + path + <span class="hljs-string">"/"</span>; %></span> <span class="vbscript"><%@ taglib prefix=<span class="hljs-string">"c"</span> uri=<span class="hljs-string">"http://java.sun.com/jsp/jstl/core"</span>%></span> <span class="vbscript"><%-- <%@ page isELIgnored =<span class="hljs-string">"false"</span> %></span> --%> <span class="hljs-doctype"><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"></span> <span class="hljs-tag"><<span class="hljs-title">html</span>></span> <span class="hljs-tag"><<span class="hljs-title">head</span>></span> <span class="hljs-tag"><<span class="hljs-title">base</span> <span class="hljs-attribute">href</span>=<span class="hljs-value">"<%=basePath%>"</span>></span> <span class="hljs-tag"><<span class="hljs-title">title</span>></span>My JSP 'TestUpload.jsp' starting page<span class="hljs-tag"></<span class="hljs-title">title</span>></span> <span class="hljs-tag"><<span class="hljs-title">meta</span> <span class="hljs-attribute">http-equiv</span>=<span class="hljs-value">"pragma"</span> <span class="hljs-attribute">content</span>=<span class="hljs-value">"no-cache"</span>></span> <span class="hljs-tag"><<span class="hljs-title">meta</span> <span class="hljs-attribute">http-equiv</span>=<span class="hljs-value">"cache-control"</span> <span class="hljs-attribute">content</span>=<span class="hljs-value">"no-cache"</span>></span> <span class="hljs-tag"><<span class="hljs-title">meta</span> <span class="hljs-attribute">http-equiv</span>=<span class="hljs-value">"expires"</span> <span class="hljs-attribute">content</span>=<span class="hljs-value">"0"</span>></span> <span class="hljs-tag"><<span class="hljs-title">meta</span> <span class="hljs-attribute">http-equiv</span>=<span class="hljs-value">"keywords"</span> <span class="hljs-attribute">content</span>=<span class="hljs-value">"keyword1,keyword2,keyword3"</span>></span> <span class="hljs-tag"><<span class="hljs-title">meta</span> <span class="hljs-attribute">http-equiv</span>=<span class="hljs-value">"description"</span> <span class="hljs-attribute">content</span>=<span class="hljs-value">"This is my page"</span>></span> <span class="hljs-tag"></<span class="hljs-title">head</span>></span> <span class="hljs-tag"><<span class="hljs-title">body</span>></span> 个人session：${id} <span class="hljs-tag"><<span class="hljs-title">br</span>></span> sessionid=<span class="vbscript"><%=session.getId()%></span> <span class="hljs-tag"></<span class="hljs-title">body</span>></span> <span class="hljs-tag"></<span class="hljs-title">html</span>></span> <div class="hljs-button signin" data-title="登陆后复制"></div></code></pre>tomcat
<p>当项目部署到nginx上的两个tomcat上时，每次访问地址，打印出来的sessionId都发生变化，这样在一些登陆的操做中，用户明明在tomcatA上登陆了，可是用户的其余操做负载到了TomcatB中，然而B不知道用户已经在A登陆了，又让用户登陆一次，这样用户体验极差。使用Spring-Session就是把用户的session缓存到redis中，让你们都从redis中获取用户session，这样就保证了session的共享。</p>服务器
<h2 id="使用spring-session"><a name="t2"></a>使用Spring-Session</h2>markdown
<ul> <li>pom.xml 增长依赖</li> </ul>
<pre class="prettyprint" name="code"><code class="hljs xml has-numbering" onclick="mdcp.signin(event)"><span class="hljs-comment"><!-- 使用Spring Session来解决Session共享问题 --></span> <span class="hljs-tag"><<span class="hljs-title">dependency</span>></span> <span class="hljs-tag"><<span class="hljs-title">groupId</span>></span>org.springframework.session<span class="hljs-tag"></<span class="hljs-title">groupId</span>></span> <span class="hljs-tag"><<span class="hljs-title">artifactId</span>></span>spring-session-data-redis<span class="hljs-tag"></<span class="hljs-title">artifactId</span>></span> <span class="hljs-tag"><<span class="hljs-title">version</span>></span>1.3.0.RELEASE<span class="hljs-tag"></<span class="hljs-title">version</span>></span> <span class="hljs-tag"><<span class="hljs-title">type</span>></span>pom<span class="hljs-tag"></<span class="hljs-title">type</span>></span> <span class="hljs-tag"></<span class="hljs-title">dependency</span>></span> <span class="hljs-tag"><<span class="hljs-title">dependency</span>></span> <span class="hljs-tag"><<span class="hljs-title">groupId</span>></span>biz.paluch.redis<span class="hljs-tag"></<span class="hljs-title">groupId</span>></span> <span class="hljs-tag"><<span class="hljs-title">artifactId</span>></span>lettuce<span class="hljs-tag"></<span class="hljs-title">artifactId</span>></span> <span class="hljs-tag"><<span class="hljs-title">version</span>></span>3.5.0.Final<span class="hljs-tag"></<span class="hljs-title">version</span>></span> <span class="hljs-tag"></<span class="hljs-title">dependency</span>></span><div class="hljs-button signin" data-title="登陆后复制"></div></code></pre>
<ul> <li>web.xml增长配置</li> </ul>
<pre class="prettyprint" name="code"><code class="hljs xml has-numbering" onclick="mdcp.signin(event)"><span class="hljs-comment"><!-- Spring session --></span> <span class="hljs-tag"><<span class="hljs-title">filter</span>></span> <span class="hljs-tag"><<span class="hljs-title">filter-name</span>></span>springSessionRepositoryFilter<span class="hljs-tag"></<span class="hljs-title">filter-name</span>></span> <span class="hljs-tag"><<span class="hljs-title">filter-class</span>></span>org.springframework.web.filter.DelegatingFilterProxy<span class="hljs-tag"></<span class="hljs-title">filter-class</span>></span> <span class="hljs-tag"></<span class="hljs-title">filter</span>></span> <span class="hljs-tag"><<span class="hljs-title">filter-mapping</span>></span> <span class="hljs-tag"><<span class="hljs-title">filter-name</span>></span>springSessionRepositoryFilter<span class="hljs-tag"></<span class="hljs-title">filter-name</span>></span> <span class="hljs-tag"><<span class="hljs-title">url-pattern</span>></span>/*<span class="hljs-tag"></<span class="hljs-title">url-pattern</span>></span> <span class="hljs-tag"><<span class="hljs-title">dispatcher</span>></span>REQUEST<span class="hljs-tag"></<span class="hljs-title">dispatcher</span>></span> <span class="hljs-tag"><<span class="hljs-title">dispatcher</span>></span>ERROR<span class="hljs-tag"></<span class="hljs-title">dispatcher</span>></span> <span class="hljs-tag"></<span class="hljs-title">filter-mapping</span>></span><div class="hljs-button signin" data-title="登陆后复制"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li><li style="color: rgb(153, 153, 153);">3</li><li style="color: rgb(153, 153, 153);">4</li><li style="color: rgb(153, 153, 153);">5</li><li style="color: rgb(153, 153, 153);">6</li><li style="color: rgb(153, 153, 153);">7</li><li style="color: rgb(153, 153, 153);">8</li><li style="color: rgb(153, 153, 153);">9</li><li style="color: rgb(153, 153, 153);">10</li><li style="color: rgb(153, 153, 153);">11</li></ul></pre>
<ul> <li>Spring.xml增长配置 <br> 做用是导入redis配置<code>redis.properties</code>，导入新建的一个配置文件<code>spring-session.xml</code></li> </ul>
<pre class="prettyprint" name="code"><code class="hljs r has-numbering" onclick="mdcp.signin(event)"><context:property-placeholder location=<span class="hljs-string">"classpath:db.properties,classpath*:redis.properties"</span> ignore-unresolvable=<span class="hljs-string">"true"</span>/> <span class="hljs-keyword">...</span> <import resource=<span class="hljs-string">"classpath:spring-session.xml"</span>/><div class="hljs-button signin" data-title="登陆后复制"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li><li style="color: rgb(153, 153, 153);">3</li></ul></pre>
<ul> <li>新增配置spring-session.xml</li> </ul>
<pre class="prettyprint" name="code"><code class="hljs xml has-numbering" onclick="mdcp.signin(event)"><span class="hljs-pi"><?xml version="1.0" encoding="UTF-8"?></span> <span class="hljs-tag"><<span class="hljs-title">beans</span> <span class="hljs-attribute">xmlns</span>=<span class="hljs-value">"http://www.springframework.org/schema/beans"</span> <span class="hljs-attribute">xmlns:xsi</span>=<span class="hljs-value">"http://www.w3.org/2001/XMLSchema-instance"</span> <span class="hljs-attribute">xmlns:util</span>=<span class="hljs-value">"http://www.springframework.org/schema/util"</span> <span class="hljs-attribute">xsi:schemaLocation</span>=<span class="hljs-value">"http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd"</span>></span> <span class="hljs-comment"><!-- 建立名为springSessionRepositoryFilter 的Spring Bean，继承自Filter。 springSessionRepositoryFilter替换容器默认的HttpSession支持为Spring Session， 将Session实例存放在Redis中 --></span> <span class="hljs-tag"><<span class="hljs-title">bean</span> <span class="hljs-attribute">id</span>=<span class="hljs-value">"redisHttpSessionConfiguration"</span> <span class="hljs-attribute">class</span>=<span class="hljs-value">"org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration"</span> /></span> <span class="hljs-comment"><!-- 使用LettuceConnectionFactory --></span> <span class="hljs-tag"><<span class="hljs-title">bean </span> <span class="hljs-attribute">class</span>=<span class="hljs-value">"org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory"</span>></span> <span class="hljs-tag"><<span class="hljs-title">property</span> <span class="hljs-attribute">name</span>=<span class="hljs-value">"hostName"</span> <span class="hljs-attribute">value</span>=<span class="hljs-value">"${redis.ip}"</span> /></span> <span class="hljs-tag"><<span class="hljs-title">property</span> <span class="hljs-attribute">name</span>=<span class="hljs-value">"port"</span> <span class="hljs-attribute">value</span>=<span class="hljs-value">"${redis.port}"</span> /></span> <span class="hljs-tag"><<span class="hljs-title">property</span> <span class="hljs-attribute">name</span>=<span class="hljs-value">"password"</span> <span class="hljs-attribute">value</span>=<span class="hljs-value">"${redis.password}"</span> /></span> <span class="hljs-tag"></<span class="hljs-title">bean</span>></span> <span class="hljs-comment"><!-- 也能够将使用LettuceConnectionFactory改为使用JedisConnectionFactory，二者保留其一就好 --></span> <span class="hljs-comment"><!--<bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"> --></span> <span class="hljs-comment"><!--<property name="hostName" value="${redis.ip}"/> --></span> <span class="hljs-comment"><!--<property name="port" value="${redis.port}"/> --></span> <span class="hljs-comment"><!--<property name="password" value="${redis.password}"/> --></span> <span class="hljs-comment"><!--</bean> --></span> <span class="hljs-comment"><!-- 让Spring Session再也不执行config命令 --></span> <span class="hljs-comment"><!-- <util:constant static-field="org.springframework.session.data.redis.config.ConfigureRedisAction.NO_OP" /> --></span> <span class="hljs-tag"></<span class="hljs-title">beans</span>></span><div class="hljs-button signin" data-title="登陆后复制"></div></code></pre>
<ul> <li>增长redis.properties</li> </ul>
<blockquote> <p>redis.ip=193.112.76.194 <br> redis.port=6379 <br> redis.password=xxxxxx <br> redis.pool.maxTotal=10 <br> redis.pool.minIdle=4 <br> redis.pool.maxIdle=8 <br> redis.pool.testOnBorrow=true</p> </blockquote>
<p>发布到服务器上。访问index页面。不管刷新多少次结果都同样。session没变</p>
<blockquote> <p>个人session：a4b2fe35-aaa5-40c2-a7de-b1d60180ca04 <br> sessionid=a4b2fe35-aaa5-40c2-a7de-b1d60180ca04</p> </blockquote>
<h2 id="使用redis客户端查看"><a name="t3"></a>使用redis客户端查看</h2>
<p><img src="https://img-blog.csdn.net/20180418194007520?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1ODMwOTQ5/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="这里写图片描述" title=""></p>
<p>恰好有个seession一致。</p>
<h2 id="原理"><a name="t4"></a>原理：</h2>
<p>DelegatingFilterProxy拦截器拦截， springSessionRepositoryFilter替换容器默认的HttpSession支持为SpringSession每一个请求都会访问它。</p> </div>