Session会话管理
在Web项目开发中，Session会话管理是一个很重要的部分，用于存储与记录用户的状态或相关的数据；通常情况下session交由容器（tomcat）来负责存储和管理，但是如果项目部署在多台tomcat中，则session管理存在很大的问题；
1、多台tomcat之间无法共享session，比如用户在tomcat A服务器上已经登录了，但当负载均衡跳转到tomcat B时，由于tomcat B服务器并没有用户的登录信息，session就失效了，用户就退出了登录；
2、一旦tomcat容器关闭或重启也会导致session会话失效；因此如果项目部署在多台tomcat中，就需要解决session共享的问题；
配置文件
pom.xml
<dependency>
<groupId>org.springframework.session</groupId>
<artifactId>spring-session-data-redis</artifactId>
<version>1.3.1.RELEASE</version>
</dependency>
web.xml
<filter>
<filter-name>springSessionRepositoryFilter</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
<filter-name>springSessionRepositoryFilter</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
classpath:applicationContext.xml
</param-value>
</context-param>
applicationContext.xml
<context:annotation-config/>
<!-- 初始化一切spring-session准备，且把springSessionFilter放入IOC -->
<bean id="redisHttpSessionConfiguration" class="org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration">
<property name="maxInactiveIntervalInSeconds" value="300"/>
</bean>
<!-- 配置cookie信息-->
<bean class="org.springframework.session.web.http.DefaultCookieSerializer" id="defaultCookieSerializer">
<property name="cookieName" value="SESSION_NAME"/>
<property name="domainName" value="wangjun.com"/>
<property name="useHttpOnlyCookie" value="true"/>
<property name="cookiePath" value="/"/>
<property name="cookieMaxAge" value="31536000"/>
</bean>
<!-- 配置redis连接池信息-->
<bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
<property name="maxTotal" value="20"/>
</bean>
<!--配置redis连接信息-->
<bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
<property name="hostName" value="127.0.0.1"/>
<property name="port" value="6379"/>
<property name="poolConfig" ref="jedisPoolConfig"/>
</bean>
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代码测试
public class SessionServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request,response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String sesssionID = request.getSession().getId();
//部署两份，把这个地方8081改成8080就行了，只是为了区分
response.getWriter().write("8081 Server SessionID"+sesssionID);
}
}
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