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spring session同域下单点登录实现解析

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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>

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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