Tomcat集群实现Session共享
前言
实现Session共享的方法有很多种,利用redis、mysql或Tomcat等均可实现Session共享,本次是使用Tomcat实现Session共享。但此方案也有弊端,仅仅作用于Tomcat,以后会继续更新文章,推出其他解决方案。
环境准备
1、两个Tomcat
2、两个项目
首先我们简单配置一下项目,在index.jsp中添加如下测试代码,用来测试服务器间的的Session是否同步。
<body>
SessionID:<%=session.getId()%>
<BR>
SessionIP:<%=request.getServerName()%>
<BR>
SessionPort:<%=request.getServerPort()%>
</body>
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然后我们需要配置Tomcat的server.xml
<Engine name="Catalina" defaultHost="localhost">
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在这段代码下面添加如下代码
<Cluster classname="org.apache.catalina.ha.tcp.SimpleTcpCluster"
channelSendOptions="8">
<Manager classname="org.apache.catalina.ha.session.DeltaManager"
expireSessionsOnShutdown="false"
notifyListenersOnReplication="true"/>
<Channel classname="org.apache.catalina.tribes.group.GroupChannel">
<Membership classname="org.apache.catalina.tribes.membership.McastService"
address="228.0.0.4"
port="45564"
frequency="500"
dropTime="3000"/>
<Receiver classname="org.apache.catalina.tribes.transport.nio.NioReceiver"
address="auto"
port="4000"
autoBind="100"
selectorTimeout="5000"
maxThreads="6"/>
<Sender classname="org.apache.catalina.tribes.transport.ReplicationTransmitter">
<Transport classname="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>
</Sender>
<Interceptor classname="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
<Interceptor classname="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>
</Channel>
<Valve classname="org.apache.catalina.ha.tcp.ReplicationValve"
filter=""/>
<Valve classname="org.apache.catalina.ha.session.JvmRouteBinderValve"/>
<Deployer classname="org.apache.catalina.ha.deploy.FarmWarDeployer"
tempDir="/tmp/war-temp/"
deployDir="/tmp/war-deploy/"
watchDir="/tmp/war-listen/"
watchEnabled="false"/>
<ClusterListener classname="org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener"/>
<ClusterListener classname="org.apache.catalina.ha.session.ClusterSessionListener"/>
</Cluster>
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例如:
<Engine name="Catalina" defaultHost="localhost">
<Cluster>
</Cluster>
<Engine>
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两个Tomcat配置完毕后,我们修改一下两个项目的web.xml,添加
<distributable/>
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例如:
<web-app>
<display-name>spring</display-name>
<distributable />
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>
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接下来我们启动两个项目测试一下
至此Session已经实现了Tomcat集群间的共享