ext+struts2 自定义拦截器session超时 无效果

[Lyn_0629]

页面是ext用ajax进行数据交互，然后做了一个自定义的session拦截器，debug已经能到SessionInterceptor，但是在跳转的时候确没反应，求解，代码如下：
1.web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
	
	
  <!-- session超时定义,单位为分钟 -->   
  <session-config>        
  	<session-timeout>1</session-timeout>    
  </session-config>
  
  <!-- 配置struts2的过滤器  -->
  <filter>
  	<filter-name>struts2</filter-name>
  	<filter-class>
  		<!--org.apache.struts2.dispatcher.FilterDispatcher-->     
  		org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
  	</filter-class>
  </filter>
  
  <filter-mapping>
  	<filter-name>struts2</filter-name>
  	<url-pattern>/*</url-pattern>
  </filter-mapping>
  
  <filter-mapping>        
  	<filter-name>struts2</filter-name>        
  	<url-pattern>*.action</url-pattern>    
  </filter-mapping>
  
   <!-- 配置struts2的CleanUp的Filter -->    
   <filter>        
   	<filter-name>struts-cleanup</filter-name>        
   	<filter-class>            
   		org.apache.struts2.dispatcher.ActionContextCleanUp        
   	</filter-class>    
   </filter>
   
   <filter-mapping>        
   	<filter-name>struts-cleanup</filter-name>        
   	<url-pattern>/*</url-pattern>
   </filter-mapping>
  
  <!-- 配置spring的监听器 -->  
  <listener>  
    <listener-class>  
        org.springframework.web.context.ContextLoaderListener   
    </listener-class>  
  </listener>
 
  <context-param>
  	<param-name>contextConfigLocation</param-name>
  	<param-value>/WEB-INF/applicationContext*.xml</param-value>
  </context-param>
  
  <context-param>
    <param-name>log4jConfigLocation</param-name>
    <param-value>/WEB-INF/classes/log4j.properties</param-value>
  </context-param> 
  
  <welcome-file-list>  
    <welcome-file>/login.jsp</welcome-file>  
  </welcome-file-list> 
</web-app>

2.自定义拦截类SessionInterceptor.java

import java.util.Map;

import login.action.LoginAction;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

public class SessionInterceptor extends AbstractInterceptor {

	private static final long serialVersionUID = 1L;

	public String intercept(ActionInvocation actionInvocation) throws Exception {
		System.out.println(">>>Session拦截器初始化...");

		ActionContext ctx = ActionContext.getContext();
		// 获取session
		Map<?, ?> session = ctx.getSession();
		// 获取拦截器对象
		Action action = (Action) actionInvocation.getAction();

		// 如果获取的拦截器为 LoginAction,则不进行拦截
		if (action instanceof LoginAction) {
			return actionInvocation.invoke();
		}

		if (null == session.get("userId")) {
               //此处执行并不进行跳转 
			return "index";  
		} else {
			return actionInvocation.invoke();
		}

	}
}

3.struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
	<include file="struts-default.xml"/>
	
	<package name="authority" extends="struts-default">
		<interceptors>
			<interceptor name="sessionout" class="common.SessionInterceptor" />
			<interceptor-stack name="mydefault">
				<interceptor-ref name="sessionout" /> 
				<interceptor-ref name="defaultStack" />
			</interceptor-stack>
		</interceptors>
		
		<default-interceptor-ref name="mydefault" />

		<global-results>
			<result name="index">/sessionfailure.jsp</result>
		</global-results> 
		
		<action name="loginAction" class="login.action.LoginAction">
			<result name="success">/page/main.jsp</result>
			<result name="input">/failure.jsp</result> 
		</action>
		
		<action name="logOut" class="login.action.LoginAction" method="logOut">  
	        <result name="success">/login.jsp</result>  
	    </action>
    </package> 
    
    <include file="struts-task.xml"></include>
    <include file="struts-daily.xml"></include>     
</struts>