struts2自定义拦截器 设置session并跳转

实例功能：当用户登陆后，session超时后则返回到登陆页面重新登陆。

为了更好的实现此功能我们先将session失效时间设置的小点，这里我们设置成1分钟

修改web.xml

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 <session-config>  
<session-timeout>1</session-timeout>  
</session-config> 
  <session-config>
 <session-timeout>1</session-timeout>
 </session-config>

此实例用到的jsp页面及登陆所涉及到的相关代码请参考：

Struts2自定义拦截器实例—登陆权限验证

实现自定义拦截器类

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package com.ywjava.interceptor;  
 
import java.util.Map;  
 
import com.opensymphony.xwork2.Action;  
import com.opensymphony.xwork2.ActionContext;  
import com.opensymphony.xwork2.ActionInvocation;  
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;  
import com.ywjava.action.LoginAction;  
import com.ywjava.utils.Constants;  
 
public class SessionIterceptor extends AbstractInterceptor {  
 
    @Override  
    public String intercept(ActionInvocation actionInvocation) throws Exception {  
        ActionContext ctx = ActionContext.getContext();  
        Map session = ctx.getSession();  
        Action action = (Action) actionInvocation.getAction();  
        if (action instanceof LoginAction) {  
            return actionInvocation.invoke();  
        }  
        String userName = (String) session.get(Constants.USER_SESSION);  
        if (userName == null) {  
            return Action.LOGIN;  
        } else {  
            return actionInvocation.invoke();  
        }  
    }  
 
} 
package com.ywjava.interceptor;

import java.util.Map;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
import com.ywjava.action.LoginAction;
import com.ywjava.utils.Constants;

public class SessionIterceptor extends AbstractInterceptor {

@Override
 public String intercept(ActionInvocation actionInvocation) throws Exception {
  ActionContext ctx = ActionContext.getContext();
  Map session = ctx.getSession();
  Action action = (Action) actionInvocation.getAction();
  if (action instanceof LoginAction) {
   return actionInvocation.invoke();
  }
  String userName = (String) session.get(Constants.USER_SESSION);
  if (userName == null) {
   return Action.LOGIN;
  } else {
   return actionInvocation.invoke();
  }
 }

}

struts.xml中定义并使用此拦截器

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<?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>  
    <package name="authority" extends="struts-default">  
      
        <!-- 定义一个拦截器 -->  
        <interceptors>  
            <interceptor name="authority" 
                class="com.ywjava.interceptor.LoginInterceptor">  
            </interceptor>  
            <interceptor name="sessionout" 
             class="com.ywjava.interceptor.SessionIterceptor"></interceptor>  
            <!-- 拦截器栈 -->  
            <interceptor-stack name="mydefault">  
                <interceptor-ref name="defaultStack" />  
                <interceptor-ref name="authority" />  
                <interceptor-ref name="sessionout"/>  
            </interceptor-stack>  
        </interceptors>  
 
        <!-- 定义全局Result -->  
        <global-results>  
            <!-- 当返回login视图名时，转入/login.jsp页面 -->  
            <result name="login">/login.jsp</result>  
        </global-results>  
 
        <action name="loginform" 
            class="com.ywjava.action.LoginFormAction">  
            <result name="success">/login.jsp</result>  
        </action>  
          
        <action name="login" class="com.ywjava.action.LoginAction">  
            <result name="success">/welcome.jsp</result>  
            <result name="error">/login.jsp</result>  
            <result name="input">/login.jsp</result>  
        </action>  
 
        <action name="show" class="com.ywjava.action.ShowAction">  
            <result name="success">/show.jsp</result>  
            <!-- 使用此拦截器 -->  
            <interceptor-ref name="mydefault" />  
        </action>  
          
    </package>  
</struts> 
<?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>
 <package name="authority" extends="struts-default">
 
  <!-- 定义一个拦截器 -->
  <interceptors>
   <interceptor name="authority"
    class="com.ywjava.interceptor.LoginInterceptor">
   </interceptor>
   <interceptor name="sessionout"
    class="com.ywjava.interceptor.SessionIterceptor"></interceptor>
   <!-- 拦截器栈 -->
   <interceptor-stack name="mydefault">
    <interceptor-ref name="defaultStack" />
    <interceptor-ref name="authority" />
    <interceptor-ref name="sessionout"/>
   </interceptor-stack>
  </interceptors>

<!-- 定义全局Result -->
  <global-results>
   <!-- 当返回login视图名时，转入/login.jsp页面 -->
   <result name="login">/login.jsp</result>
  </global-results>

<action name="loginform"
   class="com.ywjava.action.LoginFormAction">
   <result name="success">/login.jsp</result>
  </action>
  
  <action name="login" class="com.ywjava.action.LoginAction">
   <result name="success">/welcome.jsp</result>
   <result name="error">/login.jsp</result>
   <result name="input">/login.jsp</result>
  </action>

<action name="show" class="com.ywjava.action.ShowAction">
   <result name="success">/show.jsp</result>
   <!-- 使用此拦截器 -->
   <interceptor-ref name="mydefault" />
  </action>
  
 </package>
</struts>

当我们登陆后一分钟不做任何操作刷新后则会跳转到登陆页面