interceptor 拦截器

<?xml version="1.0" encoding= "UTF-8" ?>

<!DOCTYPE struts PUBLIC

     "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"

     "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>

    <constant name ="struts.devMode" value= "true"></constant >

    <constant name= "struts.enable.DynamicMethodInvocation" value= "true"></constant >

     <package name ="test" namespace="/" extends= "struts-default">

     <!--      定义一个权限控制拦截器   -->

     <interceptors >

           <interceptor name ="authority" class= "com.cola.interceptor.AuthorizationInterceptor" ></interceptor >

     </interceptors >    

     <!--    定义一个全球结果集处理方式,所有经过拦截器的action都会按下面处理跳转 -->  

     <global-results >

           <result name ="login">/login.jsp</ result>

     </global-results >

           <action name ="test" class= "com.cola.action.TestAction" method ="execute">

               <result name ="success" type= "dispatcher">/test.jsp</result >

               <!-- 使用拦截器 -->

               <interceptor-ref name= "defaultStack"></interceptor-ref >

               <interceptor-ref name= "authority"></interceptor-ref >

           </action >

     </package >

     <include file ="struts2.xml"></ include>

</struts>

--------------------------------------------------

package com.cola.interceptor;

import java.util.Map;

import com.cola.bean.User;

import com.opensymphony.xwork2.Action;

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.interceptor.Interceptor;

@SuppressWarnings("all" )

public class AuthorizationInterceptor implements Interceptor{

     @Override

     public void destroy() {

           // TODO Auto-generated method stub

          

     }

     @Override

     public void init() {

           // TODO Auto-generated method stub

          

     }

     @Override

     public String intercept(ActionInvocation ai) throws Exception {

          Map<String,Object> session = ai.getInvocationContext().getSession();

          User user = (User) session.get( "user");

           if( user!= null){

               return ai.invoke();

          }

           return Action. LOGIN;

     }

}