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;

}

}