Struts2的自定义拦截器

拦截器文件：
package com.structs2;


import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;

public class Myinterceptor implements Interceptor {

    public void destroy() {
        
    }


    public void init() {
        

    }


    public String intercept(ActionInvocation invocation) throws Exception {
        
    //    String user = String.valueOf(ActionContext.getContext().getSession().get("user"));
        Object user = ActionContext.getContext().getSession().get("user");
//        invocation.invoke();//要用这个方法之后--被拦截到得方法执行
        System.out.println("uuuuuuuuuuuuuuuuuuuuuuuuuuu"+user);
        if(user!=null)//代表用户已登录允许执行Action中的方法
            return invocation.invoke();
        
        ActionContext.getContext().put("message", "你无权执行此操作");
        return "success";
    }

}

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>

    <package name="default" namespace="/test" extends="struts-default">
<interceptors>
<interceptor name="My" class="com.structs2.Myinterceptor"></interceptor><!-- 定义拦截器 -->
<interceptor-stack name="MyStack"><!-- 定义拦截器栈 -->
<interceptor-ref name="defaultStack"/><!-- 调用默认的拦截器栈里的所有拦截器,写在前面 -->
<interceptor-ref name="My"/><!--调用拦截器，写在后面-->
</interceptor-stack>
</interceptors>
    <!--      <default-interceptor-ref name="MyStack"/> 此包中的所有Action都可以用到此拦截器-->
       
        <global-results>
        <result name="success" >/hello.jsp</result>
        </global-results>
        <action name="list*" class="com.structs2.HelloWordAction"
            method="{1}">
        <!--     <interceptor-ref name="My"/>调用拦截器 丢掉的默认的许多拦截器 -->
           
            <interceptor-ref name="MyStack"/><!--调用自己定义的拦截器栈只有这个Action可以用到这个拦截器 -->
        <!--      <interceptor-ref name="xxx"/> 如果对这个Action再定义拦截器，则默认的放在前边，再定义的放到后边-->
        </action>
       
       
    </package>
</struts>