Struts2中一个自定义拦截器的使用

时间：2023-12-22 17:40:26

1、自定义的拦截器的类:

 package it.web.interceptor;

 import com.opensymphony.xwork2.ActionContext;

 import com.opensymphony.xwork2.ActionInvocation;

 import com.opensymphony.xwork2.interceptor.Interceptor;

 @SuppressWarnings("serial")

 public class PermissionInterceptor implements Interceptor {

     public void destroy() {

     }

     public void init() {

     }

     //invoke调用的意思

     /**

      * invocation:action的调用者

      */

     public String intercept(ActionInvocation invocation) throws Exception

     {

         Object user = ActionContext.getContext().getSession().get("user");

         /*

          * 如果user不为null,代表用户已经登录,允许执行action中的方法

          */

         if(user!=null)

         {

             return invocation.invoke();

         }

         /*

          * 否则,不允许执行,并在上下文中放入一个提示信息

          */

         ActionContext.getContext().put("message", "你没有权限执行该操作");

         return "success";

     }

 }

2、在struts-xml配置文件中用到拦截器:

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

<!DOCTYPE struts PUBLIC

    "-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN"

    "http://struts.apache.org/dtds/struts-2.1.7.dtd">

<struts>

    <constant name="struts.action.extendsion" value="do,action"/> 

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

        <interceptors>

            <interceptor name="permission" class="it.web.interceptor.PermissionInterceptor"/> <!-- 自定义的拦截器 -->

            <interceptor-stack name="permissionStack">

                <interceptor-ref name="defaultStack"/>   <!--Struts2自带的默认的拦截栈-->

                <interceptor-ref name="permission"/>

            </interceptor-stack>

        </interceptors>

        <global-results>

            <result name="success">/WEB-INF/demo/message.jsp</result>

        </global-results>

        <action name="permission_*" class="it.web.action.PermissionAction" method="{1}">

            <interceptor-ref name="permissionStack"/>   <!--使用拦截器-->

        </action>

    </package>

</struts>

3、permissionAction类：

 package it.web.action;

 public class PermissionAction {

     private String message;

     public String getMessage() {

         return message;

     }

     public void setMessage(String message) {

         this.message = message;

     }

     public String addUI(){

         this.message = "addUI";

         return "success";

     }

     public String execute(){

         this.message = "execute";

         return "success";

     }

 }

4、jsp页面:

<1>、user.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%

    request.getSession().setAttribute("user", "user_load");

%>

用户登录

<2>、message.jsp

 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

 <%

     String user = (String)request.getSession().getAttribute("user");

 %>

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

 <html>

   <head>

   </head>

   <body>

       用户：${user}<br>

     ${message}

   </body>

 </html>

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