struts2自定义拦截器

整个过程是:

    通过user.jsp登陆,就是在session中添加(user,name)使用的命令是:request.getSession().setAttribute("user", "du");然后登到MyDefInterceptor,则进入到hello.jsp,通过quit.jsp退出,即request.getSession().removeAttribute("user");

拦截器PermissionInterceptor的代码

 1 package cn.itcast.interceptor;

 2 

 3 import org.xml.sax.SAXException;

 4 

 5 import com.opensymphony.xwork2.ActionContext;

 6 import com.opensymphony.xwork2.ActionInvocation;

 7 import com.opensymphony.xwork2.interceptor.Interceptor;

 8 import com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.State;

 9 

10 //自定义的拦截器

11 

12 public class PermissionInterceptor implements Interceptor {

13 

14     @Override

15     public void destroy() {

16         // TODO Auto-generated method stub

17         

18     }

19 

20     @Override

21     public void init() {

22         // TODO Auto-generated method stub

23         

24     }

25 

26     @Override

27     public String intercept(ActionInvocation invocation) throws Exception {

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

29         System.out.println(user);

30         if(user!=null) return invocation.invoke();//如果user不为null,代表用户已经登录

31         

32         ActionContext.getContext().put("message", "你没有该权限");

33         return "success";

34     }

35 

36 }

使用该拦截器的Action(MyDefInterceptorAction)代码:

package cn.itcast.action;

//使用自定义拦截器PermissionInterceptor的action

public class MyDefInterceptorAction {

    String message;

    

    public String getMessage() {

        return message;

    }



    public void setMessage(String message) {

        this.message = message;

    }



    public String execute(){

        this.message="execute";

        return "success";

    }

}

配置文件struts.xml

<?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>



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



    <interceptors>

        <interceptor name="permission" class="cn.itcast.interceptor.PermissionInterceptor" />

        

        <interceptor-stack name="permissionstack">

            <interceptor-ref name="defaultStack"/>

            <interceptor-ref name="permission"/>

        </interceptor-stack>

    </interceptors>

    

      <global-results>

            <result name="success">/WEB-INF/page/hello.jsp</result>

    </global-results>



     <action name="MyDefInterceptor" class="cn.itcast.action.MyDefInterceptorAction" method="execute">

        <interceptor-ref name="permissionstack" />

    </action>

    

</package>



</struts>

登陆网页user.jsp

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

<%

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

%>

用户已登录

退出网页quit.jsp

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

<%

  request.getSession().removeAttribute("user");

%>



退出
/WEB-INF/page/hello.jsp的代码为:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>



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

<html>

  <head>

    <base href="<%=basePath%>">

    

    <title>My JSP 'hello.jsp' starting page</title>

    

    <meta http-equiv="pragma" content="no-cache">

    <meta http-equiv="cache-control" content="no-cache">

    <meta http-equiv="expires" content="0">    

    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

    <meta http-equiv="description" content="This is my page">

    <!--

    <link rel="stylesheet" type="text/css" href="styles.css">

    -->



  </head>

 

  <body>

  ${message}

  </body>

</html>

 

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