《struts2权威指南》学习笔记之使用拦截器完成权限控制

本例的功能是，必须指定用户名 scott/tiger 登陆的用户，方能查看系统中viewBook的这个资源，否则直接跳回登陆页面

登陆Action

 

package  auth;

import  com.opensymphony.xwork2.ActionSupport;
import  com.opensymphony.xwork2.ActionContext;
import  java.util. * ;



public   class  LoginAction  extends  ActionSupport
... {
    private String username;
    private String password;

    public void setUsername(String username)
    ...{
        this.username = username;
    }
    public String getUsername()
    ...{
        return username;
    }

    public void setPassword(String password)
    ...{
        this.password = password;
    }
    public String getPassword()
    ...{
        return password;
    }

    public String execute() throws Exception
    ...{
        System.out.println("进入execute方法执行体..........");
        Thread.sleep(1500);
        if (getUsername().equals("scott")
            && getPassword().equals("tiger") )
        ...{
            ActionContext ctx = ActionContext.getContext();
            Map session = ctx.getSession();
            session.put("user" , getUsername());
            return SUCCESS;
        }
        else
        ...{
            return ERROR;
        }
    }


}

 权限检测拦截器

 

package  auth;

import  java.util.Map;

import  com.opensymphony.xwork2.Action;
import  com.opensymphony.xwork2.ActionContext;
import  com.opensymphony.xwork2.ActionInvocation;
import  com.opensymphony.xwork2.interceptor.AbstractInterceptor;

public   class  AuthorityInterceptor  extends  AbstractInterceptor  ... {

    
    public String intercept(ActionInvocation invocation) throws Exception ...{
        ActionContext ctx=invocation.getInvocationContext();
        Map session=ctx.getSession();
        String user=(String)session.get("user");
        if(user!=null&&user.equals("scott"))...{
            return invocation.invoke();
        }else...{
            ctx.put("tip", "您还没有登录");
            return Action.LOGIN;
        }
        
    }

}

 

配置action (struts.xml)

 

<? xml version="1.0" encoding="GBK" ?>
<! DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
        "http://struts.apache.org/dtds/struts-2.0.dtd" >
< struts >
     < constant  name ="struts.custom.i18n.resources"  value ="globalMessages" />
     < constant  name ="struts.i18n.encoding"  value ="GBK" />

     < package  name ="lee"  extends ="struts-default" >
      
    
         < interceptors >
           < interceptor  name ="authority"  class ="auth.AuthorityInterceptor" ></ interceptor >
         </ interceptors >
        
          < global-results >
           < result  name ="login" > /login.jsp </ result >
         </ global-results >
        
         <!--  将viewBook.jsp放在web-inf下，防止直接用url访问  -->
         < action  name ="viewBook" >
           < result > /WEB-INF/viewBook.jsp </ result >
         <!--  拦截器一般配置在result之后  -->
         < interceptor-ref  name ="defaultStack" ></ interceptor-ref >
         < interceptor-ref  name ="authority" ></ interceptor-ref >   
         </ action >
        
          < action  name ="login"  class ="auth.LoginAction" >
             < result  name ="error" > /error.jsp </ result >
             < result  name ="success" > /welcome.jsp </ result >
         </ action >
        
        
    
     </ package >
    
    
</ struts >

 

web.xml

 

<? xml version="1.0" encoding="UTF-8" ?>
< web-app  version ="2.5"  
    xmlns ="http://java.sun.com/xml/ns/javaee"  
    xmlns:xsi ="http://www.w3.org/2001/XMLSchema-instance"  
    xsi:schemaLocation ="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" >
     < filter >
       < filter-name > struts2 </ filter-name >
       < filter-class > org.apache.struts2.dispatcher.FilterDispatcher </ filter-class >
     </ filter >
     < filter-mapping >
       < filter-name > struts2 </ filter-name >
       < url-pattern > /* </ url-pattern >
     </ filter-mapping >
 
 
     < filter >
       < filter-name > struts-cleanup </ filter-name >
       < filter-class > org.apache.struts2.dispatcher.ActionContextCleanUp </ filter-class >
     </ filter >
     < filter-mapping >
       < filter-name > struts-cleanup </ filter-name >
       < url-pattern > /* </ url-pattern >
     </ filter-mapping >
</ web-app >

 

viewBook.jsp  放到web-inf下

 

<% ... @ page contentType="text/html; charset=GBK" %>
< html >
< head >
     < meta  http-equiv ="Content-Type"  content ="text/html; charset=GBK" />
     < title > 作者李刚已经出版的图书： </ title >
</ head >
< body >
作者已经出版的图书： < p >
Spring2.0宝典 < br >
轻量级J2EE企业实战 < br >
基于J2EE的Ajax宝典 < br >
</ body >
</ html >

 

login.jsp

 

<% ... @ page language="java" contentType="text/html; charset=GBK" %>
<% ... @taglib prefix="s" uri="/struts-tags" %>

<% ... @ page isELIgnored="false"  %>
<%