(Struts2学习篇) Struts2 拦截器

版本：struts2.5.5

此实例实现功能：用户需要指定用户名登陆，登陆成功进入相应页面执行操作，否则返回到登陆页面进行登陆，当直接访问操作页面（登陆后才能访问的页面）时则不允许，须返回登陆页面。

1、Struts.xml配置文件

<package name="authority" extends="struts-default">  
<!-- 定义一个拦截器 -->  
        <interceptors>  
            <interceptor name="authority"  
                class="com.vixuan.skydrive.interceptot.LoginInterceptor">  
            </interceptor>  
            <!-- 拦截器栈 -->  
            <interceptor-stack name="mydefault">  
                <interceptor-ref name="defaultStack" />  
                <interceptor-ref name="authority" />  
            </interceptor-stack>  
        </interceptors>          
        <!-- 定义全局Result -->  
        <global-results>  
            <!-- 当返回login视图名时，转入/login.jsp页面 -->  
            <result name="login">/login.jsp</result>  
        </global-results>
        
        <action name="login" class="com.vixuan.skydrive.action.LoginAction">  
            <result name="success">/welcome.jsp</result>  
            <result name="error">/login.jsp</result>  
            <result name="input">/login.jsp</result>  
        </action>         
         <action name="show" class="com.vixuan.skydrive.action.ShowAction">  
            <result name="success">/show.jsp</result>  
            <!-- 使用此拦截器 -->  
            <interceptor-ref name="mydefault" />  
        </action>          
</package>

登入Action（LoginAction）

package com.vixuan.skydrive.action;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.vixuan.skydrive.util.*;

public class LoginAction extends ActionSupport {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private String username;
	private String password;
	//判断值是否合法
	private boolean isInvalid(String value) {     
		return (value == null || value.length() == 0);     
	}    
		
	@Override
	public String execute() throws Exception {
		// TODO Auto-generated method stub
		 if (isInvalid(getUsername()))     
             return INPUT;     
     
         if (isInvalid(getPassword()))     
             return INPUT;
         
         if(this.getUsername().equals("root")&& this.getPassword().equals("123456")){  
             ActionContext.getContext().getSession().put(Constants.USER,getUsername());  
             ActionContext.getContext().getSession().put(Constants.PASS,getPassword());  
             return "success";  
         }  

		return ERROR;
	}
	//set 和  get
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	
	
	

}

显示Action（ShowAction）

package com.vixuan.skydrive.action;

import com.opensymphony.xwork2.ActionSupport;

public class ShowAction extends ActionSupport {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	@Override
	public String execute() throws Exception {
		// TODO Auto-generated method stub
		return SUCCESS;
	}
	
	

}

登入拦截器Interceptor（LoginInteceptor）

package com.vixuan.skydrive.interceptot;

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;
import com.vixuan.skydrive.util.*;

public class LoginInterceptor extends AbstractInterceptor {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	@Override
	public String intercept(ActionInvocation invocation) throws Exception {
		// TODO Auto-generated method stub
		 // 取得请求相关的ActionContext实例   
        ActionContext ctx = invocation.getInvocationContext();  
        Map session = ctx.getSession();  
        String user = (String) session.get(Constants.USER);  
  
        // 如果没有登陆，或者登陆所有的用户名不是yuewei，都返回重新登陆   
  
        if (user != null && user.equals("root")) {  
            System.out.println("验证通过");  
            return invocation.invoke();  
        }  
  
        ctx.put("error", "你还没有登录");  

		return Action.LOGIN;
	}

}

相关jsp源代码：

登入界面----login.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>  
  
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">  
<html>  
  <head>    
    <title>用户登入</title>   
    <!-- 
    <link rel="stylesheet" type="text/css" href="styles.css" mce_href="styles.css"> 
    -->  
  </head>  
    
  <body>  
  <form action="login.action" method="post">  
        用户名:<input type="text" name="username"><br>  
       密码:<input type="password" name="password"><br>  
  <input type="submit" value="submit">  
  </form>  
     
</body>  
</html>  

拦截界面------welcomejsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>  
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">  
<html>  
  <head>  
     
    <title> 欢迎界面</title>  
      
 <!-- 
 <link rel="stylesheet" type="text/css" href="styles.css" mce_href="styles.css"> 
 -->  
  
  </head>  
    
  <body>  
  <h1>登录成功后显示此页面</h1>  
  <a href="show.action">show</a>  
  </body>  
</html>  

成功界面--------show.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>  
  
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">  
<html>  
  <head>  
      
    <title>show界面</title>  
      
    <!-- 
    <link rel="stylesheet" type="text/css" href="styles.css" mce_href="styles.css"> 
    -->  
  
  </head>  
    
  <body>  
    Show This Page   
        	登录后执行此页面<br>  
  </body>  
</html>