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Struts2自定义拦截器实例—登陆权限验证

發布時間：2025/6/15 编程问答 19 豆豆

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版本：struts2.1.6

此實例實現功能：用戶需要指定用戶名登陸，登陸成功進入相應頁面執行操作，否則返回到登陸頁面進行登陸，當直接訪問操作頁面（登陸后才能訪問的頁面）時則不允許，須返回登陸頁面。

代碼如下：

一、頁面

[xhtml] view plain copy

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

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

<html>??

??<head>????

????<title>yuewei'Login</title>???

????<!--?

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

????-->??

??</head>??

????

??<body>??

??<form?action="login.action"?method="post">??

??User:<input?type="text"?name="username"><br>??

??Passoword:<input?type="password"?name="password"><br>??

??<input?type="submit"?value="submit">??

??</form>??

?????

</body>??

</html>??

welcome.jsp

[xhtml] view plain copy

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

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

<html>??

??<head>??

?????

????<title>?yuewei's?Welcome</title>??

??????

?<!--?

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

?-->??

??</head>??

????

??<body>??

??<h1>登錄成功后顯示此頁面</h1>??

??<a?href="show.action"?mce_href="show.action">show</a>??

??</body>??

</html>??

show.jsp

[xhtml] view plain copy

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

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

<html>??

??<head>??

??????

????<title>yuewei's?Show</title>??

??????

????<!--?

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

????-->??

??</head>??

????

??<body>??

????Show?This?Page???

????????登錄后執行此頁面<br>??

??</body>??

</html>??

二、Action

LoginFormAction

[java] view plain copy

package?com.ywjava.action;??

import?com.opensymphony.xwork2.ActionSupport;??

public?class?LoginFormAction?extends?ActionSupport?{??

????public?String?exexcute()?{??

????????return?"success";??

????}??

}??

LoginAction

[java] view plain copy

package?com.ywjava.action;??

import?com.opensymphony.xwork2.ActionContext;??

import?com.opensymphony.xwork2.ActionSupport;??

import?com.ywjava.utils.Constants;??

public?class?LoginAction?extends??ActionSupport{??

private?String?username;??

private?String?password;??

public?String?getPassword()?{??

????return?password;??

}??

public?void?setPassword(String?password)?{??

????this.password?=?password;??

}??

public?String?getUsername()?{??

????return?username;??

}??

public?void?setUsername(String?username)?{??

????this.username?=?username;??

}??

private?boolean?isInvalid(String?value)?{?????

????return?(value?==?null?||?value.length()?==?0);?????

}?????

public?String?execute(){??

????????System.out.println(username);??

????????System.out.println(password);??

??????????

?????????if?(isInvalid(getUsername()))?????

????????????????return?INPUT;?????

????????

????????????if?(isInvalid(getPassword()))?????

????????????????return?INPUT;?????

????????

????if(this.getUsername().equals("yuewei")&&?this.getPassword().equals("yuewei")){??

????????ActionContext.getContext().getSession().put(Constants.USER_SESSION,getUsername());??

????????ActionContext.getContext().getSession().put(Constants.PASS,getPassword());??

????????return?"success";??

????}??

????return?"error";??

}??

ShowAction

[java] view plain copy

package?com.ywjava.action;??

import?com.opensymphony.xwork2.ActionSupport;??

public?class?ShowAction?extends?ActionSupport?{??

?public?String?execute()?{??

??return?"success";??

?}??

}??

三、攔截器

[java] view plain copy

package?com.ywjava.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.ywjava.utils.Constants;??

public?class?LoginInterceptor?extends?AbstractInterceptor?{??

????@Override??

????public?String?intercept(ActionInvocation?invocation)?throws?Exception?{??

????????//?取得請求相關的ActionContext實例??

????????ActionContext?ctx?=?invocation.getInvocationContext();??

????????Map?session?=?ctx.getSession();??

????????String?user?=?(String)?session.get(Constants.USER_SESSION);??

????????//?如果沒有登陸，或者登陸所有的用戶名不是yuewei，都返回重新登陸??

????????if?(user?!=?null?&&?user.equals("yuewei"))?{??

????????????System.out.println("test");??

????????????return?invocation.invoke();??

????????}??

????????ctx.put("tip",?"你還沒有登錄");??

????????return?Action.LOGIN;??

????}??

}??

四 struts.xml

[c-sharp] view plain copy

<?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="authority"?extends="struts-default">??

??????

??????????

????????<interceptors>??

????????????<interceptor?name="authority"??

????????????????class="com.ywjava.interceptot.LoginInterceptor">??

????????????</interceptor>??

??????????????

????????????<interceptor-stack?name="mydefault">??

????????????????<interceptor-ref?name="defaultStack"?/>??

????????????????<interceptor-ref?name="authority"?/>??

????????????</interceptor-stack>??

????????</interceptors>??

??????????

????????<global-results>??

??????????????

????????????<result?name="login">/login.jsp</result>??

????????</global-results>??

????????<action?name="loginform"??

????????????class="com.ywjava.action.LoginFormAction">??

????????????<result?name="success">/login.jsp</result>??

????????</action>??

??????????

????????<action?name="login"?class="com.ywjava.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.ywjava.action.ShowAction">??

????????????<result?name="success">/show.jsp</result>??

??????????????

????????????<interceptor-ref?name="mydefault"?/>??

????????</action>??

??????????

????</package>??

</struts>?

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