Struts2自定义拦截器实例—登陆权限验证
版本：struts2.1.6
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。
代码如下：
一、页面
login.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>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
<%@ 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>登录成功后显示此页面</h1> <a href="show.action" mce_href="show.action">show</a> </body> </html>
show.jsp
<%@ 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 登录后执行此页面<br> </body> </html>
二、Action
LoginFormAction
package com.ywjava.action; import com.opensymphony.xwork2.ActionSupport; public class LoginFormAction extends ActionSupport { public String exexcute() { return "success"; } }
LoginAction
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
package com.ywjava.action; import com.opensymphony.xwork2.ActionSupport; public class ShowAction extends ActionSupport { public String execute() { return "success"; } }
三、拦截器
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 { // 取得请求相关的ActionContext实例 ActionContext ctx = invocation.getInvocationContext(); Map session = ctx.getSession(); String user = (String) session.get(Constants.USER_SESSION); // 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("yuewei")) { System.out.println("test"); return invocation.invoke(); } ctx.put("tip", "你还没有登录"); return Action.LOGIN; } }
四 struts.xml
<?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"> <!-- 定义一个拦截器 --> <interceptors> <interceptor name="authority" class="com.ywjava.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="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> <!-- 使用此拦截器 --> <interceptor-ref name="mydefault" /> </action> </package> </struts>