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>
这篇文章我用到的关键地方是struts.xml配置文件中对自定义拦截器的配置
<!-- 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> <!--在Action中使用拦截器--> <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>
另外还有第三部分的自定义拦截器的编写
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Lynx
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