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Struts2拦截器—自定义拦截器验证用户登录

2013-04-24 22:26 453 查看

没有太多的理论，直接上代码吧

首页面 index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>

<body>
<a href="test">test</a>
<hr>
<s:form action="login">
<s:textfield name="username" label="用户名">
</s:textfield>
<s:submit value="提交"></s:submit>
</s:form>
</body>
</html>

2登录成功 success.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>

<body>
Welcome,<s:property value="username"></s:property>
</body>
</html>

3 验证用户的界面 result.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>

<body>
恭喜您，你已经成功登录！
</body>
</html>

4 LoginAction.java

package com.bawei.demo;

import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport{

private String username;

public String getUsername() {
return username;
}

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

public String execute() {

HttpSession session=ServletActionContext.getRequest().getSession();
session.setAttribute("username", username);
System.out.println(username);
return SUCCESS;
}

}

Test.java

package com.bawei.demo;

public class TestAction {

public String execute(){

return "success";
}

}

拦截器的代码：

package com.bawei.interceptor;

import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;

public class LoginInterceptor implements Interceptor {

@Override
public void destroy() {
// TODO Auto-generated method stub

}

@Override
public void init() {
// TODO Auto-generated method stub

}

@Override
public String intercept(ActionInvocation arg0) throws Exception {
System.out.println("拦截器.......");
HttpSession session = ServletActionContext.getRequest().getSession();
String username = (String) session.getAttribute("username");
if (username == null || username.equals("")) {
return Action.LOGIN;
} else {
return arg0.invoke();
}
}

}

web.xml 配置文件的代码：

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

<interceptors>
<interceptor name="login"
class="com.bawei.interceptor.LoginInterceptor"></interceptor>
<interceptor-stack name="loginStack">
<interceptor-ref name="login"></interceptor-ref>
<interceptor-ref name="defaultStack"></interceptor-ref>
</interceptor-stack>
</interceptors>
<action name="login" class="com.bawei.demo.LoginAction">
<result name="success">/success.jsp</result>
<result name="input">/index.jsp</result>

</action>
<action name="test" class="com.bawei.demo.TestAction">
<result name="success">/result.jsp</result>
<result name="login">/index.jsp</result>
<interceptor-ref name="loginStack"></interceptor-ref>
</action>

</package>

</struts>

工程源码

http://download.csdn.net/detail/shepherd1st/5297329

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