JavaFilter的使用
使用filter使session失效的用户，重新跳转到登录页面：
1.前台简单的登录测试页面login.jsp
2.struts.xml的配置信息：
3.LoginAction如下：
4.过滤器FilterTest如下：
5.配置Web.xml信息：
添加信息：
6.成功跳转页面success.jsp如下:
7.配置了一个Session的监听器来监听Session是否失效
8.WebRoot的目录结构：
----WebRoot
------filterJsp
-----ExtremeCompomentTest_1.jsp
------login.jsp
------success.jsp
9.结果：
在IE中输入：http://localhost:8080/FileUpload/login.jsp如下显示
提交表单之后跳转的页面为：
等待1分钟之后，在Eclipse的控制台出现"EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE"信息时，即Session已经失效了，再点击上面的"Forward to Filter URL"链接，这时候过滤器filter就会起作用，验证Session失效后，跳转到登录界面。
1.前台简单的登录测试页面login.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'login.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">
-->
<script type="text/javascript">
function submitForm(){
document.getElementById("form1").submit();
}
</script>
</head>
<body>
This is Login page. <br>
<form action="login" method="post" id="form1" name="form1">
UserName:<input type="text" id="userName" name="userName"/><input type="button" value="submit" onclick="submitForm()" id="submit1" />
</form>
</body>
</html>
2.struts.xml的配置信息：
<?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="default" extends="struts-default" namespace="/">
<action name="login" class="com.wl.action.test.LoginAction">
<result name="success">
/success.jsp
</result>
</action>
</package>
</struts>
3.LoginAction如下：
package com.wl.action.test;
import java.util.Map;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class LoginAction extends ActionSupport {
String userName;
@Override
public String execute() throws Exception {
ActionContext context=ActionContext.getContext();
Map session=context.getSession();
System.out.println("userName="+userName);
session.put("userName", userName);
return SUCCESS;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
}
4.过滤器FilterTest如下：
package com.wl.filter.test;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class FilterTest implements Filter {
public void destroy() {
// TODO Auto-generated method stub
}
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
HttpServletRequest httpReq=(HttpServletRequest)req;
HttpServletResponse httpRes=(HttpServletResponse)res;
HttpSession httpSession=httpReq.getSession();
if(httpSession.getAttribute("userName")==null){
httpRes.sendRedirect("../login.jsp");
}else{
chain.doFilter(req, res);
}
}
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub
}
}
5.配置Web.xml信息：
添加信息：
<!-- configure filter -->
<filter>
<filter-name>filterTest</filter-name>
<filter-class>com.wl.filter.test.FilterTest</filter-class>
</filter>
<filter-mapping>
<filter-name>filterTest</filter-name>
<url-pattern>/filterJsp/*</url-pattern>
</filter-mapping>
<!-- configure session timeout one minute -->
<session-config>
<session-timeout>1</session-timeout>
</session-config>
6.成功跳转页面success.jsp如下:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'success.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>
Success. <br>
<a href="filterJsp/ExtremeCompomentTest_1.jsp">Forward to Filter URL</a>
</body>
</html>
7.配置了一个Session的监听器来监听Session是否失效
package com.wl.listener.test;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
public class HttpSessionListenerTest implements HttpSessionListener {
public void sessionCreated(HttpSessionEvent arg0) {
// TODO Auto-generated method stub
System.out.println("SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS);
}
public void sessionDestroyed(HttpSessionEvent arg0) {
// TODO Auto-generated method stub
System.out.println("EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE");
}
}
8.WebRoot的目录结构：
----WebRoot
------filterJsp
-----ExtremeCompomentTest_1.jsp
------login.jsp
------success.jsp
9.结果：
在IE中输入：http://localhost:8080/FileUpload/login.jsp如下显示
提交表单之后跳转的页面为：
等待1分钟之后，在Eclipse的控制台出现"EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE"信息时，即Session已经失效了，再点击上面的"Forward to Filter URL"链接，这时候过滤器filter就会起作用，验证Session失效后，跳转到登录界面。