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Servlet监听器实现网站在线人数统计

2014-07-10 13:01 627 查看

只提供思路：

index.jsp

<%@page import="cn.wfc.counter.CountListener"%>
<%@ 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 '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">

</head>

<body>
<div>当前访问在线人数<%=CountListener.getCountNumber() %></div>
</body>
</html>

CountListener.java

package cn.wfc.counter;

import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

public class CountListener implements HttpSessionListener {

private static long countNumber = 0;

public void sessionCreated(HttpSessionEvent arg0) {
countNumber++ ;
}

public void sessionDestroyed(HttpSessionEvent arg0) {
countNumber-- ;
}

public static long getCountNumber(){
return countNumber;
}

}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<listener>
<listener-class>cn.wfc.counter.CountListener</listener-class>
</listener>
</web-app>

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标签： Servlet监听器网站在线人数

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