jsp 实现在线人数统计

首先写个类:

import javax.servlet.*;

import javax.servlet.http.*;

public class SessionCounter implements HttpSessionListener {

private static int activeSessions = 0;

public void sessionCreated(HttpSessionEvent se) {

activeSessions++;

}

public void sessionDestroyed(HttpSessionEvent se) {

if(activeSessions > 0)

activeSessions--;

}

public static int getActiveSessions() {

return activeSessions;

}

然后配置web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.4"

xmlns="http://java.sun.com/xml/ns/j2ee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee

http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

****************************************

<listener-class>

SessionCount.SessionCounter (注意此处)

</listener-class>

</listener>

*****************************************

</web-app>

建个JSP测试:

test.jsp

<%@ page language="Java" contentType="text/html;charset=GBK"%>

<%@ page import="java.sql.*"%>

<%@ page import="SessionCount.SessionCounter" %>

<html>

<head>

<title>无标题文档</title>

在线人数:<%=SessionCounter.getActiveSessions()%>

</body>

</html>

看看可以实现不?我也是找到的,我用了,可以统计出来.

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