Posted on 2007-04-09 15:12
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SessionCounter.java
==============
package SessionCount;
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;
}
}
web.xml
=========
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns=" xmlns:xsi=" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
...............
<!-- Listeners -->
<listener>
<listener-class>
SessionCount.SessionCounter
</listener-class>
...............
</listener>
</web-app>
===============
test.jsp
<%@ page language="Java" contentType="text/html;charset=GBK"%>
<%@ page import="java.sql.*"%>
<%@ page import="SessionCount.SessionCounter" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK">
<title>無標題文檔</title>
<body bgcolor="#FFFFFF">
在線:<%=SessionCounter.getActiveSessions()%>
</body>
</html>