Number of online people using Httpsessionlistener statistics

Source: Internet
Author: User

JSP Display online number code

Write the following and compile it for sessiioncounter.class and then put it on your site classpath sessioncount (build this directory yourself) below

package SessionCount;
import javax.servlet.*;
import javax.servlet.http.*;
public class SessionCounter implements HttpSessionListener {
private static int activeSessions = 0;
public void sessionCreated(HttpSessionEvent se) {
public void sessionDestroyed(HttpSessionEvent se) {
if(activeSessions > 0)
public static int getActiveSessions() {
return activeSessions;

Then create a online.jsp file to display the number of people online

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


<%= SessionCounter.getActiveSessions() %>

Then you need to create a web.xml file in the Web-inf of your website as follows:

<!-- Web.xml -->
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
<!-- Listeners -->

Then restart your application server and access the online.jsp check to see if the display is correct.

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