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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"> **************************************** <!-- Listeners --> <listener> <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> <meta http-equiv="Content-Type" content="text/html; charset=GBK"> <title>无标题文档</title> <body bgcolor="#FFFFFF"> 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. 第 页 责任编辑:qwer19871212
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