jsp编写当前在线人数统计代码实例
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2022-03-09 21:33:03
首先写个类: import javax.servlet.*; import javax.servlet.http.*;&nbs...
首先写个类:
看看可以实现不?我也是找到的,我用了,可以统计出来.
- 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="https://java.sun.com/xml/ns/j2ee"
- xmlns:xsi="https://www.w3.org/2001/xmlschema-instance"
- xsi:schemalocation="https://java.sun.com/xml/ns/j2ee
- https://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.
- <%@ 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.