介绍 package com;
,
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
,/* *
,* Application Lifecycle Listener implementation class MyContexxtLis
,*
,*/@WebListener
public class CountListen implements ServletContextListener {
,
,/* *
,,*,Default 构造函数只
,,*/public 才能;CountListen (), {
,,,//,TODO Auto-generated constructor 存根
,,}
,/* *
,,*,@see ServletContextListener # contextInitialized (ServletContextEvent)
,,*/public 才能;void contextInitialized (ServletContextEvent arg0), {,
,,arg0.getServletContext () .setAttribute (“count", 100);
,,}
,/* *
,,*,@see ServletContextListener # contextDestroyed (ServletContextEvent)
,,*/public 才能;void contextDestroyed (ServletContextEvent arg0), {,
,,,,//,TODO Auto-generated method 存根
,,}
,
} package com;
,
import javax.servlet.annotation.WebListener;
import javax.servlet.http.HttpSessionAttributeListener;
import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
,
,
@WebListener
public class SessionListen implements HttpSessionListener, HttpSessionAttributeListener {
,
public 才能;SessionListen (), {
,,,//,TODO Auto-generated constructor 存根
,,}
,
public 才能;void attributeRemoved (HttpSessionBindingEvent arg0), {,
,,System.out.println (“remove" +“\ t" + arg0.getName arg0.getValue () + ());
,,}
,
public 才能;void attributeAdded (HttpSessionBindingEvent arg0), {,
,,System.out.println (“add" +“\ t" + arg0.getName arg0.getValue () + ());
,,}
,
public 才能;void attributeReplaced (HttpSessionBindingEvent arg0), {,
,,System.out.println (“replace" +“\ t" + arg0.getName arg0.getValue () + ());
,,}
,
public 才能;void sessionCreated (HttpSessionEvent arg0), {,
,,System.out.println (“session create");
,Integer i=(整数)arg0.getSession () .getServletContext () .getAttribute (“count");
,我+ +;
.getServletContext, arg0.getSession () () .setAttribute (“count",, i);
,
,,}
,
public 才能;void sessionDestroyed (HttpSessionEvent arg0), {,
,Integer i=(整数)arg0.getSession () .getServletContext () .getAttribute (“count");
,我,;
.getServletContext, arg0.getSession () () .setAttribute (“count",, i);
,System.out.println (“session destroy" + i);
,
,,}
,
} & lt; % @ page 语言=癹ava", contentType=皌ext/html;, charset=UTF-8"
pageEncoding才能=癠TF-8" %比;
& lt; ! DOCTYPE html PUBLIC “-//W3C//DTD html 4.01,过渡//EN",“http://www.w3.org/TR/html4/loose.dtd"比;
& lt; html>
& lt; head>
& lt; meta http-equiv=癈ontent-Type",内容=皌ext/html;, charset=UTF-8"比;
& lt; title> Insert title here
& lt;/head>
& lt; body>
& lt; % session.setMaxInactiveInterval(3);, %比;
当前在线人数:${数}
& lt;/body>
& lt;/html>
本篇文章给大家分享的是有关怎么在java中使用监听器统计在线人数,小编觉得挺实用的,因此分享给大家学习,希望大家阅读完这篇文章后可以有所收获,话不多说,跟着小编一起来看看吧。
1。项目结构
2。代码
以上就是怎么在java中使用监听器统计在线人数,小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注行业资讯频道。
