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package homeworklistener.listener;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.ServletRequestEvent;
import javax.servlet.ServletRequestListener;
public class Weblistener implements ServletRequestListener,ServletContextListener{
@Override
public void contextInitialized(ServletContextEvent sce) {
ServletContext sc=sce.getServletContext();
sc.setAttribute("count", 0);
}
@Override
public void contextDestroyed(ServletContextEvent sce) {
// TODO Auto-generated method stub
}
@Override
public void requestDestroyed(ServletRequestEvent sre) {
}
@Override
public void requestInitialized(ServletRequestEvent sre) {
ServletContext sc=sre.getServletContext();
int count = (int) sc.getAttribute("count");
count++;
sc.setAttribute("count", count);
}
}
JSP code
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<h5>当前在线人数为 :${applicationScope.count}</h5>
</body>
</html>