jsp's method of counting online population using application
- 2021-06-29 11:46:38
- OfStack
This article gives an example of how jsp uses application to count online people.Share it for your reference.
The implementation is as follows:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>application</title>
</head>
<body>
<%!
Integer number;//
synchronized void numberVisiter()
{
ServletContext application = getServletContext();
Integer num = (Integer)application.getAttribute("count");
if(num == null)// If yes 1 Visitors
{
num = new Integer(1);
application.setAttribute("count",num);
}
else
{
num = new Integer(num.intValue() + 1);
application.setAttribute("count",num);
}
}
%>
<%
if(session.isNew())
{
numberVisiter();
Integer number = (Integer)application.getAttribute("count");
}
%>
<p>
<font size="2" color="blue"> Simple Page Access Counter </font>
</p>
<p>
<font size="2" color="#000000">
Welcome to this page, you are <%=number%> Access Users
</font>
</p>
</body>
</html>I hope that the description in this paper will be helpful to everyone's jsp program design.