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How jsp uses application to count online users

Source: Internet
Author: User
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How jsp uses application to count online users

This article mainly introduces how to use jsp to count the number of online users using the application. The Code has more detailed comments for ease of understanding, which is a practical technique. For more information, see

This example describes how jsp uses application to count online users. Share it with you for your reference.

The specific implementation method is as follows:

The Code 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 it is the first visitor
{
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 counters </font>
</P>
<P>
<Font size = "2" color = "#000000" type = "codeph" text = "/codeph">
Welcome to this page. You are <% = number %> Users
</Font>
</P>
</Body>
</Html>

 

I hope this article will help you with jsp program design.

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