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Editorial Team
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Asked: 2026-06-02T20:02:23+00:00

I tried to use application object to record how many visitors have viewed this

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I tried to use application object to record how many visitors have viewed this page,but after I refreshed the page I closed the browser,and when I open the browser again to view this page,the record back to the number I started to refresh.I don’t know why?

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %>
<html>
    <body>
        <%
            Integer count;
            synchronized (application) {
                count = (Integer) application.getAttribute("count");
                if(count == null)
                    count = new Integer(0);
                count = new Integer(count.intValue() + 1);
                application.setAttribute("count", count);
            }
        %>
        This page has been visited <%= count.intValue() %> times！
    </body>
</html>
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1 Answer

  1. Editorial Team

    Why have synchronized? Why dont you just use a global variable (ie java static)?

    You don’t have to worry about threads on the web-server. It should handle that.

    A global variable on the server will be the same for all threads.

    Sample here http://www.tutorialspoint.com/jsp/jsp_hits_counter.htm

    which says to use :

    application.setAttribute(String Key, Object Value);

    then get it with ..

    application.getAttribute(String Key);

    An example:

    <%
    Integer hitsCount = (Integer)application.getAttribute("hitCounter");
    if( hitsCount ==null || hitsCount == 0 ){
       /* First visit */
       out.println("Welcome to my website!");
       hitsCount = 1;
    }else{
       /* return visit */
       out.println("Welcome back to my website!");
       hitsCount += 1;
    }
    application.setAttribute("hitCounter", hitsCount);
%>

    with

    <p>Total number of visits: <%= hitsCount%></p>
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