如何在Java中使用HttpSession在浏览器上维护计数值？

Question

I want to maintain onw count value over a Http browser. Example :

If browser once open and click on submit button make count as one. again click on button make count as two. and I want count should be less than two.

Consider a count is : private static int count & maxCount is : private int maxCount = 3 code:

 protected void processRequest(HttpServletRequest request,HttpServletResponse response)
        throws ServletException, IOException {
     HttpSession session = request.getSession();
     session.setAttribute("count", ++count);
     if(session.getAttribute("count") <= maxCount){
         //proccess stuff
     }else{
        //give maxcount completed message
     }
 }

It will work fine when open a browser first time but if I open a browser in another window then it will showing me maxCount completed message

I recognize this count is a static variable and gets memory once and all But what can I do for this. I want this count value as again zero when I open in a another window of the browser?

Answer 1

You can change like this.

protected void processRequest(HttpServletRequest request,HttpServletResponse response)
        throws ServletException, IOException {
     HttpSession session = request.getSession();
     Integer count = (Integer)session.getAttribute("count"); 
     if( count == null) {
         count  = 1;
         session.setAttribute("count", count);   
     }
     if(count <= maxCount){
         session.setAttribute("count", ++count);
         // do other stuff.
     }else{
        //give maxcount completed message
     }
 }

No need to have static variable or even a private variable.