instance variables

[Nelson Nadal]

Im still new to servlet/jsp subject, and I've a question,
since the variable inside the init() is instance, how is it possible to make a servlet/jsp have a different counter for each instance servlet?
Example: User A and B accesing the same servlet page.
User A has a counter 0 and everytime it refreshes it accumulates
User B has same procedure but the counter is independent from User A.
Thanks.

[Rajesh Kumar]

Generally there is only one instance of a servlet, and multiple
client requests result in multiple threads each calling the service method
of the single servlet instance.
If you want to count how many times each user accesses the
page (=servlet) you may want to use a session variable.
something like this, in your doGet for example

public void doGet(HttpServlerRequest request, HttpServletResponse response)
throws ServletException, IOException {
     
HttpSession session = request.getSession(); 
     String count = (String) session.getAttribute("count");             
   count = (count == null) ? "" + 0 :  "" + (Integer.parseInt(count) + 1 ); 
  

HTH
-Rajesh

[Nelson Nadal]

Hmm , ok, it's not really possible with the request object. Thanks Rajeesh.

[Malli Raman]

Originally posted by Nelson Nadal:
Hmm , ok, it's not really possible with the request object. Thanks Rajeesh.

Hi Nelson,

Even it is possible with request object by using Hidden form fields or URL rewriting, Cookies technologies (Basically all the session tracking methods will support).
Regards,
M.S.Raman