See below
Lyubomir Pashov wrote:
Hello,
I am new to Servlets.
Excuse me if such a question was been already answered before, but when I searcher the archives, the error "A configuration error was detected in the CGI script; the SEARCH-HELP template could not be found." has occurred.
So, I need to understand do I need (and if "yes" - then how) to create new instance of my Servlet, each separated in new Thread for evrey new connected client?
First I thought that this is done by default, and maybe a new copy of the servlet is created for each client... But I found out, that if a field is created , which increments its value into the doPost(...) /or doGet(...)/ method, its value grows up consecutively, no matter which client does its doPost method. It behaves as a static field...
That's what threads do. There are multiple threads of execution going
through doGet and doPost depending on the request and all of them share
the class variables.
Is there a method which to force the Servlet to create new fields instances for each client, or this is not needed (and I am on a wrong way)?
Yes, it's called HttpSession. You should be putting stuff that
describes the client request in it.
Create an object that will hold things for a client:
class User{
int visits;
String name;
}
Create or get an existing session like this:
HttpSession session = request.getSession(true);
Check if it already has the user object and if it doesn't put it there:
User user = (User)session.getAttribute("userObject");
if (user == null)
session.putAttribute("userObject",user);
At this point you have a user object that's associated with one client.
you can do
user.visits++;
and then display the number of visits.
Thanks,
Lyubomir.
Good luck,
d.
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Instinet Corporation
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