Get the current count of the client accessing the servlet

Any body can tell me how to know the information of every client that accessing my servlet after the client access the login interface.

Thanks.
But,
My mean is not know each client information. I want to know all the current client count is accessing my web application and the client do not include that
user has signed off the application nor the browser is closed by some reason. Sometime if you enter the forum, you maybe find how many people are in the forum current time? I just know all the users now accessing my web application

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