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Servlet server communication problems

Elías Porfirio

Joined: Jun 08, 2009
Posts: 4

I am writing an internet application that works like an instant messenger. The clients are java apps and the server is a servlet and they are communicating via http. The problem that i am facing is I want when a client sends a message it will be forwarded to the server which will send the message to selected recipients. How do i create a way to identify clients so the server will know who to send the message to? Can this be done? Any help would be appreciated.

amol deshpande
Ranch Hand

Joined: Sep 05, 2003
Posts: 162

From the java application you can use URLConnection class which allows the HTTP can use getInputStream and getOutputStream() to pass data between client and server. This allows for lightweight communication between Servlet/Jsp (Web resource) and a Java application. You can maintain the URL which has fields which identify the clients such as userId=client1 where cilent 1 is generated from Server.

Ulf Dittmer

Joined: Mar 22, 2005
Posts: 42965
Welcome to JavaRanch.

Do you require users to authenticate themselves? If so, each connection is associated to one particular user. And since each incoming message is also associated to one particular user, the server should be able to figure out whom to forward it to (since it keeps an internal list of ongoing conversations).
Elías Porfirio

Joined: Jun 08, 2009
Posts: 4
Thanks Ulf Dittmer and amol deshpande.

I am using URLConnection to connect to the Servlet and the users are not required to authenticate. But if i give the client a session object can this be used to identify them, i know that is what usually happens when users authenticate.

I agree. Here's the link:
subject: Servlet server communication problems
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