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What happens with multiple clients?

This size of code requires execution to see if it works. Too big to just use the eyeball.

I don't see how the posted code works without using an accept().
Here's a idea of how it could work:
server defines serversocket
begin loop
server calls accept() and waits for connect
client...

Where is the accept() method to wait for incoming connections?

I think that is possible.

I'm not sure what a WAR file is for. Do server hosting sites require that?

Your testing server code sounds like it needs a redesign. The accept logic should start a...

That sounds like a description of a protocol like http. With your own server you can define your own protocol.