one server multiple clients

Question

I am engaging the following problems:

1. I need to write a server program, will accept multiple clients
2. all clients are subscribing the same data from server

Answer 1

is it necessary to have a thread for each client socket?

No, as a matter of fact, I wouldn't even not recommend it. If it's a small project and you don't want to use any existing library, I would suggest you use the java.nio package and the SelectableChannels. With a so called selector you can easily monitor clients for incoming data in a non-blocking way.

Here are a few useful links:

• NIO Examples (from the official tutorial)
• The Rox Java NIO Tutorial