What is the best way to organize the Java TCP multi-threaded server protocol and how to organize sessions to associate resources with each connection?

Question

Java

I read the Internet, simple implementations of protocols are shown (rules for processing sockets and data), I want to know how best to process sockets?
To be more clear, there is a Server socket waiting for sockets, then it delegates all the work to the new child thread. This main thread exchanges objects in the same way as on the client. In addition, the client can send files over the socket.
How can I make it so that I can perform multitasking via a socket (sending objects and transferring files), despite the fact that they do not overlap, but are a logical part of each connection (Session)

Answer 1

Maybe you need HTTP and Tomcat? All of the above is there.