JBoss Netty

The Netty project provides an asynchronous event-driven network application framework and tooling for the rapid development of maintainable high-performance high-scalability protocol servers and clients.

So, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server development.

Here is a simple demo that used the Netty build a server, also a client include. They will send and receive a constant string between them. Here is the screen-shot.

The full source code could be found from here.