Tuto-1

ServerBootstrap bootstrap = new ServerBootstrap(
                new NioServerSocketChannelFactory(
                Executors.newCachedThreadPool(),
                Executors.newCachedThreadPool()));
         // Set up the pipeline factory.
         bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
             public ChannelPipeline getPipeline() throws Exception {
                return Channels.pipeline(new ConectionHandler());
             }
         });

         // Bind and start to accept incoming connections.
         bootstrap.bind(new InetSocketAddress(mPort));