NettyConnectionHandler.java

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;

/**
 * Handles a client-side channel.
 */
public class NettyConnectionHandler  extends SimpleChannelInboundHandler<String> {

    public void messageReceived(ChannelHandlerContext ctx, String msg) {
        System.err.println(msg);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        cause.printStackTrace();
        ctx.close();
    }

	@Override
	protected void channelRead0(ChannelHandlerContext ctx, String msg)
			throws Exception {
		System.out.println(msg);
		
	}
}