Netty服务端代码:

package com.zqw.nio.netty.n1;

import org.jboss.netty.bootstrap.ServerBootstrap;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory;
import org.jboss.netty.handler.codec.string.StringDecoder;
import org.jboss.netty.handler.codec.string.StringEncoder;

import java.net.InetSocketAddress;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class Server2 {
    public static void main(String[] args) {
        ServerBootstrap bootstrap = new ServerBootstrap();
        ExecutorService boss = Executors.newCachedThreadPool();
        ExecutorService work = Executors.newCachedThreadPool();
        bootstrap.setFactory(new NioServerSocketChannelFactory(boss, work));
        bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
            @Override
            public ChannelPipeline getPipeline() throws Exception {
                ChannelPipeline channelPipeline = Channels.pipeline();
                channelPipeline.addLast("decoder", new StringDecoder());
                channelPipeline.addLast("encoder", new StringEncoder());
                channelPipeline.addLast("helloHandler", new HelloHandler2());
                return channelPipeline;
            }
        });
        bootstrap.bind(new InetSocketAddress(8000));
    }
}

package com.zqw.nio.netty.n1;

import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelStateEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelHandler;

public class HelloHandler2 extends SimpleChannelHandler {
    public HelloHandler2() {
        super();
    }

    @Override
    public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
        String s = (String) e.getMessage();
        System.out.println(s);
//        ChannelBuffer cb = ChannelBuffers.copiedBuffer("给你回话".getBytes());
        ctx.getChannel().write("给你回话");
        super.messageReceived(ctx, e);
    }

    @Override
    public void channelOpen(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
        super.channelOpen(ctx, e);
    }

    @Override
    public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
        super.channelConnected(ctx, e);
    }

    @Override
    public void channelDisconnected(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
        super.channelDisconnected(ctx, e);
    }

    @Override
    public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
        super.channelClosed(ctx, e);
    }
}