public class TcpServer {

 public static void main(String[] args) throws IOException {
   IoAcceptor acceptor = new NioSocketAcceptor();

   // 4字節(jié)的Header指定Body的字節(jié)數(shù)，對(duì)這種消息的處理
   acceptor.getFilterChain().addLast("codec",
       new ProtocolCodecFilter(new PrefixedStringCodecFactory(Charset.forName("UTF-8"))));

   acceptor.setHandler(new TcpServerHandle());
   acceptor.bind(new InetSocketAddress(8080));
 }

}

class TcpServerHandle extends IoHandlerAdapter {

 @Override
 public void exceptionCaught(IoSession session, Throwable cause)
     throws Exception {
   cause.printStackTrace();
 }

 // 接收到新的數(shù)據(jù)
 @Override
 public void messageReceived(IoSession session, Object message)
     throws Exception {

   String msg = (String) message;
   System.out.println("messageReceived:" + msg);

 }

 @Override
 public void sessionCreated(IoSession session) throws Exception {
   System.out.println("sessionCreated");
 }

 @Override
 public void sessionClosed(IoSession session) throws Exception {
   System.out.println("sessionClosed");
 }
}

public class TcpServer {

 public static void main(String[] args) throws InterruptedException {
   EventLoopGroup bossGroup = new NioEventLoopGroup();
   EventLoopGroup workerGroup = new NioEventLoopGroup();
   try {
     ServerBootstrap b = new ServerBootstrap();
     b.group(bossGroup, workerGroup)
         .channel(NioServerSocketChannel.class)
         .childHandler(new ChannelInitializer<SocketChannel>() {
           @Override
           public void initChannel(SocketChannel ch)
               throws Exception {
             ChannelPipeline pipeline = ch.pipeline();

             // LengthFieldBasedFrameDecoder按行分割消息，取出body
             pipeline.addLast(new LengthFieldBasedFrameDecoder(80, 0, 4, 0, 4));
             // 再按UTF-8編碼轉(zhuǎn)成字符串
             pipeline.addLast(new StringDecoder(CharsetUtil.UTF_8));

             pipeline.addLast(new TcpServerHandler());
           }
         });
     ChannelFuture f = b.bind(8080).sync();
     f.channel().closeFuture().sync();
   } finally {
     workerGroup.shutdownGracefully();
     bossGroup.shutdownGracefully();
   }
 }

}

class TcpServerHandler extends ChannelInboundHandlerAdapter {

 // 接收到新的數(shù)據(jù)
 @Override
 public void channelRead(ChannelHandlerContext ctx, Object msg) {

   String message = (String) msg;
   System.out.println("channelRead:" + message);
 }

 @Override
 public void channelActive(ChannelHandlerContext ctx) {
   System.out.println("channelActive");
 }

 @Override
 public void channelInactive(ChannelHandlerContext ctx) {
   System.out.println("channelInactive");
 }

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

# -*- coding:utf-8 –*-

from twisted.protocols.basic import Int32StringReceiver
from twisted.internet.protocol import Factory
from twisted.internet import reactor

class TcpServerHandle(Int32StringReceiver):

   # 新的連接建立
   def connectionMade(self):
       print 'connectionMade'

   # 連接斷開(kāi)
   def connectionLost(self, reason):
       print 'connectionLost'

   # 接收到新的數(shù)據(jù)
   def stringReceived(self, data):
       print 'stringReceived:' + data

factory = Factory()
factory.protocol = TcpServerHandle
reactor.listenTCP(8080, factory)
reactor.run()

public class TcpClient {

 public static void main(String[] args) throws IOException {

   Socket socket = null;
   DataOutputStream out = null;

   try {

     socket = new Socket("localhost", 8080);
     out = new DataOutputStream(socket.getOutputStream());

     // 請(qǐng)求服務(wù)器
     String data1 = "牛頓";
     byte[] outputBytes1 = data1.getBytes("UTF-8");
     out.writeInt(outputBytes1.length); // write header
     out.write(outputBytes1); // write body

     String data2 = "愛(ài)因斯坦";
     byte[] outputBytes2 = data2.getBytes("UTF-8");
     out.writeInt(outputBytes2.length); // write header
     out.write(outputBytes2); // write body

     out.flush();

   } finally {
     // 關(guān)閉連接
     out.close();
     socket.close();
   }

 }

}

sessionCreated

messageReceived:牛頓

messageReceived:愛(ài)因斯坦

sessionClosed

channelActive

channelRead:牛頓

channelRead:愛(ài)因斯坦

channelInactive

connectionMade

stringReceived:牛頓

stringReceived:愛(ài)因斯坦

connectionLost