Netty、MINA、Twisted一起學系列02：TCP訊息邊界問題及按行分割訊息

public class TcpServer {

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

    // 新增一個Filter，用於接收、傳送的內容按照"\r\n"分割
    acceptor.getFilterChain().addLast("codec",
        new ProtocolCodecFilter(new TextLineCodecFactory(Charset.forName("UTF-8"), "\r\n", "\r\n")));

    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();
  }

  // 接收到新的資料
  @Override
  public void messageReceived(IoSession session, Object message)
      throws Exception {

    // 接收客戶端的資料，這裡接收到的不再是IoBuffer型別，而是字串
    String line = (String) message;
    System.out.println("messageReceived:" + line);

  }

  @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();

              // LineBasedFrameDecoder按行分割訊息
              pipeline.addLast(new LineBasedFrameDecoder(80));
              // 再按UTF-8編碼轉成字串
              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 {

  // 接收到新的資料
  @Override
  public void channelRead(ChannelHandlerContext ctx, Object msg) {

    // msg經過StringDecoder後型別不再是ByteBuf而是String
    String line = (String) msg;
    System.out.println("channelRead:" + line);
  }

  @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 LineOnlyReceiver
from twisted.internet.protocol import Factory
from twisted.internet import reactor

class TcpServerHandle(LineOnlyReceiver):

    # 新的連線建立
    def connectionMade(self):
        print 'connectionMade'

    # 連線斷開
    def connectionLost(self, reason):
        print 'connectionLost'

    # 接收到新的一行資料
    def lineReceived(self, data):
        print 'lineReceived:' + 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;
    OutputStream out = null;

    try {

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

      // 請求伺服器
      String lines = "床前明月光\r\n疑是地上霜\r\n舉頭望明月\r\n低頭思故鄉\r\n";
      byte[] outputBytes = lines.getBytes("UTF-8");
      out.write(outputBytes);
      out.flush();

    } finally {
      // 關閉連線
      out.close();
      socket.close();
    }

  }

}

sessionCreated

messageReceived:床前明月光

messageReceived:疑是地上霜

messageReceived:舉頭望明月

messageReceived:低頭思故鄉

sessionClosed

channelActive

channelRead:床前明月光

channelRead:疑是地上霜

channelRead:舉頭望明月

channelRead:低頭思故鄉

channelInactive

connectionMade

lineReceived:床前明月光

lineReceived:疑是地上霜

lineReceived:舉頭望明月

lineReceived:低頭思故鄉

connectionLost