ClientMsgPackEcho

public class ClientMsgPackEcho {
    private final String host;
    public ClientMsgPackEcho(String host) {
        this.host = host;
    }
    public void start() throws InterruptedException {
        EventLoopGroup group = new NioEventLoopGroup();/*线程组*/
        try {
            final Bootstrap b = new Bootstrap();;/*客户端启动必须*/
            b.group(group)/*将线程组传入*/
                    .channel(NioSocketChannel.class)/*指定使用NIO进行网络传输*/
                    /*配置要连接服务器的ip地址和端口*/
                    .remoteAddress(
                            new InetSocketAddress(host, ServerMsgPackEcho.PORT))
                    .handler(new ChannelInitializerImp());
            ChannelFuture f = b.connect().sync();
            System.out.println("已连接到服务器.....");
            f.channel().closeFuture().sync();
        } finally {
            group.shutdownGracefully().sync();
        }
    }
    private static class ChannelInitializerImp extends ChannelInitializer<Channel> {
        @Override
        protected void initChannel(Channel ch) throws Exception {
            /*告诉netty，计算一下报文的长度，然后作为报文头加在前面*/
            ch.pipeline().addLast(new LengthFieldPrepender(2));
            /*对服务器的应答也要解码，解决粘包半包*/
            ch.pipeline().addLast(new LineBasedFrameDecoder(1024));
            /*对我们要发送的数据做编码-序列化*/
           ch.pipeline().addLast(new MsgPackEncode());
           ch.pipeline().addLast(new MsgPackClientHandler(5));
        }
    }
    public static void main(String[] args) throws InterruptedException {
        new ClientMsgPackEcho("127.0.0.1").start();
    }
}