FixedLengthEchoClient

public class FixedLengthEchoClient {
    public final static String REQUEST = "Mark,Lison,Peter,James,Deer";
    private final String host;
    public FixedLengthEchoClient(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*/
                    .remoteAddress(new InetSocketAddress(host,FixedLengthEchoServer.PORT))/*配置要连接服务器的ip地址和端口*/
                    .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 {
            ch.pipeline().addLast(
                    new FixedLengthFrameDecoder(
                            FixedLengthEchoServer.RESPONSE.length()));
            ch.pipeline().addLast(new FixedLengthClientHandler());
        }
    }
    public static void main(String[] args) throws InterruptedException {
        new FixedLengthEchoClient("127.0.0.1").start();
    }
}