Springboot+Netty 重写decoder实现十六进制收发

项目结构

1. 首先是服务器启动类，老生常谈了

    /**
    * @author sss
    * 服务器启动类
    */
    public class EchoServer {
    	private final int port;
    	private Logger log = LoggerFactory.getLogger(this.getClass());
    	public EchoServer(int port)
    	{
    		this.port=port;
    	}
   
    //启动服务器
    public void start() throws Exception{
   
    	EventLoopGroup bossGroup = new NioEventLoopGroup();
    	EventLoopGroup workerGroup = new NioEventLoopGroup();
   
    	try
    	{
        	ServerBootstrap b = new ServerBootstrap();
        	b.group(bossGroup, workerGroup)
                .localAddress(new InetSocketAddress(port))
                .childOption(ChannelOption.SO_KEEPALIVE, true) //2小时没有信息流则开启
                .option(ChannelOption.SO_BACKLOG, 1024)
                .channel(NioServerSocketChannel.class)
                .childHandler(new ChannelInitializer() {
                    @Override
                    protected void initChannel(SocketChannel ch) throws Exception {
                        //ch.pipeline().addLast(new ReadTimeoutHandler(5)); //5秒没有读事件就关掉
                        //ch.pipeline().addLast(new StringDecoder(CharsetUtil.UTF_8));
                        ch.pipeline().addLast(new MyDecoder());       //自定义的解码
                        ch.pipeline().addLast(new StringEncoder(CharsetUtil.UTF_8));
                        ch.pipeline().addLast(new TcpHandler());
                    }
                });
        ChannelFuture f=b.bind().sync();
        f.channel().closeFuture().sync();
    }
   
    finally {
        workerGroup.shutdownGracefully();
        bossGroup.shutdownGracefully();
   	 }
     }
    }
   

2、 重写decoder

	public class MyDecoder extends ByteToMessageDecoder {

	@Override
 	protected void decode(ChannelHandlerContext ctx, ByteBuf msg, List