public static void main(String[] args) {
  int port = 2222;
  new NettyHttpServer().run(port);
}

public void run(int port) {
  EventLoopGroup bossGroup = new NioEventLoopGroup();
  EventLoopGroup workerGroup = new NioEventLoopGroup();
  ServerBootstrap bootstrap = new ServerBootstrap();
  bootstrap.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class)
      .childHandler(new ChannelInitializer<SocketChannel>() {
        @Override
        public void initChannel(SocketChannel ch) throws Exception {
            ch.pipeline().addLast(
                new HttpResponseEncoder(),
                new HttpRequestDecoder(),
                new NettyHttpServerHandler());
        }
        }).option(ChannelOption.SO_BACKLOG, 128)
        .childOption(ChannelOption.SO_KEEPALIVE, true);
  try {
    ChannelFuture f = bootstrap.bind(port).sync();
    f.channel().closeFuture().sync();
  } catch (InterruptedException e) {
    e.printStackTrace();
  } finally {
    workerGroup.shutdownGracefully();
    bossGroup.shutdownGracefully();
  }
}

public class NettyHttpServerHandler extends ChannelInboundHandlerAdapter {

  @Override
  public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {  
    FullHttpResponse response = new DefaultFullHttpResponse(
        HttpVersion.HTTP_1_1, 
        HttpResponseStatus.OK,
        Unpooled.wrappedBuffer("歡迎來到猿天地".getBytes("utf-8")));
    response.headers().set(Names.CONTENT_TYPE, "text/plain;charset=UTF-8");
    response.headers().set(Names.CONTENT_LENGTH, response.content().readableBytes());
    response.headers().set(Names.CONNECTION, Values.KEEP_ALIVE);
    ctx.write(response);
    ctx.flush();
  }

  @Override
  public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
    ctx.flush();
  }

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

}

if (msg instanceof HttpRequest) {
    DefaultHttpRequest request = (DefaultHttpRequest) msg;
    System.out.println("URI:" + request.getUri());
    System.err.println(msg);
}
if (msg instanceof HttpContent) {
    LastHttpContent httpContent = (LastHttpContent) msg;
    ByteBuf byteData = httpContent.content();
    if (byteData instanceof EmptyByteBuf) {
      System.out.println("Content：無數(shù)據(jù)");
    } else {
      String content = new String(ByteUtils.objectToByte(byteData));
      System.out.println("Content:" + content);
    }
}