EmbeddedChannel

写完服务器端口，用EmbeddedChannel 模拟客户端测试
//encode

EmbeddedChannel channel = new EmbeddedChannel(new LoggingHandler(), new 自定义MessageCode());
channel.writeOutbound(new Entity());

//decode
ByteBuf buf = ByteBufAlloctor.DEFAULT.buffer();
new MessageCode().encode(null, new Entity(), buf)
channel.writeInbound(ByteBuf buf);