public class TestLengthFieldDecorder {

    public static void main(String[] args) {
        //这里相当于服务端接收数据
        EmbeddedChannel embeddedChannel = new EmbeddedChannel(
                new LengthFieldBasedFrameDecoder(1024, 0,
                        4, 0, 0),
                new LoggingHandler(LogLevel.DEBUG)
        );

        //这里相当于客户端发送数据
        ByteBuf buffer = ByteBufAllocator.DEFAULT.buffer();
        send(buffer, "Hello, World");
        send(buffer, "Hi!");
        embeddedChannel.writeInbound(buffer);

    }

    private static void send(ByteBuf buf, String content) {
        byte[] bytes = content.getBytes();
        int length = bytes.length;

        buf.writeInt(length);//int代表四个字节
        buf.writeBytes(bytes);
    }
}

 应该把数据中的长度剥离掉

new