Netty 处理 TCP协议数据分包问题

public byte[] send(byte[] sendData) throws UnknownHostException, IOException {
		Socket socket = new Socket(serverIp, serverPort);
		OutputStream os = socket.getOutputStream();
		InputStream is = socket.getInputStream();
		byte resultArray[] = null;
		try {
			// 定义一个发送消息协议格式：|--header:4 byte--|--content:10MB--|
			// 获取一个4字节长度的协议体头
			byte[] dataLength = intToByteArray(4, sendData.length);
			// 和请求的数据组成一个请求数据包
			byte[] requestMessage = combineByteArray(dataLength, sendData);
			//发送数据-------------------------------
			os.write(requestMessage);
			os.flush();
			//接收数据-------------------------------
			resultArray = IOUtils.toByteArray(is);	
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			os.close();
			is.close();
			socket.close();
		}
		return resultArray;
	}

private static byte[] intToByteArray(int byteLength, int intValue) {
		return ByteBuffer.allocate(byteLength).putInt(intValue).array();
	}
private static byte[] combineByteArray(byte[] array1, byte[] array2) {
		byte[] combined = new byte[array1.length + array2.length];
		System.arraycopy(array1, 0, combined, 0, array1.length);
		System.arraycopy(array2, 0, combined, array1.length, array2.length);
		return combined;
	}

@Override
			public void initChannel(SocketChannel ch) throws Exception {
				ChannelPipeline pipeline = ch.pipeline();

				pipeline.addLast("framedecoder",new LengthFieldBasedFrameDecoder(1024*1024*1024, 0, 4,0,4));
				pipeline.addLast(new TCPServiceHandler());// 处理业务Handler
				

			}