例如socketChannel.write(ByteBuffer) buteBuffer的长度可能随时变更，但是接收的时候read方法是以一个固定的长度接收的

发送方

byte[] outData = new byte[2048];
ByteBuffer outByteBuffer = ByteBuffer.wrap(outData);
toWriteNrBytes = 获取数据返回一个长度；
outByteBuffer.limit(toWriteNrBytes);
socketChannel.write(outByteBuffer);

接收方

byte[] inData = new byte[2048];
ByteBuffer inByteBuffer = ByteBuffer.wrap(inData);
readNrBytes = socketChannel.read(inByteBuffer);

可是这个readNrBytes并不能实时的到每次写入的长度，请问怎么解决