Does anyone know how to convert ByteBuffer to byte[] array? I need to get byte array from my ByteBuffer. When I run bytebuffer.hasArrray() it returns no. Every question I looked so far is converting byte array to byteBuffer, but I need it other way around.
Thank you.
ByteBuffer exposes the bulk get(byte[]) method which transfers bytes from the buffer into the array. You'll need to instantiate an array of length equal to the number of remaining bytes in the buffer.
ByteBuffer buf = ...
byte[] arr = new byte[buf.remaining()];
buf.get(arr);
If hasArray() reports false then, calling array() will throw an exception.
In that case, the only way to get the data in a byte[] is to allocate a byte[] and copy the bytes to the byte[] using get(byte) or similar.
来源：https://stackoverflow.com/questions/28744096/convert-bytebuffer-to-byte-array-java