Convert ByteBuffer to byte array java

java arrays bytebuffer
Powisss picture Powisss · Feb 26, 2015 · Viewed 68.8k times · Source

Does anyone know how to convert ByteBuffer to byte[] array? I need to get byte array from my ByteBuffer. When I run bytebuffer.hasArray() it returns no. Every question I looked so far is converting byte array to byteBuffer, but I need it other way around. Thank you.

Answer

nomis picture nomis · Feb 26, 2015

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);

Related questions

Gets byte array from a ByteBuffer in java

Is this the recommended way to get the bytes from the ByteBuffer ByteBuffer bb =.. byte[] b = new byte[bb.remaining()] bb.get(b, 0, b.length);

Read More
How to create ByteArrayInputStream from a file in Java?

I have a file that can be any thing like ZIP, RAR, txt, CSV, doc etc. I would like to create a ByteArrayInputStream from it. I'm using it to upload a file to FTP through FTPClient from Apache Commons Net. …

Read More
How to convert a String array to a Byte array? (java)

I have a one dimensional String array that I want to convert into a one dimensional byte array. How do I do this? Does this require ByteBuffer? How can I do this? (The strings can be any length, just want …

Read More