Gets byte array from a ByteBuffer in java

Question

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

User · Answer

Note that the bb array   doesn t honor the byte-buffers position  and might be even worse if the bytebuffer you are working on is a slice of some other buffer   I e   byte   test    Hello World  getBytes  Latin1    ByteBuffer b1   ByteBuffer wrap test   byte   hello   new byte 6   b1 get hello       Hello   ByteBuffer b2   b1 slice       position   0  string    World  byte   tooLong   b2 array       Will NOT be  World   but will be  Hello World   byte   world   new byte 5   b2 get world      world    World    Which might not be what you intend to do   If you really do not want to copy the byte-array  a work-around could be to use the byte-buffer s arrayOffset     remaining    but this only works if the application supports index length of the byte-buffers it needs

User · Answer

final ByteBuffer buffer  if  buffer hasArray          final byte   array   buffer array        final int arrayOffset   buffer arrayOffset        return Arrays copyOfRange array  arrayOffset   buffer position                                  arrayOffset   buffer limit          do something else

User · Answer

Depends what you want to do  If what you want is to retrieve the bytes that are remaining  between position and limit   then what you have will work  You could also just do  ByteBuffer bb      byte   b   new byte bb remaining     bb get b    which is equivalent as per the ByteBuffer javadocs

User · Answer

If one does not know anything about the internal state of the given  Direct ByteBuffer and wants to retrieve the whole content of the buffer  this can be used   ByteBuffer byteBuffer        byte   data   new byte byteBuffer capacity       ByteBuffer  byteBuffer duplicate   clear    get data

User · Answer

This is a simple way to get a byte    but part of the point of using a ByteBuffer is avoiding having to create a byte    Perhaps you can get whatever you wanted to get from the byte   directly from the ByteBuffer

User · Answer

As simple as that    private static byte   getByteArrayFromByteBuffer ByteBuffer byteBuffer        byte   bytesArray   new byte byteBuffer remaining         byteBuffer get bytesArray  0  bytesArray length       return bytesArray

[java] Gets byte array from a ByteBuffer in java

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