Java ByteBuffer convert to byte array

import java.nio.ByteBuffer;
import java.util.Arrays;

public class Main {
  public static void main(String[] argv) throws Exception {
    byte[] byteArray = new byte[] { 65, 66, 67, 68, 69 };
    ByteBuffer bb = ByteBuffer.wrap(byteArray);

    byteArray = toArray(bb);// w w  w .ja  va 2 s . co  m

    System.out.println(Arrays.toString(byteArray));
  }

  public static byte[] toArray(final ByteBuffer buffer) {
    byte[] array = new byte[buffer.limit()];
    buffer.get(array);
    return array;
  }
}

import java.nio.ByteBuffer;
import java.util.Arrays;

public class Main {
  public static void main(String[] argv) throws Exception {
    byte[] byteArray = new byte[] { 65, 66, 67, 68, 69 };
    ByteBuffer bb = ByteBuffer.wrap(byteArray);

    byteArray = convertByteBufferToArray(bb);

    System.out.println(Arrays.toString(byteArray));
  }/*  ww w  .java  2 s. c  om*/

  public static byte[] convertByteBufferToArray(java.nio.ByteBuffer buf) {
    if (buf.hasArray()) {
      return buf.array();
    } else {
      buf.rewind();
      byte[] array = new byte[buf.remaining()];
      int index = 0;
      while (buf.hasRemaining()) {
        array[index++] = buf.get();
      }
      return array;
    }
  }
}

import java.nio.ByteBuffer;

public class Main {
    /**//from   w ww .  j  a  va  2 s  .  c o m
     * Reads an array of bytes from the given buffer
     * @param buffer Buffer containing the desired bytes
     * @param len length of the desired bytes
     * @return a new buffer with the given number of bytes from the current
     *         position in the given buffer
     */
    public static byte[] getBytes(ByteBuffer buffer, int len) {
        byte[] bytes = new byte[len];
        buffer.get(bytes);
        return bytes;
    }

    /**
     * Reads an array of bytes from the given buffer at the given offset
     * @param buffer Buffer containing the desired bytes
     * @param offset Offset at which to read the bytes
     * @param len length of the desired bytes
     * @return a new buffer with the given number of bytes from the given
     *         position in the given buffer
     */
    public static byte[] getBytes(ByteBuffer buffer, int offset, int len) {
        int origPos = buffer.position();
        try {
            buffer.position(offset);
            return getBytes(buffer, len);
        } finally {
            buffer.position(origPos);
        }
    }
}

/*
Copyright (c) 2005 Health Market Science, Inc.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
USA

You can contact Health Market Science at info@healthmarketscience.com
or at the following address:

Health Market Science
2700 Horizon Drive
Suite 200
King of Prussia, PA 19406
 */