Get bytes from InputStream : Byte Array « File « Java Tutorial

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2. File
3. Byte Array

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

/*
 * The contents of this file are subject to the terms 
 * of the Common Development and Distribution License 
 * (the "License").  You may not use this file except 
 * in compliance with the License.
 * 
 * You can obtain a copy of the license at 
 * glassfish/bootstrap/legal/CDDLv1.0.txt or 
 * https://glassfish.dev.java.net/public/CDDLv1.0.html. 
 * See the License for the specific language governing 
 * permissions and limitations under the License.
 * 
 * When distributing Covered Code, include this CDDL 
 * HEADER in each file and include the License file at 
 * glassfish/bootstrap/legal/CDDLv1.0.txt.  If applicable, 
 * add the following below this CDDL HEADER, with the 
 * fields enclosed by brackets "[]" replaced with your 
 * own identifying information: Portions Copyright [yyyy] 
 * [name of copyright owner]
 */

/*
 * @(#)ASCIIUtility.java  1.10 05/08/29
 *
 * Copyright 1997-2005 Sun Microsystems, Inc. All Rights Reserved.
 */

public class Utils {

  public static byte[] getBytes(InputStream is) throws IOException {

    int len;
    int size = 1024;
    byte[] buf;

    if (is instanceof ByteArrayInputStream) {
      size = is.available();
      buf = new byte[size];
      len = is.read(buf, 0, size);
    } else {
      ByteArrayOutputStream bos = new ByteArrayOutputStream();
      buf = new byte[size];
      while ((len = is.read(buf, 0, size)) != -1)
        bos.write(buf, 0, len);
      buf = bos.toByteArray();
    }
    return buf;
  }


}