Here you can find the source of long2ByteArray(long srcValue, int len)
public static byte[] long2ByteArray(long srcValue, int len) throws IllegalArgumentException
//package com.java2s; /* BioWebAuth (Biometrics for Web Authentication) is an open-source Java * framework intended to provide web authentication based on BioAPI-compliant * biometric software or devices./*w w w .j a v a2s. c o m*/ * * Copyright (c) 2005-2007 Elisardo Gonzalez Agulla <eli@gts.tsc.uvigo.es> * & Enrique Otero Muras <eotero@gts.tsc.uvigo.es> * * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ public class Main { public static byte[] long2ByteArray(long srcValue, int len) throws IllegalArgumentException { if (len != 2 && len != 4 && len != 6 && len != 8) throw new IllegalArgumentException("illegal length: " + len); byte[] tempBytes = new byte[len]; for (int i = 0; i < len; i++) { long tempValue = srcValue; tempValue >>= 8 * i; // tempBytes[len-i-1] = (byte)(tempValue & 0xFF); tempBytes[i] = (byte) (tempValue & 0xFF); } return tempBytes; } }