Here you can find the source of toByteArray(String hex)
public static byte[] toByteArray(String hex)
//package com.java2s; /*/*from ww w.j ava 2 s .co m*/ * $Header: Util.java, 14-Jul-2005 03:27:51 luisantonioa Exp $ * * $Author: luisantonioa $ $Date: 14-Jul-2005 03:27:51 $ $Revision: 1 $ $Log: * Util.java,v $ Revision 1 14-Jul-2005 03:27:51 luisantonioa Added copyright * notice * * * This program is free software: you can redistribute it and/or modify it under * the terms of the GNU General Public License as published by the Free Software * Foundation, either version 3 of the License, or (at your option) any later * version. * * This program 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 General Public License for more * details. * * You should have received a copy of the GNU General Public License along with * this program. If not, see <http://www.gnu.org/licenses/>. */ public class Main { public static byte[] toByteArray(String hex) { int len = (hex.length() + 1) / 3; byte[] data = new byte[len]; for (int i = 0; i < len; i++) { data[i] = (byte) ((Character.digit(hex.charAt(i * 3), 16) << 4) + Character.digit(hex.charAt(i * 3 + 1), 16)); } return data; } }