Here you can find the source of fromHex(String string)
public static byte[] fromHex(String string)
//package com.java2s; /**//from ww w . ja v a 2 s .com * * #%L * geoserver-sync-core * $Id:$ * $HeadURL:$ * %% * Copyright (C) 2013 Moebius Solutions Inc. * %% * 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 2 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/gpl-2.0.html>. * #L% * */ public class Main { public static byte[] fromHex(String string) { if ((string.length() & 1) != 0) { throw new IllegalArgumentException("String length must be even"); } int rl = string.length() / 2; byte[] result = new byte[rl]; for (int i = 0; i < rl; i++) { String hex = string.substring(i * 2, i * 2 + 2); result[i] = (byte) Integer.parseInt(hex, 16); } return result; } }