Here you can find the source of bytesToHexString(byte data[])
private static String bytesToHexString(byte data[])
//package com.java2s; /*//from w w w .j av a 2 s .c o m * Copyright (C) 2008 John-Paul.Stanford <dev@stanwood.org.uk> * * 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 { private final static char HEX_DIGITS[] = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; private static String bytesToHexString(byte data[]) { StringBuilder sb = new StringBuilder(data.length * 2); for (int buc = 0; buc < data.length; buc++) { sb.append(HEX_DIGITS[(data[buc] >> 4) & 0x0F]); sb.append(HEX_DIGITS[data[buc] & 0x0F]); } return sb.toString(); } }