Here you can find the source of toHexString(final byte[] bytes)
public static String toHexString(final byte[] bytes)
//package com.java2s; /*/*from w ww.j a va 2 s. c o m*/ * (C) 2007-2012 Alibaba Group Holding Limited. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * Authors: * wuhua <wq163@163.com> , boyan <killme2008@gmail.com> */ public class Main { public static String toHexString(final byte[] bytes) { final StringBuffer sb = new StringBuffer(); for (final byte b : bytes) { byte2hex(b, sb); } return sb.toString(); } public static void byte2hex(final byte b, final StringBuffer buf) { final char[] hexChars = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' }; final int high = (b & 0xf0) >> 4; final int low = b & 0x0f; buf.append(hexChars[high]); buf.append(hexChars[low]); } }