Here you can find the source of bytes2Hex(byte[] bytes)
public static String bytes2Hex(byte[] bytes)
//package com.java2s; /*/* w w w. j a v a2 s . c om*/ * Copyright 2002-2015 by bafeimao.net * * 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. */ public class Main { private static final char[] HEX_CHARS = "0123456789abcdef".toCharArray(); public static String bytes2Hex(byte[] bytes) { if (bytes == null) { return null; } final StringBuilder hexBuilder = new StringBuilder(2 * bytes.length); for (final byte b : bytes) { hexBuilder.append(HEX_CHARS[(b & 0xF0) >> 4]).append(HEX_CHARS[b & 0x0F]); } return hexBuilder.toString(); } }