Here you can find the source of encodeHexStr(final byte[] bytes)
public static String encodeHexStr(final byte[] bytes)
//package com.java2s; /*/*from w ww .j a v a 2 s .co m*/ * Copyright 1999-2101 Alibaba Group. * * 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 { public static final char[] digital = "0123456789ABCDEF".toCharArray(); public static String encodeHexStr(final byte[] bytes) { if (bytes == null) { return null; } char[] result = new char[bytes.length * 2]; for (int i = 0; i < bytes.length; i++) { result[i * 2] = digital[(bytes[i] & 0xf0) >> 4]; result[i * 2 + 1] = digital[bytes[i] & 0x0f]; } return new String(result); } }