Here you can find the source of base64Encode(byte[] bytes)
public static String base64Encode(byte[] bytes)
//package com.java2s; /* Copyright (c) 1996-2015, OPC Foundation. All rights reserved. The source code in this file is covered under a dual-license scenario: - RCL: for OPC Foundation members in good-standing - GPL V2: everybody else//from w ww . ja va 2s . com RCL license terms accompanied with this source code. See http://opcfoundation.org/License/RCL/1.00/ GNU General Public License as published by the Free Software Foundation; version 2 of the License are accompanied with this source code. See http://opcfoundation.org/License/GPLv2 This source code 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. */ import sun.misc.BASE64Encoder; public class Main { public static String base64Encode(byte[] bytes) { // See above: base64Decode // return javax.xml.bind.DatatypeConverter.printBase64Binary(bytes); BASE64Encoder bd = new BASE64Encoder(); return bd.encode(bytes); } }