Java tutorial
//package com.java2s; public class Main { private static final char[] HEX_DIGITS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; public static String getHexText(byte[] mdByte) { int len = mdByte.length; StringBuilder sb = new StringBuilder(len * 2); for (int i = 0; i < len; i++) { sb.append(HEX_DIGITS[(mdByte[i] >> 4) & 0x0f]); } return sb.toString(); } }