Java tutorial
//package com.java2s; public class Main { private static String bytes2hex(byte[] bytes) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < bytes.length; i++) { String hex = Integer.toHexString(bytes[i] & 0XFF); if (hex.length() == 1) { sb.append("0").append(hex); } else { sb.append(hex); } } return sb.toString(); } }