Here you can find the source of toHexString(byte[] src)
private static String toHexString(byte[] src)
//package com.java2s; //License from project: Open Source License public class Main { private static String toHexString(byte[] src) { StringBuilder stringBuilder = new StringBuilder(); if (src == null || src.length <= 0) { return null; }// w w w . j a v a 2 s. com for (int i = 0; i < src.length; i++) { int v = src[i] & 0xFF; String hv = Integer.toHexString(v); if (hv.length() < 2) { stringBuilder.append(0); } stringBuilder.append(hv); } return stringBuilder.toString(); } }