Here you can find the source of byteToHexStr(byte buf[])
public static String byteToHexStr(byte buf[])
//package com.java2s; public class Main { public static String byteToHexStr(byte buf[]) { StringBuffer sb = new StringBuffer(); for (int i = 0; i < buf.length; i++) { String hex = Integer.toHexString(buf[i] & 0xFF); if (hex.length() == 1) { hex = '0' + hex; }//from www.ja v a 2s . c om sb.append(hex); } return sb.toString(); } }