Here you can find the source of bytesToHexString(byte[] src)
public static String bytesToHexString(byte[] src)
//package com.java2s; //License from project: Apache License public class Main { public static String bytesToHexString(byte[] src) { StringBuilder stringBuilder = new StringBuilder(""); if (src == null || src.length <= 0) { return null; }//from w w w. j av a 2s. c o m 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); } String s = stringBuilder.toString(); StringBuilder s2 = new StringBuilder(""); for (int i = 0; i < s.length(); i++) { if (i != 0 && i % 2 == 0) { s2.append(" "); } s2.append(s.charAt(i)); } stringBuilder = null; return s2.toString(); } }