Java tutorial
//package com.java2s; public class Main { public static String bytesToHexString(byte[] bArray) { if (bArray == null) { return null; } if (bArray.length == 0) { return ""; } StringBuffer sb = new StringBuffer(bArray.length); String sTemp; for (int i = 0; i < bArray.length; i++) { sTemp = Integer.toHexString(0xFF & bArray[i]); if (sTemp.length() < 2) sb.append(0); sb.append(sTemp.toUpperCase()); } return sb.toString(); } }