Java tutorial
//package com.java2s; public class Main { public static final String bytesToHexString(byte[] bArray) { StringBuffer sb = null; String sTemp; if (bArray == null || bArray.length <= 0) { return null; } sb = new StringBuffer(bArray.length); 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(); } }