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