Here you can find the source of toByte(String hexString)
public static byte[] toByte(String hexString)
//package com.java2s; public class Main { public static byte[] toByte(String hexString) { int len = hexString.length() / 2; byte[] result = new byte[len]; for (int i = 0; i < len; i++) result[i] = Integer.valueOf( hexString.substring(2 * i, 2 * i + 2)).byteValue(); return result; }//w w w.ja v a 2s . co m }