Here you can find the source of toBytes(String hexString)
public static byte[] toBytes(String hexString)
//package com.java2s; //License from project: Apache License public class Main { public static byte[] toBytes(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), 16).byteValue(); }/* w ww.ja v a 2s .c o m*/ return result; } }