code: private static String byteToStr(byte[] byteArray) {
          int len = byteArray.length;
          StringBuilder strDigest = new StringBuilder(len * 2);
          for (byte aByteArray : byteArray) {
              strDigest.append(byteToHexStr(aByteArray));
          }
          return strDigest.toString();
      }
docs: 将byte数组变为16进制对应的字符串
  
  @param byteArray byte数组
  @return 转换结果