Java使用OTP动态口令（每分钟变一次）进行登录认证

String secretBase32 = TotpUtil.getRandomSecretBase32(64);
oper.setOtpSk(secretBase32);

String totpProtocalString = TotpUtil.generateTotpString(operCode, host, secretBase32);

String host = "otptest@wjs.com"; // 自定义

   String totpProtocalString = TotpUtil.generateTotpString(operCode, host, secretBase32);

   String filePath = f_temp;
   String fileName = Long.toString(System.currentTimeMillis()) + ".png";
   
   try{
    QRUtil.generateMatrixPic(totpProtocalString, 150, 150, filePath, fileName);
   }catch (Exception e){
    throw new RuntimeException("生成二维码图片失败:" + e.getMessage());
   }


   String content = "用户名："+operCode+"</br>"
     +"系统使用密码 + 动态口令双因素认证的方式登录。</br>请按以下方式激活手机动态口令：</br>安卓用户请点击<a href='http://otp.aliyun.com/updates/shenfenbao.apk'>下载</a>，"
     +"</br>苹果手机在AppStore中搜索【身份宝】（Alibaba）。下载安装后，通过扫描以下二维码激活动态口令。</br>"
     +"<img src=\"cid:image\">";
   EmailBaseLogic emailBaseLogic = new EmailBaseLogic();
//   String to, String title, String content, String imagePath
   emailBaseLogic.sendWithPic(email,"账户开立通知", content, filePath + "/" + fileName);

String secretHex = "";
  try {
   secretHex = HexEncoding.encode(Base32String.decode(secretBase32));
  } catch (Base32String.DecodingException e) {
   LOGGER.error("解码" + secretBase32 + "出错，", e);
   throw new RuntimeException("解码Base32出错");
  }

  long X = 30;

  String steps = "0";
  DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
  df.setTimeZone(TimeZone.getTimeZone("UTC"));

  long currentTime = System.currentTimeMillis() / 1000L;
  try {
   long t = currentTime / X;
   steps = Long.toHexString(t).toUpperCase();
   while (steps.length() < 16) steps = "0" + steps;

   return generateTOTP(secretHex, steps, "6",
     "HmacSHA1");
  } catch (final Exception e) {
   LOGGER.error("生成动态口令出错：" + secretBase32, e);
   throw new RuntimeException("生成动态口令出错");
  }