唯一ID 時間戳+6位隨機數

public static String getDate() {
        Date currentTime = new Date();
        SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMddhhmmss");
        String dateString = formatter.format(currentTime);
        StringBuilder str = new StringBuilder();
        Random random = new Random();
        for (int i = 0; i < 6; i++) {
            str.append(random.nextInt(10));
        }
        return dateString+str.toString();
    }