根据日期获取24位随机数

/**根据日期获取24位随机数*/
 public static String getPkid() {
        StringBuilder stringBuilder = new StringBuilder();
        stringBuilder.append(getDateTimeNoGap());
        int hashCode = UUID.randomUUID().toString().hashCode();
        if (hashCode < 0) {
            hashCode = -hashCode;
        }
        String str = String.format("%010d", hashCode);
        stringBuilder.append(str);
        return stringBuilder.toString();
    }
    /**
     * 日期时间生产源
     *
     * @param format
     * @return
     */
    public static String dateTime(String format) {
        Date date = null;
        SimpleDateFormat sdf = null;
        try {
            date = new Date();
            sdf = new SimpleDateFormat(format);
            return sdf.format(date);
        } catch (Exception e) {
            return null;
        } finally {
            date = null;
            sdf = null;
        }
    }
    public static String getDateTimeNoGap() {
        return dateTime("yyyyMMddHHmmss");
    }