public static void main(String[] args)  {

    try {
        //获取第二天的零时的时间戳
        long now = System.currentTimeMillis() / 1000l;
        long daySecond = 60 * 60 * 24;
        long dayTime = now +(86400- (now + 8 * 3600) % daySecond);
        System.out.println(dayTime);


        //获取今天的时间戳
        Date date = new Date();
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
        String today = simpleDateFormat.format(date.getTime());
        System.out.println("当天日期" + today);

        //1、当天凌晨(毫秒)
        long daytime1 = simpleDateFormat.parse(today).getTime();
        System.out.println("1、当天凌晨(毫秒)" + daytime1);

        //2、当天凌晨(毫秒)
        long current = System.currentTimeMillis();
        long daytime2 = current-(current+ TimeZone.getDefault().getRawOffset())%(1000*3600*24);
        System.out.println("2、当天凌晨(毫秒)" + daytime2);

        //3、当天凌晨(毫秒)
        Calendar c = Calendar.getInstance();
        //当天24时
        c.set(Calendar.HOUR_OF_DAY, 24);
        //当天0时
        //c.set(Calendar.HOUR_OF_DAY, 0);
        c.set(Calendar.MINUTE, 0);
        c.set(Calendar.SECOND, 0);
        c.set(Calendar.MILLISECOND, 0);
        long daytime3 = c.getTimeInMillis();
        System.out.println("3、当天凌晨(毫秒)" + daytime3);

        //4、当天凌晨(毫秒)
        long now1 = System.currentTimeMillis() / 1000l;
        long daySecond1 = 60 * 60 * 24;
        long dayTime4 = (now1 - (now1 + 8 * 3600) % daySecond1) * 1000 ;
        System.out.println("4、当天凌晨(毫秒)" + dayTime4);
    } catch (ParseException e) {
        e.printStackTrace();
    }


}