String和Date转换

        Date date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String dateTime = sdf.format(date);

        String dateTime = "2019-01-01 01:01:01";
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        try {
            Date date = sdf.parse(dateTime);
        } catch (ParseException e) {
            e.printStackTrace();
        }