Java8中Date转换LocalDateLocalDate转换DateDate转换LocalDateTime

Posted 2021-09-07 Acmen-zym

    @Test
    public void timeTest() {
        Date date = new Date();
        //date转换为localDateTime
        LocalDateTime localDateTime = LocalDateTime.ofInstant(date.toInstant(), ZoneId.systemDefault());
        System.out.println("localDateTime = " + localDateTime);
        //date转换为localDate
        LocalDateTime localDateTime2 = LocalDateTime.ofInstant(date.toInstant(), ZoneId.systemDefault());
        LocalDate localDate = localDateTime2.toLocalDate();
        System.out.println("localDate = " + localDate);
        //localDate转换为date
        Date fromDate = Date.from(localDate.atStartOfDay(ZoneId.systemDefault()).toInstant());
        //此方法是自己实现将Date转换成字符串的封装方法,不进行展示了。测试的话可以使用Java自带的SimpleDateFormat进行处理
        String ymdHmsStr = DateTimeUtil.getYmdStr(fromDate);
        System.out.println("ymdHmsStr = " + ymdHmsStr);
    }

运行效果图