小编Jak*_*llo的帖子

我使用 LocalDateTime.now()在Java 8 中获得 LocalDateTime 。但有时这个 now() 函数以没有秒的格式返回时间给我。我认为这是因为秒为零，但我需要秒。

代码：

List <LocalDateTime> times = Arrays.asList(
                                 LocalDateTime.now(),
                                 LocalDateTime.parse("2020-09-13T20:53", DateTimeFormatter.ISO_LOCAL_DATE_TIME),
                                 LocalDateTime.parse(LocalDateTime.now().format(DateTimeFormatter.ISO_LOCAL_DATE_TIME))
                             );

for (LocalDateTime time: times)
    System.out.println("Time: " + time);

安慰：

Time: 2020-09-13T18:42:25.775
Time: 2020-09-13T20:53
Time: 2020-09-13T18:42:25.779

Time: 2020-09-13T20:53 已经没有秒了。

PD：我有一个调度程序，它每 30 秒运行一次“LocalDatetime.now ()”。这是它在控制台中显示的内容。

2020-09-10T09:14:00.001
2020-09-10T09:14:30.001
2020-09-10T09:15:00.001
2020-09-10T09:15:30.001
2020-09-10T09:16:00.001
2020-09-10T09:16:30
2020-09-10T09:17
2020-09-10T09:17:30.001
2020-09-10T09:18:00.001
2020-09-10T09:18:30
2020-09-10T09:19:00.001
2020-09-10T09:19:30.001
2020-09-10T09:20:00.001
2020-09-10T09:20:30
2020-09-10T09:21:00.001
2020-09-10T09:21:30
2020-09-10T09:22:00.001
2020-09-10T09:22:30.001
2020-09-10T09:23
2020-09-10T09:23:30.001
2020-09-10T09:24
2020-09-10T09:24:30
2020-09-10T09:25
2020-09-10T09:25:30
2020-09-10T09:26:00.001
2020-09-10T09:26:30