如何从初始LocalDateTime和cron表达式中获取下一个LocalDateTime? [英] How to get the next LocalDateTime from an initial LocalDateTime and a cron expression?

问题描述

我有一个初始日期和一个cron表达式.我怎么能找到满足该cron表达式的下一个日期?.

I have an initial date and a cron expression. How could I find the next date satisfying this cron expression ?.

    String cronExpresion = "* * * * * *"
    LocalDateTime initial = LocalDateTime.now()
    LocalDateTime next = ?

我尝试了CronSequenceGenerator及其 next()方法，但是它使用java.util.Date，我不希望不将LocalDateTime转换为Date，反之亦然.另外，我得到了几次不同的结果(两个日期之间的时间)，如每10秒"这样的cron运行...

I tried CronSequenceGenerator and its next() method but it uses java.util.Date and I would prefer not to convert LocalDateTime to Date and vice versa. Plus, I've got different result (time between the 2 dates) from several run with a cron like 'every 10 secondes' ...

有什么主意吗?lib吗?

Any idea ? lib ?

推荐答案

欧姆尼克龙( https://github.com/intelie/omnicron )似乎至少满足了您的某些要求:

Omnicron (https://github.com/intelie/omnicron) seems to satisfy at least some of your requirements:

Cron cron = new Cron("*/5 * * * *");
ZonedDateTime date = ZonedDateTime.now();

System.out.println("Next execution: " + cron.next(date));
System.out.println("Prev execution: " + cron.prev(date));

(Cron :: next和Cron :: prev接受任何时间值，而不仅仅是ZonedDateTime.)

(Cron::next and Cron::prev accept any Temporal value, not just ZonedDateTime.)

除此之外，Omnicron还与Spring的CronSequenceGenerator(

Aside from that, Omnicron is, as a bonus, compatible with Spring's CronSequenceGenerator (https://github.com/intelie/omnicron/blob/master/src/test/java/net/intelie/omnicron/SpringCompatibilityTest.java)

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