Java : Quartz scheduler - is there a way I can get next five runs of a scheduled job

Question

是否有任何 API 可以提供接下来的 n 次 cron 表达式运行。

Answer 1

您可以这样计算下一次运行时间:

import org.springframework.scheduling.support.CronTrigger;
import org.springframework.scheduling.support.SimpleTriggerContext;

public static void main(String[] args) {
    CronTrigger trigger = new CronTrigger("0 0 10 * * ?");
    SimpleTriggerContext triggerContext = new SimpleTriggerContext();
    Date testDate = new Date();
    int i = 0;
    while (i++ < 5) {
        triggerContext.update(null, null, testDate);
        testDate = trigger.nextExecutionTime(triggerContext);
        System.out.println(testDate);
    }
}

输出是:

    Wed Jun 05 10:00:00 CEST 2019
    Thu Jun 06 10:00:00 CEST 2019
    Fri Jun 07 10:00:00 CEST 2019
    Sat Jun 08 10:00:00 CEST 2019
    Sun Jun 09 10:00:00 CEST 2019