如何获得下一个运行时间Spring Scheduling？

Question

我正在做一个计划项目，该项目定期执行多个作业。我正在使用cron调度，如下例所示。作业已成功执行，没有问题。但是，出于需求，我想计算并保留DB中计划作业的下一次运行时间。对于以下配置，是否有解决方案来获取作业的上一次和下一次启动时间？

配置示例：

import java.util.Date;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.scheduling.support.CronTrigger;
import org.springframework.stereotype.Component;

@Component
@EnableScheduling
public class DemoServiceBasicUsageCron
{   
    @Scheduled(cron="1,3,30,32 * * * * ?")
    public void demoServiceMethod()
    {
        System.out.println("Curent date time is - "+ new Date());
    }

}

Answer 1

您可以使用CronSequenceGenerator。

import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.scheduling.support.CronSequenceGenerator;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import java.util.Date;

@Component
public class MyJob {

    public static final String CRON_EXPRESSION = "0 0 5 * * *";

    @PostConstruct
    public void init() {
        CronSequenceGenerator cronTrigger = new CronSequenceGenerator(CRON_EXPRESSION);
        Date next = cronTrigger.next(new Date());

        System.out.println("Next Execution Time: " + next);
    }

    @Scheduled(cron = CRON_EXPRESSION)
    public void run() {
        // Your custom code here
    }
}