java - java Quartz2 cron触发器没有立即触发

Question

当我调用调度程序时，我需要立即执行调度程序，下次它将根据 cron 表达式执行。但是在这里我的代码仅在 10 分钟后执行，但在我运行此类/应用程序时未执行。

QuartzConfigure.java用于注册和调用执行方法：

public class QuartzConfigure {

    public static void main(String args[]) throws Exception {
        // specify the job' s details..
        JobDetail job = JobBuilder.newJob(QuartzSchduleJob.class)
                                  .withIdentity("testJob")
                                  .build();

        //this is specify using chron expression using chrone expression
        Trigger trigger = TriggerBuilder.newTrigger().withIdentity("Group2")
            .withSchedule(CronScheduleBuilder.cronSchedule("0 /10 * * * ?"))
            .startNow().build();

        //schedule the job
        SchedulerFactory schFactory = new StdSchedulerFactory();
        Scheduler sch = schFactory.getScheduler();
        sch.start();
        sch.scheduleJob(job, trigger);
    }
}

QuartzSchduleJob.java用于工作：

public class QuartzSchduleJob implements Job {

    @Override
    public void execute(JobExecutionContext arg0) throws JobExecutionException {        
         System.out.println("calling jobSchedulling::"+System.currentTimeMillis());     
    }    
}

Answer 1

With your current code, your 'scheduler' starts immediatly after sch.start(), so I am guessing you want to know how force your Job to trigger when your 'scheduler' starts.

If so, you can not achieve this with only a cron expression but I have two solutions for you.

1. If you want your Job to be trigger at start and then every ten minutes after, consider using a SimpleScheduleBuilder. In your code, replace the CronExpressionSchedule :

   Trigger trigger = TriggerBuilder.newTrigger()
                         .withIdentity("trigger1", "Group2")
                         .withSchedule(ScheduleBuilder.simpleSchedule()
                             .withIntervalInMinutes(10)
                             .repeatForever())
                         .startNow()
                         .build();
   

2. If you want your Job to trigger at start and then fires on a scheduling based on your Cron expression. Consider using a second trigger :

   [...]
   Trigger trigger2 = TriggerBuilder.newTrigger()
                          .withIdentity("trigger2", "Group2")
                          .withSchedule(ScheduleBuilder.simpleSchedule())
                          .startNow()
                          .build();
   [...]
   sch.start();
   sch.scheduleJob(job, trigger);
   sch.scheduleJob(job, trigger2);