[quartz] Scheduler启动一段时间后添加新任务，新任务会被立即执行多次

gdrocky1989 2015-12-28 02:30:50

一个Scheduler，调用start()后一段时间，再添加新任务A，新任务A在添加时就会被执行多次，用来弥补该Scheduler开始后到新任务A添加这段时间内本应该执行的那些任务，但是我并不想让这段时间的任务被执行，怎么破？？
贴一下代码

SchedulerFactory sf = new StdSchedulerFactory();

    Scheduler sched = sf.getScheduler();

    JobDetail job = newJob(InvokeStatJob.class)             //print "hello -- "+ new Date()

            .withIdentity("job1", "group1")

            .build();

    CronTrigger trigger = newTrigger()

            .withIdentity("trigger1", "group1")

            .withSchedule(cronSchedule("0/2 * * * * ?"))

            .build();

    JobDetail job2 = newJob(InvokeStatJob2.class)           //print "world! --- "+new Date()

            .withIdentity("job2", "group2")

            .build();

    CronTrigger trigger2 = newTrigger()

            .withIdentity("trigger2", "group2")

            .withSchedule(cronSchedule("0/3 * * * * ?"))

            .build();

    sched.scheduleJob(job, trigger);

    sched.start();

    Thread.sleep(10L * 1000L);

    System.out.println("=========================");

    sched.scheduleJob(job2,trigger2);

    Thread.sleep(30L*1000L);

    sched.shutdown(true);

执行结果：
hello -- Mon Dec 28 10:33:18 CST 2015
hello -- Mon Dec 28 10:33:20 CST 2015
hello -- Mon Dec 28 10:33:22 CST 2015
hello -- Mon Dec 28 10:33:24 CST 2015
hello -- Mon Dec 28 10:33:26 CST 2015
hello -- Mon Dec 28 10:33:28 CST 2015
=========================
world! --- Mon Dec 28 10:33:28 CST 2015
world! --- Mon Dec 28 10:33:28 CST 2015
world! --- Mon Dec 28 10:33:28 CST 2015
world! --- Mon Dec 28 10:33:28 CST 2015
hello -- Mon Dec 28 10:33:30 CST 2015
world! --- Mon Dec 28 10:33:30 CST 2015
hello -- Mon Dec 28 10:33:32 CST 2015
world! --- Mon Dec 28 10:33:33 CST 2015
hello -- Mon Dec 28 10:33:34 CST 2015
hello -- Mon Dec 28 10:33:36 CST 2015
world! --- Mon Dec 28 10:33:36 CST 2015

在"========================="后面的前四个“world! --- Mon Dec 28 10:33:28 CST 2015”是为了弥补前10秒错过的，但是我并不想要，应该怎么做？

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gdrocky1989 2015-12-28

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问题找到了，triger在定义时有一个默认的参数startTime，如果不设置的话会默认设置为now 所以，上面的代码应该改为：

SchedulerFactory sf = new StdSchedulerFactory();
        Scheduler sched = sf.getScheduler();
        JobDetail job = newJob(InvokeStatJob.class)             //print "hello -- "+ new Date()
                .withIdentity("job1", "group1")
                .build();
        CronTrigger trigger = newTrigger()
                .withIdentity("trigger1", "group1")
                .startNow()
                .withSchedule(cronSchedule("0/2 * * * * ?"))
                .build();
        sched.scheduleJob(job, trigger);
        sched.start();
        Thread.sleep(10L * 1000L);
        System.out.println("=========================");
        JobDetail job2 = newJob(InvokeStatJob2.class)           //print "world! --- "+new Date()
                .withIdentity("job2", "group2")
                .build();
        CronTrigger trigger2 = newTrigger()
                .withIdentity("trigger2", "group2")
                .startNow()
                .withSchedule(cronSchedule("0/3 * * * * ?"))
                .build();
        sched.scheduleJob(job2, trigger2);
        Thread.sleep(30L*1000L);
        sched.shutdown(true);