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有没有办法将 crontrigger 设置为在特定日期之后开始。即 crontrigger 将使用其 cron 表达式在特定日期之后触发。我尝试使用 crontrigger 开始时间和首次触发时间但没有工作。我可以使用另一个触发器来做到这一点,但我认为应该有另一种方式。

这是 cron 表达式

0  0/5  *  * * ? 

即在分钟 (5,10,15,...00) 不是现在+5

这是日志程序写入

触发器应在 2011 年 5 月 27 日星期五 21:03:31 EEST 开始 // 我希望它在这个时间运行

Job start at  Fri May 27 20:55:00 EEST 2011          //it ignore start time 
Job start at  Fri May 27 21:00:00 EEST 2011
Job start at  Fri May 27 21:05:00 EEST 2011

 public CronTrigger scheduleJob(RemoteJob job, String cronExpression,Date firstFireTime) throws SchedulerException, ParseException {
    JobDetail jobDetail = new JobDetail(job.getDescription(), job.getName(), job.getClass());
    CronTrigger crTrigger = new CronTrigger(
            "cronTrigger", job.getName(), cronExpression);       
    scheduler.scheduleJob(jobDetail, crTrigger);    

    try{
        Calendar  c=Calendar.getInstance();
        c.add(Calendar.MINUTE, 10);
        firstFireTime=c.getTime();
        FileWriter writer=new FileWriter("/opt/scheduler.cron",true);
        writer.write("Trigger should start at " +c.getTime().toString()+"\n\n");
        writer.close();
    }catch(Exception e){

    }
     crTrigger.setStartTime(firstFireTime);
    crTrigger.setMisfireInstruction(CronTrigger.MISFIRE_INSTRUCTION_DO_NOTHING);

    return crTrigger;

}

这是由触发器执行的作业。

public class ExternalJob extends RemoteJob {

    private static final Logger _logger = Logger.getLogger(ExternalJob.class.getName());
    private static ExternalStorageProcessor processor = new ExternalStorageProcessor();
    private ExternalTask task;
    private static final String tempPath = "/opt/itaptemp/";
    private String name;
    private String description;
    private static final long MARK=1L;

    public ExternalJob(String name, String description) {



    public void execute(JobExecutionContext context) throws JobExecutionException {


         try{
            Calendar  c=Calendar.getInstance();          

            FileWriter writer=new FileWriter("/opt/scheduler.cron",true);
            writer.write("Job start at  " +c.getTime().toString()+"\n");
            writer.close();
        }catch(Exception e){

        }
4

2 回答 2

2

问题是您使用的是一个 cron,它每偶数分钟触发一次,从 0 分钟开始(0 0/5 * * * ? )。

您应该将开始日期设置为偶数分钟。因此你可以使用DateBuilder.EvenMinuteDateBefore(StartTime).

因此,如果您的 starttime 是... Fri May 27 20:55:31...该方法DateBuilder.EvenMinuteDateBefore(StartTime)会将其转换为 ... Fri May 27 20:55:00

然后您的日程安排将如下所示:

Job start at  Fri May 27 20:55:00 EEST 2011
Job start at  Fri May 27 21:00:00 EEST 2011
Job start at  Fri May 27 21:05:00 EEST 2011
于 2012-10-17T06:27:01.690 回答
1

将 startTime 属性设置为您希望计划(表达式)开始应用的未来日期。

我看到你说你试过了,但它没有用,但它肯定应该,所以请再试一次。

    CronTrigger ct = new CronTrigger("foo", "goo", "0 0/10 * * * ?"); // fire every ten minutes, all day every day

    // construct a date of March 17, 2012 10:03:00
    Calendar futureDate = Calendar.getInstance(); 
    futureDate.set(Calendar.YEAR, 2012);
    futureDate.set(Calendar.MONTH, GregorianCalendar.MARCH);
    futureDate.set(Calendar.DAY_OF_MONTH, 17);
    futureDate.set(Calendar.HOUR_OF_DAY, 10);
    futureDate.set(Calendar.MINUTE, 3);
    futureDate.set(Calendar.SECOND, 0);
    futureDate.set(Calendar.MILLISECOND, 0);

    // use the date as the startTime
    ct.setStartTime(futureDate.getTime());

    // check what time the trigger will first fire
    List fireTimes = TriggerUtils.computeFireTimes(ct, null, 1);
    Date firstFireTime = (Date) fireTimes.iterator().next();

    System.out.println("First fire time: " + firstFireTime);

这导致:

第一次开火时间:2012 年 3 月 17 日星期六 10:10:00 MDT

于 2011-05-26T19:49:17.490 回答