java quartz调度程序在特定时间运行

Question

例如，我想编写一个Java程序，在每天上午12点打印“Hello World”，如何使用Quartz调度器实现这一点？

Trigger trigger = TriggerUtils.makeDailyTrigger(0, 0);
trigger.setName("trigger1");
trigger.setGroup("group1");

这样地？我应该把打印“hello world”方法放在哪里？

Answer 1

您必须通过实现作业接口并提供执行方法的实现来创建自定义作业。在execute方法中，您可以打印“hello world”。然后你可以这样安排你的工作

scheduler.scheduleJob(job, trigger);

有关分步详细信息，请参阅此链接：Quartz教程

Answer 2

>

下载放入lib文件夹的quartz Jar构建项目

创建要从中计划任务的类（作业）

import org.apache.log4j.Logger;
import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;

public class MyJob implements Job  {
    private Logger log = Logger.getLogger(MyJob.class);
    @Override
    public void execute(JobExecutionContext context) throws JobExecutionException {

        log.debug("Hi....");
        System.out.println("Corn Executing.....");

    }
}

为计划任务创建类

import org.quartz.JobBuilder;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.SchedulerFactory;
import org.quartz.SimpleScheduleBuilder;
import org.quartz.Trigger;
import org.quartz.TriggerBuilder;
import org.quartz.impl.StdSchedulerFactory;

public class JobScheduler {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        try {
            JobDetail job = JobBuilder.newJob(MyJob.class).withIdentity("myjob").build();

            Trigger trigger = TriggerBuilder.newTrigger().withSchedule(SimpleScheduleBuilder.simpleSchedule().withIntervalInSeconds(30).repeatForever()).build();

            SchedulerFactory schFactory = new StdSchedulerFactory();
            Scheduler scheduler = schFactory.getScheduler(); 
            scheduler.start();
            scheduler.scheduleJob(job, trigger);

        }catch (SchedulerException e) {

            e.printStackTrace();
        }
    }
}

Answer 3

可以使用表达式来计划作业的执行。例如。：

public static class HelloJob implements Job {
    @Override
    public void execute(JobExecutionContext ctx) throws JobExecutionException {
        System.out.println("Hello World");
    }
}

public static void main(String[] args) throws SchedulerException {
    String exp = "0 0 0 1/1 * ? *";

    SchedulerFactory factory = new StdSchedulerFactory();
    Scheduler scheduler = factory.getScheduler();
    scheduler.start();
    JobDetail job = JobBuilder.newJob(HelloJob.class).build();
    Trigger trigger = TriggerBuilder.newTrigger()
                                    .startNow()
                                    .withSchedule(
                                         CronScheduleBuilder.cronSchedule(exp))
                                    .build();
    scheduler.scheduleJob(job, trigger);
}

请参见构建另一个表达式的http://www.cronmaker.com/。*每分钟查看输出。另请参见Cron表达式。