Quartz（一）Quartz入门

Quartz官网：http://www.quartz-scheduler.org/

创建一个SpringBoot Maven工程

启动示例程序QuartzTest

import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.impl.StdSchedulerFactory;

public class QuartzTest {

    public static void main(String[] args) {

        try {
            Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler();

            scheduler.start();

            scheduler.shutdown();

        } catch (SchedulerException se) {
            se.printStackTrace();
        }
    }
}

注：一旦使用 StdSchedulerFactory.getDefaultScheduler() 获得调度程序，应用程序将不会终止，直到调用 scheduler.shutdown()，因为会有活动线程。

结果如下图

 

 

 在start()和shutdown()调用之间编写代码

  JobDetail job = newJob(HelloJob.class)
      .withIdentity("job1", "group1")
      .build();

  Trigger trigger = newTrigger()
      .withIdentity("trigger1", "group1")
      .startNow()
            .withSchedule(simpleSchedule()
              .withIntervalInSeconds(5)
              .repeatForever())            
      .build();

  scheduler.scheduleJob(job, trigger);

此时注意代码中的静态导入

  import static org.quartz.JobBuilder.*;
  import static org.quartz.TriggerBuilder.*;
  import static org.quartz.SimpleScheduleBuilder.*;

文档中并未给出HelloJob，自己补写

HelloJob

import com.example.quartz.tools.DFUtil;
import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;

import java.util.Date;

public class HelloJob implements Job {
    @Override
    public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException {
        System.out.println("HelloJob.execute"+ DFUtil.format(new Date()) + Thread.currentThread().getName());
    }
}

编写了一个工具类DFUtil

import java.text.SimpleDateFormat;
import java.util.Date;

public class DFUtil {
    public static final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    public static String format(Date date){
        return sdf.format(date);
    }
}

完整的QuartzTest

运行结果

import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.Trigger;
import org.quartz.impl.StdSchedulerFactory;

import java.util.concurrent.TimeUnit;

import static org.quartz.JobBuilder.*;
import static org.quartz.TriggerBuilder.*;
import static org.quartz.SimpleScheduleBuilder.*;

public class QuartzTest {

    public static void main(String[] args) {

        try {
            Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler();

            scheduler.start();

            // define the job and tie it to our HelloJob class
            JobDetail job = newJob(HelloJob.class)
                    .withIdentity("job1", "group1")
                    .build();

            // Trigger the job to run now, and then repeat every 40 seconds
            Trigger trigger = newTrigger()
                    .withIdentity("trigger1", "group1")
                    .startNow()
                    .withSchedule(simpleSchedule()
                            .withIntervalInSeconds(5)
                            .repeatForever())
                    .build();

            // Tell quartz to schedule the job using our trigger
            scheduler.scheduleJob(job, trigger);

            TimeUnit.SECONDS.sleep(20);
            scheduler.shutdown();

        } catch (SchedulerException se) {
            se.printStackTrace();
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }
    }
}