Quartz入门Demo

一 quartz是什么

Quartz 是一个完全由 Java 编写的开源作业调度框架，为在 Java 应用程序中进行作业调度提供了简单却强大的机制。

二 quartz核心概念

三 代码演示

目的：设置一个定时器，每两秒钟输出一次“Hello Quartz”

   org.quartz-scheduler
   quartz
   2.3.0

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

 import static org.quartz.JobBuilder.newJob;
 import static org.quartz.SimpleScheduleBuilder.simpleSchedule;
 import static org.quartz.TriggerBuilder.newTrigger;

public class Demo {

        public static void main(String[] args) {

            try {
                // Grab the Scheduler instance from the Factory
                Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler();

                // and start it off
                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(2)
                                .repeatForever())
                        .build();

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

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

import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;

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

public class HelloJob implements Job {
    @Override
    public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException {
        //打印当前的执行时间 例如 2017-11-23 00:00:00
        Date date = new Date();
        SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        System.out.println("现在的时间是："+ sf.format(date));
        //具体的业务逻辑
        System.out.println("Hello Quartz");
    }
}

运行结果如下