定时器篇：定时任务入门小案例

package utils;

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

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

/** 工作类 具体需要特定时间执行的某个任务  备份数据库 定时还款
 * zt
 * 2020/10/15
 * 11:18
 */
public class MyJob implements Job {
    @Override
    public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException {
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");

        System.out.println("双11活动开始啦，快来抢购啊 "+simpleDateFormat.format(new Date()));
    }
}

package utils;

import org.quartz.*;
import org.quartz.impl.StdSchedulerFactory;

import java.util.Date;

/**
 * zt
 * 2020/10/15
 * 11:20
 */
public class QuartzDemo1 {
    public static void main(String[] args) throws Exception{
        //1.调度器 scheduler
        Scheduler scheduler = new StdSchedulerFactory().getScheduler();
        //2.触发器 触发任务执行
        Trigger trigger = TriggerBuilder
                .newTrigger().withIdentity("myGroup1","myTrigger1")
                .withSchedule(SimpleScheduleBuilder.simpleSchedule().withIntervalInSeconds(5)
                .repeatForever())
                .startNow()
                .build();
        //3.工作对象  jobDetail
        JobDetail jobDetail = JobBuilder.newJob(MyJob.class)
                .withIdentity("myJob", "myGroup").build();
        //4.注册任务和触发器
        Date date = scheduler.scheduleJob(jobDetail, trigger);
        //5.开启任务
        scheduler.start();
    }
}