Quartz

    <!-- quartz begin -->
      <dependency>
       <groupId>org.quartz-scheduler</groupId>
       <artifactId>quartz</artifactId>
       <version>2.2.1</version>
     </dependency>
     <dependency>
       <groupId>org.quartz-scheduler</groupId>
       <artifactId>quartz-jobs</artifactId>
       <version>2.2.1</version>
     </dependency> 
     <!-- quartz end -->
     
     <!-- log -->
     <dependency>  
        <groupId>org.slf4j</groupId>  
        <artifactId>slf4j-simple</artifactId>  
        <version>1.7.25</version>  
    </dependency>

package com.quartz.first;

import java.util.Date;

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

/**
 * 
 * 使用 RAM 方式定时
 * 
 * @author 丰志
 *
 */
public class RAMQuartz {

    public static void main(String[] args) throws SchedulerException {
        //1.创建Scheduler的工厂
        SchedulerFactory schedulerFactory = new StdSchedulerFactory();
        //2.从工厂中获取调度器实例
        Scheduler scheduler = schedulerFactory.getScheduler();
        //3.创建JobDetail
        JobDetail jobDetail = JobBuilder.newJob(MyJob.class)
                .withDescription("this is a ram job") //job的描述
                .withIdentity("ramJob", "ramGroup") //job 的name和group
                .build();

//        jobDetail.getJobDataMap().put("name", "zhangsan"); //传参用与MyJob中获取参数    jobDataMap.get("name")
        
        //任务运行的时间，SimpleSchedle类型触发器有效
        long time=  System.currentTimeMillis() + 3*1000L; //3秒后启动任务
        Date statTime = new Date(time);

        //4.创建Trigger
        //使用SimpleScheduleBuilder或者CronScheduleBuilder
        Trigger trigger = TriggerBuilder.newTrigger()
                    .withDescription("")
                    .withIdentity("ramTrigger", "ramTriggerGroup")
                    .startAt(statTime)  //默认当前时间启动
//                    .withSchedule(SimpleScheduleBuilder.simpleSchedule().withIntervalInSeconds(2).withRepeatCount(10)) // 每个2秒钟执行一次，一共执行10次
//                    .withSchedule(CronScheduleBuilder.cronSchedule("0/2 * * * * ?")) //两秒执行一次,cron 秒、分、时、日、月、年、
                    .build();

        //5.注册任务和定时器
        scheduler.scheduleJob(jobDetail, trigger);
        //6.启动 调度器
        scheduler.start();
    }
}