SpringBoot中使用@Scheduled注解创建定时任务的实现

Timer timer = new Timer();
timer.schedule(new TimerTask() {
 @Override
 public void run() {
  System.out.println("2000毫米后执行一次。");
 }
}, 2000);

timer.schedule(new TimerTask() {
 @Override
 public void run() {
  System.out.println("5000毫米后执行一次。");
 }
}, new Date(System.currentTimeMillis() + 5000));

Timer timer = new Timer();
timer.schedule(new TimerTask() {
 @Override
 public void run() {
  System.out.println(111);
 }
}, 1000, 2000); // 1000毫米后执行第一次，之后每2000毫米执行一次

timer.concel();

<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>

<dependency>
 <groupId>org.slf4j</groupId>
 <artifactId>slf4j-api</artifactId>
 <version>1.7.25</version>
</dependency>

<dependency>
 <groupId>org.slf4j</groupId>
 <artifactId>slf4j-simple</artifactId>
 <version>1.7.6</version>
</dependency>

public class QuartzJob implements Job{

 public void execute(JobExecutionContext context) throws JobExecutionException {
  JobDataMap jobDataMap = context.getJobDetail().getJobDataMap();
  String hello = (String) jobDataMap.get("hello");
  System.err.println(hello);
 }
 
}

public void task() {
 // 该 map 可在 job 中获取
 JobDataMap map = new JobDataMap();
 map.put("hello", "world");

 JobDetail jobDetail = newJob(QuartzJob.class).
   withIdentity("myJob", "myGroup").
   setJobData(map).build();
 /*
  * 简单定时器
  *
  * 执行时间间隔
  * withIntervalInMilliSeconds 毫秒
  * withIntervalInSeconds 秒
  * withIntervalInMinutes 分钟
  * withIntervalInHours 小时
  *
  * 执行次数
  * repeatForever 重复执行
  * withRepeatCount 次数
  */
 SimpleScheduleBuilder scheduleBuilder = simpleSchedule().withIntervalInSeconds(3).withRepeatCount(10);

 /*
  * corn定时器
  *
  * corn表达式，使用更灵活
  * corn表达式在线生成 http://cron.qqe2.com/
  */
 CronScheduleBuilder cronScheduleBuilder = CronScheduleBuilder.cronSchedule("0 0 0 1 * ?");

 Trigger trigger = newTrigger().startAt(new Date()).//startNow() 默认现在开始
   withIdentity("myTrigger", "myGroup").
   //withSchedule(scheduleBuilder).build();
   withSchedule(cronScheduleBuilder).build();

 try {
  //1.创建Scheduler工厂
  SchedulerFactory schedulerFactory = new StdSchedulerFactory();
  //2.获取实例
  Scheduler scheduler = schedulerFactory.getScheduler();
  //3.设置jobDetail详情和trigger触发器
  scheduler.scheduleJob(jobDetail, trigger);
  //4.定时任务开始
  scheduler.start();
 } catch (SchedulerException e) {
  e.printStackTrace();
 }

}

<dependencies>
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-web</artifactId>
 </dependency>
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-test</artifactId>
 <scope>test</scope>
 </dependency>
  <dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-devtools</artifactId>
  <optional>true</optional>
 </dependency>
</dependencies>

@EnableScheduling
@SpringBootApplication
public class SchedulingApplication {

 public static void main(String[] args) {
 SpringApplication.run(SchedulingApplication.class, args);
 }
}

@Component
public class ScheduledTask {

 @Scheduled(initialDelay=1000, fixedDelay = 1000)
 public void task1() {
  System.out.println("延迟1000毫秒后执行，任务执行完1000毫秒之后执行！");
  try {
   Thread.sleep(2000);
  } catch (InterruptedException e) {
   e.printStackTrace();
  }
 }

 @Scheduled(fixedRate = 2000)
 public void task2() {
  System.out.println("延迟1000毫秒后执行，之后每2000毫秒执行一次！");
 }

}

@Scheduled(cron = "*/2 * * * * ?")
public void task3() {
 System.out.println("每2秒执行一次！");
}

Seconds Minutes Hours DayofMonth Month DayofWeek Year
Seconds Minutes Hours DayofMonth Month DayofWeek

*/2 * * * * ? 表示每2秒执行一次！
0 0 2 1 * ? * 表示在每月的1日的凌晨2点调度任务 
0 15 10 ? * MON-FRI 表示周一到周五每天上午10：15执行作业 
0 15 10 ? 6L 2002-2006 表示2002-2006年的每个月的最后一个星期五上午10:15执行作