java定时任务实现的4种方式

文章目录

1. java自带的Timer2.ScheduledThreadPool-线程池3.使用注解的形式：@Scheduled4.使用Quartz定时任务调度器

1. java自带的Timer

Timer timer = new Timer(); timer.schedule(new TimerTask() { @Override public void run() { System.out.println("Time's up!"); } },3*1000,1000);

2.ScheduledThreadPool-线程池

ScheduledExecutorService scheduledThreadPool = Executors.newScheduledThreadPool(2); scheduledThreadPool.scheduleAtFixedRate(new Runnable() { @Override public void run() { System.out.println("========================="); } }, 1000, 2000, TimeUnit.MILLISECONDS); scheduledThreadPool.scheduleAtFixedRate(new Runnable() { @Override public void run() { System.out.println(System.currentTimeMillis()+"<><>"+System.nanoTime()); } }, 1000, 2000, TimeUnit.MILLISECONDS);

3.使用注解的形式：@Scheduled

@Component public class SpringScheduled { @Scheduled(initialDelay = 2000,fixedDelay = 5000) public void doSomething() { System.out.println("Spring自带的Scheduled执行了======================="); } }

//下面是开启

@SpringBootApplication @EnableScheduling public class DemoApplication { public static void main(String[] args) throws InterruptedException { SpringApplication application = new SpringApplication(DemoApplication.class); application.addListeners(new ContextRefreshedEventListener()); application.run(args); } }

4.使用Quartz定时任务调度器

配置 @Configuration public class QuartzConfig { @Resource private ScheduleTask scheduleTask; /** * 配置定时任务1 * @return */ @Bean(name="firstJobDetail") public MethodInvokingJobDetailFactoryBean firstJobDetail(){ MethodInvokingJobDetailFactoryBean method = new MethodInvokingJobDetailFactoryBean(); // 为需要执行的实体类对应的对象 method.setTargetObject(scheduleTask); // 需要执行的方法 method.setTargetMethod("test"); // 是否并发执行 method.setConcurrent(false); return method; } /** * 配置触发器1 * @param firstJobDetail * @return */ @Bean(name="firstTrigger") public SimpleTriggerFactoryBean firstTrigger(JobDetail firstJobDetail){ SimpleTriggerFactoryBean simpleBean = new SimpleTriggerFactoryBean(); simpleBean.setJobDetail(firstJobDetail); // 设置任务启动延迟 simpleBean.setStartDelay(1000); // 每1秒执行一次 simpleBean.setRepeatInterval(1000); //设置重复计数 //simpleBean.setRepeatCount(0); return simpleBean; } /** * 配置Scheduler */ @Bean(name = "scheduler") public SchedulerFactoryBean schedulerFactoryBean(Trigger firstTrigger){ SchedulerFactoryBean factoryBean = new SchedulerFactoryBean(); factoryBean.setTriggers(firstTrigger); return factoryBean; } }

要执行的任务

@Component public class ScheduleTask { public void test() { System.out.println("===================================="); } }

转载说明： 作者：璀璨英雄 原文链接：https://blog.csdn.net/l848168/article/details/84971331