springboot、定时器

1.启动类上添加注解  

 @EnableScheduling   //启用定时器功能 

@SpringBootApplication()
@ComponentScan(basePackages={"com"})
@ServletComponentScan  //scans from the package of the annotated class (@WebServlet, @WebFilter, and @WebListener) 
@EnableScheduling   //启用定时器功能
public class DemoApplication {

    public static void main(String[] args) {
        
        //此设置一定要在SpringApplication.run(DemoApplication.class, args); 前面进行设置
        //System.setProperty("spring.devtools.restart.enabled","false");
        SpringApplication.run(DemoApplication.class, args);
    }

}

2.定时器任务类

@Component
public class MyScheduler {

     private static final SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");

        //每隔2秒执行一次
        @Scheduled(fixedRate = 2000)
        public void testTasks1() {
            System.out.println("定时任务执行时间：" + dateFormat.format(new Date()));
        }

        //每天3：05执行
        @Scheduled(cron = "0 05 03 ? * *")
        public void testTasks() {
            System.out.println("定时任务执行时间：" + dateFormat.format(new Date()));
        }

}