Java simple timing tasks

@Scheduled

  There are many ways to write timed tasks. I think the easiest way is to use annotations. If your project uses the spring boot framework, you can complete it in three steps:

One, add the @EnableScheduling annotation to the entry class declaration

 

1. /**

2. * 启动

3. *

4. */

5. @SpringBootApplication

6. @EnableScheduling

7. public class Application {

8. public static void main(String args[]) {

9. SpringApplication.run(Application.class, args);

10. }

11. }

Second, create a class, add @Component annotation

1. @Component

2. public class Task {

3.  

4. }

Three, create method, add @Scheduled annotation

1. @Scheduled(cron = "${task.cron.tradeData}")

2. public void getTradeData() {

3.  

4. }

(Here cron is taken from the configuration file, as follows)

task:
   cron:
     tradeData: 0 1 0 * * ?

It seems simple, but there are many pits hidden, and you fall into it accidentally, such as:

(1) This method cannot have parameters

(2) This method cannot have a return value

(3) This category cannot include other methods with any annotations (Discover New World)

Violation of any one, the timing will not take effect!