Scheduling Task

Scheduling Task include two steps. The First one is to add @EnableScheduling in the application, the second is the put @Scheduled on the top of the task/method.

@SpringBootApplication
@EnableScheduling
public class Application {
   public static void main(String[] args) throws Exception {
       SpringApplication.run(Application.class);
   }
}

Put @Scheduled(cron = “* * * * * *”) on the top of the task/method. The method must return void. The *s are representing Second, Minute, Hour, Day of Month, Month of Year, Day of Week, similar to cron job in Linux/Unix environment. eg: Run a task every second:

   @Scheduled(cron = "*/1 * * * * *")
   void serviceMethod() {
       System.out.println("serviceMethod has been run");
   }

eg: Run a task every day on 23:59

   @Scheduled(cron = "* 59 23 * * *")
   void serviceMethod() {
       System.out.println("serviceMethod has been run");
   }

There are other scheduled type can be used, such as fixedRate. eg: Execute the annotated method with a fixed period between invocations. Run a task every second.

  @Scheduled(fixedRate=1000L)
   void serviceMethod() {
       System.out.println("serviceMethod has been run");
   }