Spring Boot Boot Timer task

1.

Integration of timed tasks in spring boot

In the Startup class, add an annotation that opens a timed task:

The use of timed tasks in Springboot is fairly straightforward. First, we add @enablescheduling to the startup class to open the timed task.

@EnableScheduling  Public class startapplication {        publicstaticvoid  main (string[] args) {                Springapplication.run (startapplication. class , args);}    }

2. Then we directly create the service that performs the scheduled task, for example:

@Service  Public class testservice {        // per minute start    @Scheduled (cron= "0 0/1 * * *?") Publicvoid  Test () {        System.out.println ("I am Testing Schedule" )     );    }}

Operation Result:

As you can see, the method has been executed once every minute.

Next:

Let's talk about cron expressions: You can refer to this article: https://www.cnblogs.com/javahr/p/8318728.html

In addition to the way above, you can also specify fixedrate,fixeddelay,initialdelay and other ways to set the timing mode, such as:

 PackageCom.zlc.service;Importjava.util.Date;Importorg.springframework.scheduling.annotation.Scheduled;ImportOrg.springframework.stereotype.Service; @Service Public classTestservice {//start once per minute@Scheduled (cron= "0/5 * * * * *?"))     Public voidTest () {System.out.println ("I AM Testing Schedule"); }      //executes every 5 seconds after the last boot time point@Scheduled (Fixedrate= 5000)     Public voidtest1 () {System.out.println ("QD:" +NewDate ()); }        //executes every 5 seconds after the last end time point@Scheduled (Fixeddelay = 5000)     Public voidtest2 () {System.out.println ("JS:" +NewDate ()); }        //first delay x second execution, followed by fixedrate rules every x seconds@Scheduled (InitialDelay = 5000,fixedrate = 6000)     Public voidtest3 () {System.out.println ("Sdsds"); }    }

Spring Boot Boot Timer task