Enterprise Distribution Micro Service Cloud Springcloud springboot MyBatis (32) Spring boot do the dispatch task

Building projects

Create a Springboot project, add @enablescheduling to its program entry, and start the dispatch task.

@SpringBootApplication @enableschedulingpublic class Springbootschedulingtasksapplication {public    static void Main (string[] args) {        springapplication.run (springbootschedulingtasksapplication.class, args);}    }

　　

Create a timed task

Create a timed task that prints the current time in the console every 5s.

@Componentpublic class Scheduledtasks {    private static final Logger log = Loggerfactory.getlogger ( Scheduledtasks.class);    private static final SimpleDateFormat DateFormat = new SimpleDateFormat ("HH:mm:ss");    @Scheduled (fixedrate =) public    void Reportcurrenttime () {        log.info ("The time was now {}", Dateformat.format ( New Date ()));}    }

　　

By adding @scheduled annotations to the method, it shows that the method is a dispatch task.

• @Scheduled (fixedrate = 5000): Executes 5 seconds after the last start point of execution
• @Scheduled (Fixeddelay = 5000): Executed 5 seconds after the last execution time
• @Scheduled (initialdelay=1000, fixedrate=5000): Executes after the first delay of 1 seconds, followed by fixedrate rules every 5 seconds
• @Scheduled (cron= "/5"): Define rules by cron expressions, what are CRO expressions, self-search engines.

Test

Start the Springboot project, the console has not been 5s to print out the current time.

2017-04-29 17:39:37.672 INFO 677-[pool-1-thread-1] com.forezp.task.ScheduledTasks:The time is now 17:39:37
2017-04-29 17:39:42.671 INFO 677-[pool-1-thread-1] com.forezp.task.ScheduledTasks:The time is now 17:39:42
2017-04-29 17:39:47.672 INFO 677-[pool-1-thread-1] com.forezp.task.ScheduledTasks:The time is now 17:39:47
2017-04-29 17:39:52.675 INFO 677-[pool-1-thread-1] com.forezp.task.ScheduledTasks:The time is now 17:39:52

Summarize

Creating a timed task in Springboot is simple and takes only 2 steps:

• 1. Add @enablescheduling annotations at the entrance of the program.
• 2. Add @scheduled annotations to the timing method.

Source Source

Enterprise Distribution Micro Service Cloud Springcloud springboot MyBatis (32) Spring boot do the dispatch task