Spring frameworks come from 3.0, with task scheduling feature, it is a lightweight quartz, and it is convenient, simple, and does not need to rely on other JAR packets.
It is more convenient to use in SpringBoot, just need to add @Configuration and @Enables in the class head.
Then use @scheduled (cron = "cron =" 0 0/5 * * * *? ") To be implemented in a simple scheduling task.

@Component
@Configuration      // 1. Mainly used to mark the configuration class, both the effect of Component.
@EnableScheduling // 2. Open timemian
public class XXXJob {

    // log
    private Logger logger = LoggerFactory.getLogger(XXXJob.class);


    @Scheduled(cron = "0 0/5 * * * ?")
    public void excuteTask() {
        logger.info("XXX Task, start!");

        // DO execution business logic

        logger.info("XXX Task, end!");
    }

Based on fixed CRON expressions based on fixed CRON expressions, is there a simple implementation of dynamic configuration?
We can achieve a simple dynamic configuration method based on NACOS

First of all our dispatch tasks to implement the SchedulingConfigura interface

@Component
@Configuration
@EnableScheduling
// Class To implement the SchedulingConfigura interface
public class XXXTask implements SchedulingConfigurer {

    / / Method for implementing an interface
    @Override
    public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {

        // Perform a task Using Addtriggertask
        taskRegistrar.addTriggerTask(
        // The first method implements its own scheduling task business logic
        () -> executeYearBill(), //Business logic
        / / Implement the trigger logic
        triggerContext -> {
            / / Take dynamic cron expression from NACOS
            String cron = nacosUtil.getXXXCron();/ / Get the configuration yourself to implement the NACOS method
            / / Judge whether NACOS has a configured cron expression, if not given a default configuration
            if(StringUtils.isEmpty(cron)){
                cron = "0/2 * * * * ?"; / / The default configuration is executed every 2 seconds
            }
            logger.info("Current trigger ..."+cron);
            // This is obtained after the dynamic configuration is executed, perform the calculation of the next promotion time.
            CronTrigger trigger = new CronTrigger(cron);
            Date nextExec = trigger.nextExecutionTime(triggerContext);
            return nextExec;
        });

    }
}

This method can simply dynamically implement NACOS configuration modifications and real-time cron expressions perform scheduling tasks.
However, there is still a small pit, which is that once the scheduled task is stopped, even if the dynamic changes are not used, because the task is not executed. If you want to dynamically start, you need to achieve a distributed scheduling platform such as XXL-JOB.