在Spring Boot項(xiàng)目中，通過@EnableScheduling可啟用Spring自帶的定時(shí)任務(wù)支持，在通過@Scheduled注解定義定時(shí)任務(wù)，但是通過注解只能編寫固定時(shí)間的定時(shí)任務(wù)，無(wú)法動(dòng)態(tài)調(diào)整定時(shí)間隔，可通過實(shí)現(xiàn)SchedulingConfigurer接口實(shí)現(xiàn)動(dòng)態(tài)定時(shí)任務(wù)注冊(cè)。

參考代碼：

package org.cent.demo.scanner.schedule;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.Trigger;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.SchedulingConfigurer;
import org.springframework.scheduling.config.ScheduledTaskRegistrar;
import org.springframework.scheduling.support.CronTrigger;

import java.util.Arrays;
import java.util.List;

/**
 * @author: cent
 * @email: 292462859@qq.com
 * @date: 2019/1/16.
 * @description:
 */
@Configuration
@EnableScheduling
@Slf4j
public class DynamicSchedule implements SchedulingConfigurer {

    /**
     * 測(cè)試數(shù)據(jù)，實(shí)際可從數(shù)據(jù)庫(kù)獲取
     */
    private List<Task> tasks = Arrays.asList(
            new Task(1, "任務(wù)1", "*/30 * * * * *"),
            new Task(2, "任務(wù)2", "*/30 * * * * *"),
            new Task(3, "任務(wù)3", "*/30 * * * * *"),
            new Task(4, "任務(wù)4", "*/30 * * * * *"),
            new Task(5, "任務(wù)5", "*/30 * * * * *"),
            new Task(6, "任務(wù)6", "*/30 * * * * *"),
            new Task(7, "任務(wù)7", "*/30 * * * * *"),
            new Task(8, "任務(wù)8", "*/30 * * * * *"),
            new Task(9, "任務(wù)9", "*/30 * * * * *"),
            new Task(10, "任務(wù)10", "*/30 * * * * *")
    );

    @Override
    public void configureTasks(ScheduledTaskRegistrar scheduledTaskRegistrar) {
        tasks.forEach(task -> {
            //任務(wù)執(zhí)行線程
            Runnable runnable = () -> log.info("execute task {}", task.getId());

            //任務(wù)觸發(fā)器
            Trigger trigger = triggerContext -> {
                //獲取定時(shí)觸發(fā)器，這里可以每次從數(shù)據(jù)庫(kù)獲取最新記錄，更新觸發(fā)器，實(shí)現(xiàn)定時(shí)間隔的動(dòng)態(tài)調(diào)整
                CronTrigger cronTrigger = new CronTrigger(task.getCron());
                return cronTrigger.nextExecutionTime(triggerContext);
            };

            //注冊(cè)任務(wù)
            scheduledTaskRegistrar.addTriggerTask(runnable, trigger);
        });

    }

    @Data
    @AllArgsConstructor
    static class Task {
        /**
         * 主鍵ID
         */
        private int id;
        /**
         * 任務(wù)名稱
         */
        private String name;
        /**
         * cron表達(dá)式
         */
        private String cron;
    }
}