在Spring Boot项目中，通过@EnableScheduling可启用Spring自带的定时任务支持，在通过@Scheduled注解定义定时任务，但是通过注解只能编写固定时间的定时任务，无法动态调整定时间隔，可通过实现SchedulingConfigurer接口实现动态定时任务注册。

参考代码：

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 {/*** 测试数据，实际可从数据库获取*/private List<Task> tasks = Arrays.asList(new Task(1, "任务1", "*/30 * * * * *"),new Task(2, "任务2", "*/30 * * * * *"),new Task(3, "任务3", "*/30 * * * * *"),new Task(4, "任务4", "*/30 * * * * *"),new Task(5, "任务5", "*/30 * * * * *"),new Task(6, "任务6", "*/30 * * * * *"),new Task(7, "任务7", "*/30 * * * * *"),new Task(8, "任务8", "*/30 * * * * *"),new Task(9, "任务9", "*/30 * * * * *"),new Task(10, "任务10", "*/30 * * * * *"));@Overridepublic void configureTasks(ScheduledTaskRegistrar scheduledTaskRegistrar) {tasks.forEach(task -> {//任务执行线程Runnable runnable = () -> log.info("execute task {}", task.getId());//任务触发器Trigger trigger = triggerContext -> {//获取定时触发器，这里可以每次从数据库获取最新记录，更新触发器，实现定时间隔的动态调整CronTrigger cronTrigger = new CronTrigger(task.getCron());return cronTrigger.nextExecutionTime(triggerContext);};//注册任务scheduledTaskRegistrar.addTriggerTask(runnable, trigger);});}@Data@AllArgsConstructorstatic class Task {/*** 主键ID*/private int id;/*** 任务名称*/private String name;/*** cron表达式*/private String cron;}
}