[Java] spring boot task实现动态创建定时任务的方法

• 不支持分布式部署
  
• 不支持动态配置定时任务
  
• 不支持持久化
  

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 * * * * *")
 );
 
 @override
 public 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
 @allargsconstructor
 static class task {
 /**
  * 主键id
  */
 private int id;
 /**
  * 任务名称
  */
 private string name;
 /**
  * cron表达式
  */
 private string cron;
 }
}