简介

因为一些业务的需要所有需要使用多个不同的定时任务，并且每个定时任务中的定时信息是通过数据库动态获取的。下面是我写的使用了Springboot+Mybatis写的多任务定时器。

主要实现了以下功能：

1、同时使用多个定时任务
2、动态获取定时任务的定时信息

说明

因为我们需要从数据库动态的获取定时任务的信息，所以我们需要集成 SchedulingConfigurer 然后重写 configureTasks 方法即可，调用不同的定时任务只需要通过service方法调用不用的实现返回对应的定时任务信息。有多少个定时任务就重写多少个该方法（最好创建不同的类）。然后直接在application中启动即可。

SpringApplication-启动类

package test;import org.mybatis.spring.annotation.MapperScan;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.context.annotation.ComponentScan;import org.springframework.scheduling.annotation.EnableScheduling;import org.springframework.transaction.annotation.EnableTransactionManagement;@SpringBootApplication@EnableTransactionManagement@EnableScheduling@ComponentScan(value = {"test.*"})@MapperScan("test.mapper.*")public class TomcatlogApplication { public static void main(String[] args) { SpringApplication.run(TomcatlogApplication.class, args); }}

动态获取定时任务信息

mapper

import org.apache.ibatis.annotations.Param;import org.apache.ibatis.annotations.Select;import java.util.List;/* * @version 1.0 created by liuxuewen on 2018/8/21 14:39 */public interface TomcatlogMapper { @Select("SELECT * FROM scheduledtask s WHERE s.`enable` = 1") String queryScheduledTask();}

service

package test.service;import java.util.ArrayList;import java.util.List;/* * @version 1.0 created by liuxuewen on 2018/8/21 14:44 */public interface TomcatlogService { List<ScheduledtaskEntity> queryScheduledTask();}

service impl

import test.mapper.tomcatlog.TomcatlogMapper;import test.service.TomcatlogService;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import java.util.List;/* * @version 1.0 created by liuxuewen on 2018/8/21 14:44 */@Servicepublic class TomcatlogServiceImpl implements TomcatlogService { private static final Logger LOGGER = LoggerFactory.getLogger(TomcatlogServiceImpl.class); @Autowired TomcatlogMapper tomcatlogMapper; @Override public String queryScheduledTask() { try { String res = tomcatlogMapper.queryScheduledTask(); return res; } catch (Exception e) { LOGGER.info(e); } return null;}

定时任务

package test.schedultask;import test.controller.MainController;import test.service.ControllerService;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.scheduling.annotation.SchedulingConfigurer;import org.springframework.scheduling.config.ScheduledTaskRegistrar;import org.springframework.scheduling.support.CronTrigger;import org.springframework.stereotype.Component;import org.springframework.util.StringUtils;/* * @version 1.0 created by liuxuewen on 2018/8/27 9:25 */@Componentpublic class ElasticsearchSchedultaskController implements SchedulingConfigurer { private static final Logger LOGGER = LoggerFactory.getLogger(ElasticsearchSchedultaskController.class); @Autowired private ControllerService controllerService; @Autowired private MainController mainController; @Override public void configureTasks(ScheduledTaskRegistrar scheduledTaskRegistrar) { try { scheduledTaskRegistrar.addTriggerTask( //1.添加任务内容(Runnable)，可以为方法 () -> Sytem.out.println("定时任务1"), //2.设置执行周期(Trigger) triggerContext -> { //2.1 从数据库获取执行周期，在这里调用不同的方法返回不同的定时任务信息 String cron = controllerService.getSchedultaskForElasticsearch(); System.out.println("controllerService.getSchedultaskForElasticsearch()"); System.out.println(cron); //2.2 合法性校验. if (StringUtils.isEmpty(cron)) { // Omitted Code .. LOGGER.error("计划任务为空"); } //2.3 返回执行周期(Date) return new CronTrigger(cron).nextExecutionTime(triggerContext); } ); }catch (Exception e){ String ex = exceptionLoggingUtil.exceptionPrint(e); LOGGER.info(ex); } }}

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