基于Springboot执行多个定时任务并动态获取定时任务信息

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
 */
@service
public 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
 */
@component
public 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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