利用quartz实现定时任务的定时时间动态化

本文是借鉴springboot整合Quartz实现动态配置定时任务_牛奋lch-CSDN博客_springboot定时任务动态配置

编写。

业务需求场景：定时任务执行时间经常需要变动

实现逻辑：

1、创建一个定时任务（ScheduledTask）

package com.gaozhen.webservicedemo.service;

import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.stereotype.Component;


@Configuration
@Component
@EnableScheduling
public class ScheduledTask {

    public void sayHello(){
        System.out.println("执行此定时任务方法");
    }
}

2、创建QuartzConfig配置类，初始化定时任务执行方式

jobDetail初始化定时任务

jobTrigger初始化cron表达式

scheduler启动定时任务

package com.gaozhen.webservicedemo.config;

import com.gaozhen.webservicedemo.service.ScheduledTask;
import org.quartz.Trigger;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.quartz.CronTriggerFactoryBean;
import org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean;
import org.springframework.scheduling.quartz.SchedulerFactoryBean;

import java.util.Date;


@Configuration
public class QuartzConfig {

    
    @Bean(name = "jobDetail")
    public MethodInvokingJobDetailFactoryBean detailFactoryBean(ScheduledTask task){
        MethodInvokingJobDetailFactoryBean jobDetail = new MethodInvokingJobDetailFactoryBean();
        
        jobDetail.setConcurrent(false);
        //设置定时任务的名字
        jobDetail.setName("srd-demo");
        //设置任务的分组，这些属性都可以在数据库中，在多任务的时候使用
        jobDetail.setGroup("srd");

        //为需要执行的实体类对应的对象
        jobDetail.setTargetObject(task);

        
        jobDetail.setTargetMethod("sayHello");
        System.out.println("jobDetail 初始化成功！");
        return jobDetail;
    }

    
    @Bean(name = "jobTrigger")
    public CronTriggerFactoryBean cronTriggerFactoryBean(MethodInvokingJobDetailFactoryBean jobDetail){
        CronTriggerFactoryBean trigger = new CronTriggerFactoryBean();
        trigger.setJobDetail(jobDetail.getObject());
//        trigger.setStartTime(new Date());
        //初始化的cron表达式(每天上午10:15触发)
        trigger.setCronexpression("00 31 14 01 11 ?");

        trigger.setCronexpression("0 30 20 * * ?");// 初始时的cron表达式
        //trigger的name
        trigger.setName("srd-demo");
        System.out.println("jobTrigger 初始化成功！");
        return trigger;
    }

    
    @Bean(name = "scheduler")
    public SchedulerFactoryBean schedulerFactoryBean(Trigger trigger){
        SchedulerFactoryBean factoryBean = new SchedulerFactoryBean();
        //用于quartz集群，QuartzScheduler启动时更新已存在的job
        factoryBean.setOverwriteExistingJobs(true);
        //延时启动，应用启动1秒后
        factoryBean.setStartupDelay(1);
        //注册触发器
        factoryBean.setTriggers(trigger);
        System.out.println("scheduler 初始化成功！");
        return factoryBean;
    }
}

3、根据初始化注册的信息找到当前定时任务更新cron表达式，并重新执行

package com.gaozhen.webservicedemo.controller;

import com.gaozhen.webservicedemo.config.TestRun;
import com.gaozhen.webservicedemo.service.UserService;
import com.gaozhen.webservicedemo.util.CronUtil;
import com.gaozhen.webservicedemo.vo.User;
import org.quartz.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

@RestController
public class TestController {


    @Resource(name = "jobDetail")
    private JobDetail jobDetail;

    @Resource(name = "jobTrigger")
    private CronTrigger cronTrigger;

    @Resource(name = "scheduler")
    private Scheduler scheduler;



    @GetMapping("/cron")
    public String cron(String time)  throws SchedulerException {
        CronTrigger trigger = (CronTrigger) scheduler.getTrigger(cronTrigger.getKey());

        SimpleDateFormat simpleDateFormat =new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date date =null;
        try {
            date = simpleDateFormat.parse(time);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        String searchCron=CronUtil.getCron(date);

        System.out.println(searchCron);
        //表达式调度构建器
        CronScheduleBuilder scheduleBuilder = CronScheduleBuilder.cronSchedule(searchCron);
        //按新的cronexpression表达式重新构建trigger
        trigger = (CronTrigger) scheduler.getTrigger(cronTrigger.getKey());
        trigger = trigger.getTriggerBuilder().withIdentity(cronTrigger.getKey()).withSchedule(scheduleBuilder).build();
        // 按新的trigger重新设置job执行
        scheduler.rescheduleJob(cronTrigger.getKey(), trigger);
        return "ok";
    }


}