springboot动态定时任务

SpringBoot设置动态定时任务

一、说明

1.在我们日常的开发中,很多时候,定时任务都不是写死的,而是写到数据库中,从而实现定时任务的动态配置。

2.定时任务执行时间可根据数据库中某个设置字段动态改变。

 

二、maven依赖

 

<dependency>
            <groupId>org.quartz-scheduler</groupId>  
            <artifactId>quartz</artifactId>  
            <version>2.2.1</version>  
        </dependency>
        <dependency>
            <groupId>org.quartz-scheduler</groupId>
            <artifactId>quartz-jobs</artifactId>
            <version>2.2.1</version>
        </dependency>   
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
        </dependency>
View Code

 

三、代码

1.输出测试类

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


@Component
@Configuration
@EnableScheduling
public class ScheduledJob {

    public void execute() throws JobExecutionException {

        System.out.println("hahaha");
    }

}
ScheduledJob

2.Quartz配置类

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;

@Configuration
public class QuartzConfigration {
    /** 
     * attention: 
     * Details:配置定时任务 
     */  
    @Bean(name = "jobDetail")  
    public MethodInvokingJobDetailFactoryBean detailFactoryBean(ScheduledJob task) {// ScheduleTask为需要执行的任务  
        MethodInvokingJobDetailFactoryBean jobDetail = new MethodInvokingJobDetailFactoryBean();  
        /* 
         *  是否并发执行 
         *  例如每5s执行一次任务,但是当前任务还没有执行完,就已经过了5s了, 
         *  如果此处为true,则下一个任务会执行,如果此处为false,则下一个任务会等待上一个任务执行完后,再开始执行 
         */  
        jobDetail.setConcurrent(false);  
          
        jobDetail.setName("srd-chhliu");// 设置任务的名字  
        jobDetail.setGroup("srd");// 设置任务的分组,这些属性都可以存储在数据库中,在多任务的时候使用  
          
        /* 
         * 为需要执行的实体类对应的对象 
         */  
        jobDetail.setTargetObject(task);  
          
        /* 
         * sayHello为需要执行的方法 
         * 通过这几个配置,告诉JobDetailFactoryBean我们需要执行定时执行ScheduleTask类中的sayHello方法 
         */  
        jobDetail.setTargetMethod("execute");  
        return jobDetail;  
    }  
      
    /** 
     * attention: 
     * Details:配置定时任务的触发器,也就是什么时候触发执行定时任务 
     */  
    @Bean(name = "jobTrigger")  
    public CronTriggerFactoryBean cronJobTrigger(MethodInvokingJobDetailFactoryBean jobDetail) {  
        CronTriggerFactoryBean tigger = new CronTriggerFactoryBean();  
        tigger.setJobDetail(jobDetail.getObject());  
        tigger.setCronExpression("0 10 15 * * ?");// 初始时的cron表达式  
        tigger.setName("srd-chhliu");// trigger的name  
        return tigger;  
  
    }  
  
    /** 
     * attention: 
     * Details:定义quartz调度工厂 
     */  
    @Bean(name = "schedulerTwo")  
    public SchedulerFactoryBean schedulerFactory(Trigger cronJobTrigger) {  
        SchedulerFactoryBean bean = new SchedulerFactoryBean();  
        // 用于quartz集群,QuartzScheduler 启动时更新己存在的Job  
        bean.setOverwriteExistingJobs(true);  
        // 延时启动,应用启动1秒后  
        bean.setStartupDelay(1);  
        // 注册触发器  
        bean.setTriggers(cronJobTrigger);  
        return bean;  
    }  
}
View Code

3.定时请求数据库获取时间类 注意sql语句的更改及判断 查询频率可自行更改

package com.jdkeji.shares.quartz;

import javax.annotation.Resource;

import org.mybatis.spring.SqlSessionTemplate;
import org.quartz.CronScheduleBuilder;
import org.quartz.CronTrigger;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import com.jdkeji.shares.config.model.BusinessConfig;

@Configuration  
@EnableScheduling  
@Component  
public class ScheduleRefreshDatabase {
    @Autowired  
    private SqlSessionTemplate st;  
  
    @Resource(name = "jobDetail")  
    private JobDetail jobDetail;  
  
    @Resource(name = "jobTrigger")  
    private CronTrigger cronTrigger;  
  
    @Resource(name = "schedulerTwo")  
    private Scheduler scheduler;  
  
    @Scheduled(fixedRate = 5000) // 每隔5s查库,并根据查询结果决定是否重新设置定时任务  
    public void scheduleUpdateCronTrigger() throws SchedulerException {  
        CronTrigger trigger = (CronTrigger) scheduler.getTrigger(cronTrigger.getKey());  
        String currentCron = trigger.getCronExpression();// 当前Trigger使用的  
        BusinessConfig bc = st.selectOne("BusinessConfig.selectByExample");
        System.out.println(currentCron);  
        
        String [] date = bc.getClxg().split(":");
        String cron = "0 " + date[1] + " " + date[0] + " * * ?";
        System.out.println(cron);
        if (currentCron.equals(cron)) {  
            // 如果当前使用的cron表达式和从数据库中查询出来的cron表达式一致,则不刷新任务  
        } else {  
            // 表达式调度构建器  
            CronScheduleBuilder scheduleBuilder = CronScheduleBuilder.cronSchedule(cron);  
            // 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);  
            currentCron = cron;  
        }  
    }  
}
View Code

 

四、注意

QuartzConfigration类中的detailFactoryBean(ScheduledJob)

ScheduledJob就是我们的输出测试类 

 

 

 

 

 

posted @ 2018-01-26 15:59  不再_单纯  阅读(7339)  评论(0编辑  收藏  举报