springboot動態定時任務

SpringBoot設置動態定時任務

1、說明

1.在咱們平常的開發中，不少時候，定時任務都不是寫死的，而是寫到數據庫中，從而實現定時任務的動態配置。

2.定時任務執行時間可根據數據庫中某個設置字段動態改變。

 

2、maven依賴

 

<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

 

3、代碼

1.輸出測試類

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配置類

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：配置定時任務 
     */  
    @Bean(name = "jobDetail")  
    public MethodInvokingJobDetailFactoryBean detailFactoryBean(ScheduledJob task) {// ScheduleTask爲須要執行的任務  
        MethodInvokingJobDetailFactoryBean jobDetail = new MethodInvokingJobDetailFactoryBean();  
        /* 
         *  是否併發執行 
         *  例如每5s執行一次任務，可是當前任務尚未執行完，就已通過了5s了， 
         *  若是此處爲true，則下一個任務會執行，若是此處爲false，則下一個任務會等待上一個任務執行完後，再開始執行 
         */  
        jobDetail.setConcurrent(false);  
          
        jobDetail.setName("srd-chhliu");// 設置任務的名字  
        jobDetail.setGroup("srd");// 設置任務的分組，這些屬性均可以存儲在數據庫中，在多任務的時候使用  
          
        /* 
         * 爲須要執行的實體類對應的對象 
         */  
        jobDetail.setTargetObject(task);  
          
        /* 
         * sayHello爲須要執行的方法 
         * 經過這幾個配置，告訴JobDetailFactoryBean咱們須要執行定時執行ScheduleTask類中的sayHello方法 
         */  
        jobDetail.setTargetMethod("execute");  
        return jobDetail;  
    }  
      
    /** 
     * attention: 
     * Details：配置定時任務的觸發器，也就是何時觸發執行定時任務 
     */  
    @Bean(name = "jobTrigger")  
    public CronTriggerFactoryBean cronJobTrigger(MethodInvokingJobDetailFactoryBean jobDetail) {  
        CronTriggerFactoryBean tigger = new CronTriggerFactoryBean();  
        tigger.setJobDetail(jobDetail.getObject());  
        tigger.setCronExpression("0 10 15 * * ?");// 初始時的cron表達式  
        tigger.setName("srd-chhliu");// trigger的name  
        return tigger;  
  
    }  
  
    /** 
     * attention: 
     * Details：定義quartz調度工廠 
     */  
    @Bean(name = "schedulerTwo")  
    public SchedulerFactoryBean schedulerFactory(Trigger cronJobTrigger) {  
        SchedulerFactoryBean bean = new SchedulerFactoryBean();  
        // 用於quartz集羣,QuartzScheduler 啓動時更新己存在的Job  
        bean.setOverwriteExistingJobs(true);  
        // 延時啓動，應用啓動1秒後  
        bean.setStartupDelay(1);  
        // 註冊觸發器  
        bean.setTriggers(cronJobTrigger);  
        return bean;  
    }  
}

View Code

3.定時請求數據庫獲取時間類 注意sql語句的更改及判斷 查詢頻率可自行更改

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查庫，並根據查詢結果決定是否從新設置定時任務  
    public void scheduleUpdateCronTrigger() throws SchedulerException {  
        CronTrigger trigger = (CronTrigger) scheduler.getTrigger(cronTrigger.getKey());  
        String currentCron = trigger.getCronExpression();// 當前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)) {  
            // 若是當前使用的cron表達式和從數據庫中查詢出來的cron表達式一致，則不刷新任務  
        } else {  
            // 表達式調度構建器  
            CronScheduleBuilder scheduleBuilder = CronScheduleBuilder.cronSchedule(cron);  
            // 按新的cronExpression表達式從新構建trigger  
            trigger = (CronTrigger) scheduler.getTrigger(cronTrigger.getKey());  
            trigger = trigger.getTriggerBuilder().withIdentity(cronTrigger.getKey())  
                    .withSchedule(scheduleBuilder).build();  
            // 按新的trigger從新設置job執行  
            scheduler.rescheduleJob(cronTrigger.getKey(), trigger);  
            currentCron = cron;  
        }  
    }  
}

View Code

 

4、注意

QuartzConfigration類中的detailFactoryBean（ScheduledJob）

ScheduledJob就是咱們的輸出測試類