springboot整合Quartz实现动态配置定时任务的方法

<dependency>       <groupId>org.springframework.boot</groupId>       <artifactId>spring-boot-starter-data-jpa</artifactId>     </dependency>      <dependency><!-- 为了方便测试，此处使用了内存数据库 -->       <groupId>com.h2database</groupId>       <artifactId>h2</artifactId>       <scope>runtime</scope>     </dependency>     <dependency>       <groupId>org.springframework.boot</groupId>       <artifactId>spring-boot-starter-test</artifactId>       <scope>test</scope>     </dependency>          <dependency>       <groupId>org.quartz-scheduler</groupId>       <artifactId>quartz</artifactId>       <version>2.2.1</version>       <exclusions>         <exclusion>           <artifactId>slf4j-api</artifactId>           <groupId>org.slf4j</groupId>         </exclusion>       </exclusions>     </dependency>     <dependency><!-- 该依赖必加，里面有sping对schedule的支持 -->             <groupId>org.springframework</groupId>             <artifactId>spring-context-support</artifactId>     </dependency> 

# 服务器端口号  server.port=7902 # 是否生成ddl语句  spring.jpa.generate-ddl=false  # 是否打印sql语句  spring.jpa.show-sql=true  # 自动生成ddl，由于指定了具体的ddl，此处设置为none  spring.jpa.hibernate.ddl-auto=none  # 使用H2数据库  spring.datasource.platform=h2  # 指定生成数据库的schema文件位置  spring.datasource.schema=classpath:schema.sql  # 指定插入数据库语句的脚本位置  spring.datasource.data=classpath:data.sql  # 配置日志打印信息  logging.level.root=INFO  logging.level.org.hibernate=INFO  logging.level.org.hibernate.type.descriptor.sql.BasicBinder=TRACE  logging.level.org.hibernate.type.descriptor.sql.BasicExtractor=TRACE  logging.level.com.itmuch=DEBUG  

package com.chhliu.springboot.quartz.entity;  import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id;  @Entity public class Config {   @Id    @GeneratedValue(strategy = GenerationType.AUTO)    private Long id;     @Column    private String cron;    /**    * @return the id    */   public Long getId() {     return id;   }     ……此处省略getter和setter方法…… } 

package com.chhliu.springboot.quartz.entity;  import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.context.annotation.Configuration; import org.springframework.scheduling.annotation.EnableScheduling; import org.springframework.stereotype.Component;  @Configuration @Component // 此注解必加 @EnableScheduling // 此注解必加 public class ScheduleTask {   private static final Logger LOGGER = LoggerFactory.getLogger(ScheduleTask.class);   public void sayHello(){     LOGGER.info("Hello world, i'm the king of the world!!!");   } } 

package com.chhliu.springboot.quartz.entity;  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(ScheduleTask 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("sayHello");     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 30 20 * * ?");// 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 = "scheduler")   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;   } } 

package com.chhliu.springboot.quartz.entity;  import javax.annotation.Resource;  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.chhliu.springboot.quartz.repository.ConfigRepository;  @Configuration @EnableScheduling @Component public class ScheduleRefreshDatabase {   @Autowired   private ConfigRepository repository;    @Resource(name = "jobDetail")   private JobDetail jobDetail;    @Resource(name = "jobTrigger")   private CronTrigger cronTrigger;    @Resource(name = "scheduler")   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     String searchCron = repository.findOne(1L).getCron();// 从数据库查询出来的     System.out.println(currentCron);     System.out.println(searchCron);     if (currentCron.equals(searchCron)) {       // 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(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);       currentCron = searchCron;     }   } } 

insert into config(id,cron) values(1,'0 0/2 * * * ?'); # 每2分钟执行一次定时任务

drop table config if exists; create table config(   id bigint generated by default as identity,   cron varchar(40),   primary key(id) ); 

0 30 20 * * ? 0 0/2 * * * ? 2017-03-08 18:02:00.025 INFO 5328 --- [eduler_Worker-1] c.c.s.quartz.entity.ScheduleTask     : Hello world, i'm the king of the world!!! 2017-03-08 18:04:00.003 INFO 5328 --- [eduler_Worker-2] c.c.s.quartz.entity.ScheduleTask     : Hello world, i'm the king of the world!!! 2017-03-08 18:06:00.002 INFO 5328 --- [eduler_Worker-3] c.c.s.quartz.entity.ScheduleTask     : Hello world, i'm the king of the world!!! 2017-03-08 18:08:00.002 INFO 5328 --- [eduler_Worker-4] c.c.s.quartz.entity.ScheduleTask     : Hello world, i'm the king of the world!!!