Spring Boot offers several conveniences for working with the Quartz scheduler, including the
spring-boot-starter-quartz “Starter”. If Quartz is available, a Scheduler is auto-configured (through the SchedulerFactoryBean abstraction).
Beans of the following types are automatically picked up and associated with the Scheduler:
• JobDetail: defines a particular Job. JobDetail instances can be built with the JobBuilder API.
• Calendar.
• Trigger: defines when a particular job is triggered.

SpringBoot提供了一些便捷的方法来和Quartz协同工作，这些方法里面包括`spring-boot-starter-quartz`这个启动器。如果Quartz可用，Scheduler会通过SchedulerFactoryBean这个工厂bean自动配置到SpringBoot里。
JobDetail、Calendar、Trigger这些类型的bean会被自动采集并关联到Scheduler上。
Jobs can define setters to inject data map properties. Regular beans can also be injected in a similar manner.

Job可以定义setter(也就是set方法)来注入配置信息。也可以用同样的方法注入普通的bean。

<!-- quartz 定时任务 -->
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-quartz</artifactId><version>2.2.6.RELEASE</version>
</dependency>

# spring的datasource等配置未贴出
spring:quartz:# 将任务等保存化到数据库job-store-type: jdbc# 程序结束时会等待quartz相关的内容结束wait-for-jobs-to-complete-on-shutdown: true# QuartzScheduler启动时更新己存在的Job,这样就不用每次修改targetObject后删除qrtz_job_details表对应记录overwrite-existing-jobs: true# 这里居然是个map，搞得智能提示都没有，佛了properties:org:quartz:# scheduler相关scheduler:# scheduler的实例名instanceName: schedulerinstanceId: AUTO# 持久化相关jobStore:class: org.quartz.impl.jdbcjobstore.JobStoreTXdriverDelegateClass: org.quartz.impl.jdbcjobstore.StdJDBCDelegate# 表示数据库中相关表是QRTZ_开头的tablePrefix: QRTZ_useProperties: false# 线程池相关threadPool:class: org.quartz.simpl.SimpleThreadPool# 线程数threadCount: 10# 线程优先级threadPriority: 5threadsInheritContextClassLoaderOfInitializingThread: true

/*** Quartz的相关配置，注册JobDetail和Trigger* 注意JobDetail和Trigger是org.quartz包下的，不是spring包下的，不要导入错误*/
@Configuration
public class QuartzConfig {@Beanpublic JobDetail jobDetail() {JobDetail jobDetail = JobBuilder.newJob(StartOfDayJob.class).withIdentity("start_of_day", "start_of_day").storeDurably().build();return jobDetail;}@Beanpublic Trigger trigger() {Trigger trigger = TriggerBuilder.newTrigger().forJob(jobDetail()).withIdentity("start_of_day", "start_of_day").startNow()// 每天0点执行.withSchedule(CronScheduleBuilder.cronSchedule("0 0 0 * * ?")).build();return trigger;}
}

@Component
public class StartOfDayJob extends QuartzJobBean {private StudentService studentService;@Autowiredpublic StartOfDayJob(StudentService studentService) {this.studentService = studentService;}@Overrideprotected void executeInternal(JobExecutionContext jobExecutionContext)throws JobExecutionException {// 任务的具体逻辑}
}

public class LeaveApplication {@TableId(type = IdType.AUTO)private Integer id;private Long proposerUsername;@JsonFormat( pattern = "yyyy-MM-dd HH:mm",timezone="GMT+8")private LocalDateTime startTime;@JsonFormat( pattern = "yyyy-MM-dd HH:mm",timezone="GMT+8")private LocalDateTime endTime;private String reason;private String state;private String disapprovedReason;private Long checkerUsername;private LocalDateTime checkTime;// 省略getter、setter
}

@Service
public class LeaveApplicationServiceImpl implements LeaveApplicationService {@Autowiredprivate Scheduler scheduler;// 省略其他方法与其他依赖/*** 添加job和trigger到scheduler*/private void addJobAndTrigger(LeaveApplication leaveApplication) {Long proposerUsername = leaveApplication.getProposerUsername();// 创建请假开始JobLocalDateTime startTime = leaveApplication.getStartTime();JobDetail startJobDetail = JobBuilder.newJob(LeaveStartJob.class)// 指定任务组名和任务名.withIdentity(leaveApplication.getStartTime().toString(),proposerUsername + "_start")// 添加一些参数，执行的时候用.usingJobData("username", proposerUsername).usingJobData("time", startTime.toString()).build();// 创建请假开始任务的触发器// 创建cron表达式指定任务执行的时间，由于请假时间是确定的，所以年月日时分秒都是确定的，这也符合任务只执行一次的要求。String startCron = String.format("%d %d %d %d %d ? %d",startTime.getSecond(),startTime.getMinute(),startTime.getHour(),startTime.getDayOfMonth(),startTime.getMonth().getValue(),startTime.getYear());CronTrigger startCronTrigger = TriggerBuilder.newTrigger()// 指定触发器组名和触发器名.withIdentity(leaveApplication.getStartTime().toString(),proposerUsername + "_start").withSchedule(CronScheduleBuilder.cronSchedule(startCron)).build();// 将job和trigger添加到scheduler里try {scheduler.scheduleJob(startJobDetail, startCronTrigger);} catch (SchedulerException e) {e.printStackTrace();throw new CustomizedException("添加请假任务失败");}}
}

@Component
public class LeaveStartJob extends QuartzJobBean {private Scheduler scheduler;private SystemUserMapperPlus systemUserMapperPlus;@Autowiredpublic LeaveStartJob(Scheduler scheduler,SystemUserMapperPlus systemUserMapperPlus) {this.scheduler = scheduler;this.systemUserMapperPlus = systemUserMapperPlus;}@Overrideprotected void executeInternal(JobExecutionContext jobExecutionContext)throws JobExecutionException {Trigger trigger = jobExecutionContext.getTrigger();JobDetail jobDetail = jobExecutionContext.getJobDetail();JobDataMap jobDataMap = jobDetail.getJobDataMap();// 将添加任务的时候存进去的数据拿出来long username = jobDataMap.getLongValue("username");LocalDateTime time = LocalDateTime.parse(jobDataMap.getString("time"));// 编写任务的逻辑// 执行之后删除任务try {// 暂停触发器的计时scheduler.pauseTrigger(trigger.getKey());// 移除触发器中的任务scheduler.unscheduleJob(trigger.getKey());// 删除任务scheduler.deleteJob(jobDetail.getKey());} catch (SchedulerException e) {e.printStackTrace();}}
}