springboot有自带的定时任务为什么还要使用quartz
使用springboot自带的定时任务可以很简单很方便的完成一些简单的定时任务，但是我们想动态的执行我们的定时任务就比较困难了。然而使用quartz却可以很容易的管理我们的定时任务，很容易动态的操作定时任务。下面我们就讲解下如何使用quartz动态实现定时任务！
首先来一张截图看看我们的目录结构
pom.xml引入依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--quartz相关依赖-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-quartz</artifactId>
</dependency>
<!--lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
MyJob实现Job接口,重写execute方法在里面操作我们要执行的业务逻辑。
@Slf4j
public class MyJob implements Job {
@Autowired
private MyService myService;
@Override
public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException {
log.info("任务开始执行了");
try {
executeTask();
} catch (SchedulerException e) {
e.printStackTrace();
}
log.info("任务执行结束了");
}
private void executeTask() throws SchedulerException {
myService.bizFunction();
}
}
定义QuartzManager管理我们的定时任务方法
**
* @author 天空蓝蓝的
*/
@Configuration
public class QuartzManager {
public static final String JOB1="job1";
public static final String GROUP1="group1";
/**默认每个星期凌晨一点执行*/
//public static final String DEFAULT_CRON="0 0 1 ? * L";
/**默认5秒执行一次*/
public static final String DEFAULT_CRON="*/5 * * * * ?";
/**
* 任务调度
*/
@Autowired
private Scheduler scheduler;
/**
* 开始执行定时任务
*/
public void startJob() throws SchedulerException {
startJobTask(scheduler);
scheduler.start();
}
/**
* 启动定时任务
* @param scheduler
*/
private void startJobTask(Scheduler scheduler) throws SchedulerException {
JobDetail jobDetail= JobBuilder.newJob(MyJob.class).withIdentity(JOB1,GROUP1).build();
CronScheduleBuilder cronScheduleBuilder=CronScheduleBuilder.cronSchedule(DEFAULT_CRON);
CronTrigger cronTrigger=TriggerBuilder.newTrigger().withIdentity(JOB1,GROUP1)
.withSchedule(cronScheduleBuilder).build();
scheduler.scheduleJob(jobDetail,cronTrigger);
}
/**
* 获取Job信息
* @param name
* @param group
*/
public String getjobInfo(String name,String group) throws SchedulerException {
TriggerKey triggerKey=new TriggerKey(name,group);
CronTrigger cronTrigger= (CronTrigger) scheduler.getTrigger(triggerKey);
return String.format("time:%s,state:%s",cronTrigger.getCronExpression(),
scheduler.getTriggerState(triggerKey).name());
}
/**
* 修改任务的执行时间
* @param name
* @param group
* @param cron cron表达式
* @return
* @throws SchedulerException
*/
public boolean modifyJob(String name,String group,String cron) throws SchedulerException{
Date date=null;
TriggerKey triggerKey=new TriggerKey(name, group);
CronTrigger cronTrigger= (CronTrigger) scheduler.getTrigger(triggerKey);
String oldTime=cronTrigger.getCronExpression();
if (!oldTime.equalsIgnoreCase(cron)){
CronScheduleBuilder cronScheduleBuilder=CronScheduleBuilder.cronSchedule(cron);
CronTrigger trigger=TriggerBuilder.newTrigger().withIdentity(name,group)
.withSchedule(cronScheduleBuilder).build();
date=scheduler.rescheduleJob(triggerKey,trigger);
}
return date !=null;
}
/**
* 暂停所有任务
* @throws SchedulerException
*/
public void pauseAllJob()throws SchedulerException{
scheduler.pauseAll();
}
/**
* 暂停某个任务
* @param name
* @param group
* @throws SchedulerException
*/
public void pauseJob(String name,String group)throws SchedulerException{
JobKey jobKey=new JobKey(name,group);
JobDetail jobDetail=scheduler.getJobDetail(jobKey);
if (jobDetail==null)
return;
scheduler.pauseJob(jobKey);
}
/**
* 恢复所有任务
* @throws SchedulerException
*/
public void resumeAllJob()throws SchedulerException{
scheduler.resumeAll();
}
/**
* 恢复某个任务
*/
public void resumeJob(String name,String group)throws SchedulerException{
JobKey jobKey=new JobKey(name,group);
JobDetail jobDetail=scheduler.getJobDetail(jobKey);
if (jobDetail==null)
return;
scheduler.resumeJob(jobKey);
}
/**
* 删除某个任务
* @param name
* @param group
* @throws SchedulerException
*/
public void deleteJob(String name,String group)throws SchedulerException{
JobKey jobKey=new JobKey(name, group);
JobDetail jobDetail=scheduler.getJobDetail(jobKey);
if (jobDetail==null)
return;
scheduler.deleteJob(jobKey);
}
}
定义ApplicationStartQuartzJobListener实现当应用启动,或刷新时，启动我们的定时任务
/**
* @author 天空蓝蓝的
*/
@Slf4j
@Configuration
public class ApplicationStartQuartzJobListener implements ApplicationListener<ContextRefreshedEvent> {
@Autowired
private QuartzManager quartzManager;
@Override
public void onApplicationEvent(ContextRefreshedEvent contextRefreshedEvent) {
try {
quartzManager.startJob();
log.info("任务已经启动......");
} catch (SchedulerException e) {
e.printStackTrace();
}
}
/**
* 初始注入scheduler
*/
@Bean
public Scheduler scheduler() throws SchedulerException{
SchedulerFactory schedulerFactoryBean = new StdSchedulerFactory();
return schedulerFactoryBean.getScheduler();
}
}
定义MyJobFactory创建Quartz实例
/**
* @author 天空蓝蓝的
*/
@Component
public class MyJobFactory extends AdaptableJobFactory{
@Autowired
private AutowireCapableBeanFactory capableBeanFactory;
@Override
protected Object createJobInstance(TriggerFiredBundle bundle) throws Exception {
// 调用父类的方法
Object jobInstance = super.createJobInstance(bundle);
// 进行注入
capableBeanFactory.autowireBean(jobInstance);
return jobInstance;
}
}
Application如何类Start注入MyJobFactory和Scheduler
/**
* @author 天空蓝蓝的
*/
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
@Configuration
public class Start {
public static void main(String[] args) {
SpringApplication.run(Start.class, args);
}
@Autowired
private MyJobFactory myJobFactory;
@Bean
public SchedulerFactoryBean schedulerFactoryBean() {
SchedulerFactoryBean schedulerFactoryBean = new SchedulerFactoryBean();
schedulerFactoryBean.setJobFactory(myJobFactory);
System.out.println("myJobFactory:"+myJobFactory);
return schedulerFactoryBean;
}
@Bean
public Scheduler scheduler() {
return schedulerFactoryBean().getScheduler();
}
}
定义ModifyCronController动态修改定时任务
/**
* @author 天空蓝蓝的
*/
@RestController
public class ModifyCronController {
@Autowired
private QuartzManager quartzManager;
@GetMapping("modify")
public String modify() throws SchedulerException {
/**10秒执行一次*/
String cron="*/10 * * * * ?";
quartzManager.pauseJob(QuartzManager.JOB1,QuartzManager.GROUP1);
quartzManager.modifyJob(QuartzManager.JOB1,QuartzManager.GROUP1,cron);
return "ok";
}
}