Quartz定时器引用

    org.springframework.boot
    spring-boot-starter-quartz

1. 启动任务

   public void start(Class jobClass, String name, String group, String cron) {
       try {
           if (scheduler.checkExists(new JobKey(name, group))) {
               // 判断定时器是否存在，存在则删除
               this.delete(name, group);
           }
           // 通过JobBuilder构建JobDetail实例，JobDetail规定只能是实现Job接口的实例，JobDetail 是具体Job实例
           JobDetail jobDetail = JobBuilder.newJob((Class) jobClass).withIdentity(name, group).build();
           // 基于表达式构建触发器
           CronScheduleBuilder cronScheduleBuilder = CronScheduleBuilder.cronSchedule(cron);
           // CronTrigger表达式触发器 继承于Trigger，TriggerBuilder 用于构建触发器实例
           CronTrigger cronTrigger = TriggerBuilder.newTrigger()
                   .withIdentity(name, group)
                   .withSchedule(cronScheduleBuilder).build();
           scheduler.scheduleJob(jobDetail, cronTrigger);
           scheduler.start();
       } catch (Exception schedulerException) {
           throw new RuntimeException(schedulerExceptio
   n.getMessage());
       }
   }
   

2. 删除任务

   public void delete(String name, String group) {
       try {
           JobKey jobKey = new JobKey(name, group);
           JobDetail jobDetail = scheduler.getJobDetail(jobKey);
           if (jobDetail == null) {
               return;
           }
           scheduler.deleteJob(jobKey);
       } catch (SchedulerException schedulerException) {
           schedulerException.printStackTr
               ace();
       }
   }
   

3. 判断是否存在

   public Boolean checkExists(String name, String group) {
       try {
           return scheduler.checkExists(new JobKey(name, group));
       } catch (SchedulerException e) {
           return false;
       }
   }
   

​ cron在线表达式