选择课程：
第7课：TriggerListeners和JobListeners
选择一个特殊主题：
Before you can use the scheduler, it needs to be instantiated (who’d have guessed?). To do this, you use a SchedulerFactory. Some users of Quartz may keep an instance of a factory in a JNDI store, others may find it just as easy (or easier) to instantiate and use a factory instance directly (such as in the example below).
在使用调度程序之前，需要对其进行实例化（谁猜到了？）。为此，您使用SchedulerFactory。Quartz的一些用户可能会在JNDI存储中保留工厂的实例，其他用户可能会发现直接实例化和使用工厂实例（例如下面的示例）同样容易（或更容易）。
Once a scheduler is instantiated, it can be started, placed in stand-by mode, and shutdown. Note that once a scheduler is shutdown, it cannot be restarted without being re-instantiated. Triggers do not fire (jobs do not execute) until the scheduler has been started, nor while it is in the paused state.
一旦一个调度器被实例化，它就可以被启动、处于stand-by 模式以及关机。请注意，一旦调度程序关闭，就不能在不重新实例化的情况下重新启动它。触发器在启动调度器之前不会触发(作业不会执行)，也不会在调度器处于暂停状态时触发。
Here’s a quick snippet of code, that instantiates and starts a scheduler, and schedules a job for execution:
这里有一个快速的代码片段，它实例化并启动一个调度器，并为执行调度一个作业
SchedulerFactory schedFact = new org.quartz.impl.StdSchedulerFactory();
Scheduler sched = schedFact.getScheduler();
sched.start();
// define the job and tie it to our HelloJob class
JobDetail job = newJob(HelloJob.class)
.withIdentity("myJob", "group1")
.build();
// Trigger the job to run now, and then every 40 seconds
Trigger trigger = newTrigger()
.withIdentity("myTrigger", "group1")
.startNow()
.withSchedule(simpleSchedule()
.withIntervalInSeconds(40)
.repeatForever())
.build();
// Tell quartz to schedule the job using our trigger
sched.scheduleJob(job, trigger);