学习使用Quartz,java

 

 

 

 

 

 

 

 

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Quartz官网

添加quartz到Java应用中很容易,只需要学习一些概念就可以开始。

首先需要 Quartz Core Library,quartz-version.jar。Quartz只需要很少是依赖,通常至少需要sl4f-api.jar。如果需要将schedualing data存进数据库,则需要c3p0 library。

You may also want the quartz-jobs jar file on your classpath - if you want to use any of the jobs "built into" quartz.

 You can download the full distribution (with examples, source, dependencies, doc, etc.).

1.添加Quartz到应用(maven)

  <dependency>
      <groupId>org.quartz-scheduler</groupId>
      <artifactId>quartz</artifactId>
      <version>2.2.1</version>
  </dependency>

2.使用quartz

2.1启动一个Scheduler

Schedulers 是由factories创建的。Schedulers可以立刻被用来调度jobs,但是只有在调用了.start()方法后,才开始执行单元。

//从工厂获取Scheduler实例

Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler();

//启动它

sheduler.start();

2.2  code with the Quartz Fluent Scheduling API

The Quartz API 被设计成向DSL(domain-specific language)一样流畅。如果采用静态地方法来引入API components 可以很轻松。(import 也可以static?)

import org.quartz.Scheduler;
  import org.quartz.SchedulerException;
  import org.quartz.impl.StdSchedulerFactory;
  import static org.quartz.JobBuilder.*;
  import static org.quartz.TriggerBuilder.*;
  import static org.quartz.SimpleScheduleBuilder.*;

完成上面操作后就可以实现Jobs,必须有一个.execute();方法。

public class MyJob implements org.quartz.Job {

      public MyJob() {
      }

      public void execute(JobExecutionContext context) throws JobExecutionException {
          System.err.println("Hello World!  MyJob is executing.");
      }
  }

之后可以用triggers来调度(schedule)这些jobs。trigger 是用来定义job该被哪个时间执行。

// define the job and tie it to our MyJob class(定义job并绑定到MyJob类)
  JobDetail job = newJob(MyJob.class)
      .withIdentity("job1", "group1")
      .build();

  // Trigger the job to run now, and then repeat every 40 seconds(job现在启动,然后设置为40秒重复一次)
  Trigger trigger = newTrigger()
      .withIdentity("trigger1", "group1")
      .startNow()
      .withSchedule(simpleSchedule()
              .withIntervalInSeconds(40)
              .repeatForever())
      .build();

  // Tell quartz to schedule the job using our trigger(告诉quarts用我们创建的trigger来调度job)
  scheduler.scheduleJob(job, trigger);

 



 

posted @ 2018-07-03 16:42  JasonChen92  阅读(209)  评论(0编辑  收藏  举报