JAVA调度框架Quartz2.2.x-快速入门

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本文详细介绍如何使用Quartz进行定时任务的设置与执行。从下载安装到代码实现，包括定义Job类、创建触发器和调度程序，最后通过实例演示如何让程序每隔10秒输出一次信息。

前言：鉴于网上的很多quartz教程都过时了，实际代码都不能用，所以贴上验证过可用的教程。


一.下载和安装
   直接下载最新版本（Download the most recent stable release）
   如果是maven项目，将下面依赖添加到pom.xml的dependencies

<dependency>
  <groupId>org.quartz-scheduler</groupId>
  <artifactId>quartz</artifactId>
  <version>2.2.3</version>
</dependency>
<dependency>
  <groupId>org.quartz-scheduler</groupId>
  <artifactId>quartz-jobs</artifactId>
  <version>2.2.3</version>
</dependency>

二. 开始写代码

1.定义了一个实现Job接口的类(HelloJob)

import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;


public class HelloJob implements Job {

    @Override
    public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException {
        System.out.println("Hello World.");
    }
}

2.定义一个类（UsingQuartz）执行调度程序


import org.quartz.*;
import org.quartz.impl.StdSchedulerFactory;



public class UsingQuartz {

    public static void main(String[] args) throws Exception {
        SchedulerFactory schedulerFactory = new StdSchedulerFactory();
        Scheduler scheduler = schedulerFactory.getScheduler();
        scheduler.start();

        // define the job and tie it to our HelloJob class
        JobDetail jobDetail = JobBuilder.newJob(HelloJob.class)
                .withIdentity("JOB_KEY", "group1")
                .build();

        // Trigger the job to run now, and then every 10 seconds
        Trigger trigger = TriggerBuilder.newTrigger()
                .withIdentity("TRIGGER_KEY", "group1")
                .startNow()
                .withSchedule(
                        SimpleScheduleBuilder.simpleSchedule()
                                .withIntervalInSeconds(10)
                                .repeatForever()
                )
                .build();

        //Tell quartz to schedule the job using our trigger
        scheduler.scheduleJob(jobDetail, trigger);
    }
}

3.在UsingQuartz类上右键，运行就能看到控制台每间隔10秒输出Hello World.

16:45:58.607 [main] INFO org.quartz.impl.StdSchedulerFactory - Using default implementation for ThreadExecutor
16:45:58.613 [main] INFO org.quartz.simpl.SimpleThreadPool - Job execution threads will use class loader of thread: main
16:45:58.637 [main] INFO org.quartz.core.SchedulerSignalerImpl - Initialized Scheduler Signaller of type: class org.quartz.core.SchedulerSignalerImpl
16:45:58.637 [main] INFO org.quartz.core.QuartzScheduler - Quartz Scheduler v.2.2.3 created.
16:45:58.638 [main] INFO org.quartz.simpl.RAMJobStore - RAMJobStore initialized.
16:45:58.640 [main] INFO org.quartz.core.QuartzScheduler - Scheduler meta-data: Quartz Scheduler (v2.2.3) 'DefaultQuartzScheduler' with instanceId 'NON_CLUSTERED'
  Scheduler class: 'org.quartz.core.QuartzScheduler' - running locally.
  NOT STARTED.
  Currently in standby mode.
  Number of jobs executed: 0
  Using thread pool 'org.quartz.simpl.SimpleThreadPool' - with 10 threads.
  Using job-store 'org.quartz.simpl.RAMJobStore' - which does not support persistence. and is not clustered.

16:45:58.640 [main] INFO org.quartz.impl.StdSchedulerFactory - Quartz scheduler 'DefaultQuartzScheduler' initialized from default resource file in Quartz package: 'quartz.properties'
16:45:58.640 [main] INFO org.quartz.impl.StdSchedulerFactory - Quartz scheduler version: 2.2.3
16:45:58.640 [main] INFO org.quartz.core.QuartzScheduler - Scheduler DefaultQuartzScheduler_$_NON_CLUSTERED started.
16:45:58.643 [DefaultQuartzScheduler_QuartzSchedulerThread] DEBUG org.quartz.core.QuartzSchedulerThread - batch acquisition of 0 triggers
16:45:58.658 [DefaultQuartzScheduler_QuartzSchedulerThread] DEBUG org.quartz.core.QuartzSchedulerThread - batch acquisition of 1 triggers
16:45:58.666 [DefaultQuartzScheduler_QuartzSchedulerThread] DEBUG org.quartz.simpl.PropertySettingJobFactory - Producing instance of Job 'group1.JOB_KEY', class=quartz.HelloJob
16:45:58.669 [DefaultQuartzScheduler_QuartzSchedulerThread] DEBUG org.quartz.core.QuartzSchedulerThread - batch acquisition of 1 triggers
16:45:58.670 [DefaultQuartzScheduler_Worker-1] DEBUG org.quartz.core.JobRunShell - Calling execute on job group1.JOB_KEY
Hello World.
16:46:08.648 [DefaultQuartzScheduler_QuartzSchedulerThread] DEBUG org.quartz.simpl.PropertySettingJobFactory - Producing instance of Job 'group1.JOB_KEY', class=quartz.HelloJob
16:46:08.648 [DefaultQuartzScheduler_QuartzSchedulerThread] DEBUG org.quartz.core.QuartzSchedulerThread - batch acquisition of 1 triggers
16:46:08.648 [DefaultQuartzScheduler_Worker-2] DEBUG org.quartz.core.JobRunShell - Calling execute on job group1.JOB_KEY
Hello World.