Quartz学习——Quartz简单入门Demo（二）

梦里梦外; 2022-05-16 06:55 263阅读 0赞

要学习Quartz框架，首先大概了解了Quartz的基本知识后，在通过简单的例子入门，一步一个脚印的走下去。   
下面介绍Quartz入门的示例，由于Quartz的存储方式分为RAM和JDBC，分别对这两种进行简单的说明。并附上代码！   
首先需要添加Quartz的Jar包 ，我使用的是quartz.2.2.1版本！

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

1：RAM方式   
     1）：Job

package com.test.quartz.job;
    
    import org.quartz.Job;
    import org.quartz.JobExecutionContext;
    import org.quartz.JobExecutionException;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    import java.util.Date;
    
    /**
     * Created by o-zhengzhenhai on 2018/8/17.
     */
    public class RAMJob implements Job {
    
        private static Logger _log = LoggerFactory.getLogger(RAMJob.class);
    
        @Override
        public void execute(JobExecutionContext arg0) throws JobExecutionException {
    
            _log.info("Say hello to Quartz" + new Date());
        }
    
    }

2）：QuartzTest

package com.test.quartz.job;
    
    /**
     * Created by o-zhengzhenhai on 2018/8/17.
     */
    
    import org.quartz.*;
    import org.quartz.impl.StdSchedulerFactory;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    import java.util.Date;
    
    /**
     * This is a RAM Store Quartz!
     * @author dufy
     * @date 2017.02.04
     *
     */
    public class QuartzTest {
    
        private static Logger _log = LoggerFactory.getLogger(QuartzTest.class);
    
        public static void main(String[] args) throws SchedulerException {
            //1.创建Scheduler的工厂
            SchedulerFactory sf = new StdSchedulerFactory();
            //2.从工厂中获取调度器实例
            Scheduler scheduler = sf.getScheduler();
    
    
            //3.创建JobDetail
            JobDetail jb = JobBuilder.newJob(RAMJob.class)
                    .withDescription("this is a ram job") //job的描述
                    .withIdentity("ramJob", "ramGroup") //job 的name和group
                    .build();
    
            //任务运行的时间，SimpleSchedle类型触发器有效
            long time=  System.currentTimeMillis() + 3*1000L; //3秒后启动任务
            Date statTime = new Date(time);
    
            //4.创建Trigger
            //使用SimpleScheduleBuilder或者CronScheduleBuilder
            Trigger t = TriggerBuilder.newTrigger()
                    .withDescription("")
                    .withIdentity("ramTrigger", "ramTriggerGroup")
                    //.withSchedule(SimpleScheduleBuilder.simpleSchedule())
                    .startAt(statTime)  //默认当前时间启动
                    .withSchedule(CronScheduleBuilder.cronSchedule("0/2 * * * * ?")) //两秒执行一次
                    .build();
    
            //5.注册任务和定时器
            scheduler.scheduleJob(jb, t);
    
            //6.启动 调度器
            scheduler.start();
            _log.info("启动时间 ： " + new Date());
    
        }
    }

运行结果：   
SimpleScheduleBuilder：

![70][]

![70 1][]

从控制台可以看出，该任务2秒钟执行一次

2.JDBC方式

使用jdbc方式，就要配置quartz.properties文件，并且在开始的时候在数据库中新增表！   
我使用的数据库是mysql，数据库中表在[https://blog.csdn.net/baidu\_41669919/article/details/81773822][https_blog.csdn.net_baidu_41669919_article_details_81773822]里面有，需要的请在里面复制脚本进行数据库表创建！

#JDBC驱动
    org.quartz.dataSource.qzDS.driver:com.mysql.jdbc.Driver
    org.quartz.dataSource.qzDS.URL:jdbc:mysql://localhost:3306/quartz_test
    org.quartz.dataSource.qzDS.user:root
    org.quartz.dataSource.qzDS.password:root
    org.quartz.dataSource.qzDS.maxConnection:10

1）MyJob

package com.test.quartz.job;
    
    import java.text.SimpleDateFormat;
    import java.util.Date;
    
    import org.quartz.Job;
    import org.quartz.JobExecutionContext;
    import org.quartz.JobExecutionException;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    public class MyJdbcJob implements Job{
        private static final Logger log = LoggerFactory.getLogger(MyJob.class);
    
        @Override
        public void execute(JobExecutionContext context)throws JobExecutionException {
            log.info("MyJdbcJob is start ..................");
    
            log.info("Hello quzrtz  "+
                    new SimpleDateFormat("yyyy-MM-dd HH:mm:ss ").format(new Date()));
    
            log.info("MyJdbcJob is end .....................");
        }
    
    
    
    }

2）QuartzJdbcTest

package com.test.quartz.job;
    
    import java.text.ParseException;
    import java.util.List;
    
    import org.quartz.CronScheduleBuilder;
    import org.quartz.CronTrigger;
    import org.quartz.JobBuilder;
    import org.quartz.JobDetail;
    import org.quartz.JobKey;
    import org.quartz.Scheduler;
    import org.quartz.SchedulerException;
    import org.quartz.SchedulerFactory;
    import org.quartz.SimpleScheduleBuilder;
    import org.quartz.SimpleTrigger;
    import org.quartz.Trigger;
    import org.quartz.TriggerBuilder;
    import org.quartz.TriggerKey;
    import org.quartz.impl.StdSchedulerFactory;
    
    public class QuartzJdbcTest {
    
        public static void main(String[] args) throws SchedulerException,
                ParseException {
            startSchedule();
            //resumeJob();
        }
        /**
         * 开始一个simpleSchedule()调度
         */
        public static void startSchedule() {
            try {
                // 1、创建一个JobDetail实例，指定Quartz
                JobDetail jobDetail = JobBuilder.newJob(MyJob.class)
                // 任务执行类
                        .withIdentity("job1_1", "jGroup1")
                        // 任务名，任务组
                        .build();
    
    
                //触发器类型
                SimpleScheduleBuilder builder = SimpleScheduleBuilder
                        // 设置执行次数
                        .repeatSecondlyForTotalCount(5);
    
                //CronScheduleBuilder builder = CronScheduleBuilder.cronSchedule("0/2 * * * * ?");
                // 2、创建Trigger
                Trigger trigger = TriggerBuilder.newTrigger()
                        .withIdentity("trigger1_1", "tGroup1").startNow()
                        .withSchedule(builder)
                        .build();
    
                // 3、创建Scheduler
                Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler();
                scheduler.start();
                // 4、调度执行
                scheduler.scheduleJob(jobDetail, trigger);
                try {
                    Thread.sleep(60000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
    
                //关闭调度器
                scheduler.shutdown();
    
            } catch (SchedulerException e) {
                e.printStackTrace();
            }
        }
    
        /**
         * 从数据库中找到已经存在的job，并重新开户调度
         */
        public static void resumeJob() {
            try {
    
                SchedulerFactory schedulerFactory = new StdSchedulerFactory();
                Scheduler scheduler = schedulerFactory.getScheduler();
                JobKey jobKey = new JobKey("job1_1", "jGroup1");
                List<? extends Trigger> triggers = scheduler.getTriggersOfJob(jobKey);
                //SELECT TRIGGER_NAME, TRIGGER_GROUP FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND JOB_NAME = ? AND JOB_GROUP = ?
                // 重新恢复在jGroup1组中，名为job1_1的 job的触发器运行
                if(triggers.size() > 0){
                    for (Trigger tg : triggers) {
                        // 根据类型判断
                        if ((tg instanceof CronTrigger) || (tg instanceof SimpleTrigger)) {
                            // 恢复job运行
                            scheduler.resumeJob(jobKey);
                        }
                    }
                    scheduler.start();
                }
    
            } catch (Exception e) {
                e.printStackTrace();
    
            }
        }
    }

[70]: /images/20220516/19f970a4dd24498fb7fb2e8f9748cf1b.png
[70 1]: /images/20220516/245554abe4e64d7b97629d66074afad6.png
[https_blog.csdn.net_baidu_41669919_article_details_81773822]: https://blog.csdn.net/baidu_41669919/article/details/81773822