浅谈Scheduler
转载地址：https://www.cnblogs.com/qlqwjy/p/8721982.html
1.Scheduler工厂模式
所有的Scheduler实例应该由SchedulerFactory来创建2.SchedulerFactory类图
最常用的是StdSchedulerFactory工程类，其出那个键Scheduler的两种方式:
//3. 创建scheduler
Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler();
// 3. 创建scheduler
SchedulerFactory sfact = new StdSchedulerFactory();
Scheduler scheduler = sfact.getScheduler();
3. 回顾Quartz三个核心概念
调度器
任务
触发器
1个job对应多个Trigger
4.Scheduler的创建方式
StdSchedulerFactory:
使用一组参数（Java.util.Properties）来创建和初始化Quartz调度器
配置参数一般存储在quartz.properties中
调用getScheduler方法就能创建和初始化调度器对象
5..Scheduler的主要函数
// 绑定 jobDetail 和 trigger，将它注册进 Scheduler 当中 ,返回值是最近一次任务执行的开始时间 Date scheduleJob(JobDetail jobDetail, Trigger trigger) // 启动 Scheduler void start() // 暂停 Scheduler void standby() // 关闭 Scheduler void shutdown()
例一:测试:scheduleJob函数返回最近一次开始执行的时间
package cn.qlq.quartz;
import static org.quartz.JobBuilder.newJob;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.quartz.CronScheduleBuilder;
import org.quartz.CronTrigger;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerFactory;
import org.quartz.TriggerBuilder;
import org.quartz.impl.StdSchedulerFactory;
public class HelloScheduler {
public static void main(String[] args) {
try {
// 1. 创建一个JodDetail实例 将该实例与Hello job class绑定 (链式写法)
JobDetail jobDetail = newJob(HelloJob.class) // 定义Job类为HelloQuartz类，这是真正的执行逻辑所在
.withIdentity("myJob") // 定义name/group
.build();
// 打印当前的时间
SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
Date date = new Date();
System.out.println("current time is :" + sf.format(date));
// 2. 2018年内每天11点18开始执行，每隔5s执行一次
CronTrigger trigger = (CronTrigger) TriggerBuilder.newTrigger()
.withIdentity("myTrigger", "group1")// 定义名字和组
.withSchedule( //定义任务调度的时间间隔和次数
CronScheduleBuilder
.cronSchedule("0/5 0 14,18 * * ? *")
)
.build();
// 3. 创建scheduler
SchedulerFactory sfact = new StdSchedulerFactory();
Scheduler scheduler = sfact.getScheduler();
// 4. 将trigger和jobdetail加入这个调度
// scheduler.scheduleJob(jobDetail, trigger);
// 5. 启动scheduler
scheduler.start();
System.out.println("schedule time is:"+sf.format(scheduler.scheduleJob(jobDetail, trigger)));
} catch (Exception e) {
e.printStackTrace();
}
}
}
结果:
current time is :2018-04-05 11:42:42
schedule time is:2018-04-05 02:00:00
例二:测试standby()挂起Scheduler之后3s后再次开启Scheduler
package cn.qlq.quartz;
import static org.quartz.JobBuilder.newJob;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.quartz.CronScheduleBuilder;
import org.quartz.CronTrigger;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerFactory;
import org.quartz.TriggerBuilder;
import org.quartz.impl.StdSchedulerFactory;
public class HelloScheduler {
public static void main(String[] args) {
try {
// 1. 创建一个JodDetail实例 将该实例与Hello job class绑定 (链式写法)
JobDetail jobDetail = newJob(HelloJob.class) // 定义Job类为HelloQuartz类，这是真正的执行逻辑所在
.withIdentity("myJob") // 定义name/group
.build();
// 打印当前的时间
SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
Date date = new Date();
System.out.println("current time is :" + sf.format(date));
// 2. 2018年内每天11点18开始执行，每隔5s执行一次
CronTrigger trigger = (CronTrigger) TriggerBuilder.newTrigger()
.withIdentity("myTrigger", "group1")// 定义名字和组
.withSchedule( //定义任务调度的时间间隔和次数
CronScheduleBuilder
.cronSchedule("* * * * * ? *")
)
.build();
// 3. 创建scheduler
SchedulerFactory sfact = new StdSchedulerFactory();
Scheduler scheduler = sfact.getScheduler();
// 4. 将trigger和jobdetail加入这个调度
scheduler.scheduleJob(jobDetail, trigger);
// 5. 启动scheduler
scheduler.start();
//scheduler执行2s后挂起
Thread.sleep(2000);
scheduler.standby();
//scheduler挂起3s后再次启动scheduler
Thread.sleep(3000);
scheduler.start();
} catch (Exception e) {
e.printStackTrace();
}
}
}
结果：
current time is :2018-04-05 11:49:28 current exec time is :2018-04-05 11:49:28 current exec time is :2018-04-05 11:49:29 current exec time is :2018-04-05 11:49:30 current exec time is :2018-04-05 11:49:33 current exec time is :2018-04-05 11:49:33 current exec time is :2018-04-05 11:49:33 current exec time is :2018-04-05 11:49:34 current exec time is :2018-04-05 11:49:35 ....
例三:测试shutdown函数(shutdown之后不能再次调用start重启，会报错)
shutdown(true)表示等待所有正在执行的任务执行完毕后关闭Scheduler
shutdown(false),即shutdown()表示直接关闭Scheduler
(1)Job中睡眠5s钟
package cn.qlq.quartz;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
public class HelloJob implements Job {
public void execute(JobExecutionContext context) throws JobExecutionException {
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//打印当前的时间
SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
Date date = new Date();
System.out.println("current exec time is :"+sf.format(date));
}
}
shutdown传入true参数:(在程序执行完之后才杀死Scheduler)
package cn.qlq.quartz;
import static org.quartz.JobBuilder.newJob;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.quartz.CronScheduleBuilder;
import org.quartz.CronTrigger;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerFactory;
import org.quartz.TriggerBuilder;
import org.quartz.impl.StdSchedulerFactory;
public class HelloScheduler {
public static void main(String[] args) {
try {
// 1. 创建一个JodDetail实例 将该实例与Hello job class绑定 (链式写法)
JobDetail jobDetail = newJob(HelloJob.class) // 定义Job类为HelloQuartz类，这是真正的执行逻辑所在
.withIdentity("myJob") // 定义name/group
.build();
// 打印当前的时间
SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
Date date = new Date();
System.out.println("current time is :" + sf.format(date));
// 2. 2018年内每天11点18开始执行，每隔5s执行一次
CronTrigger trigger = (CronTrigger) TriggerBuilder.newTrigger()
.withIdentity("myTrigger", "group1")// 定义名字和组
.withSchedule( //定义任务调度的时间间隔和次数
CronScheduleBuilder
.cronSchedule("* * * * * ? *")
)
.build();
// 3. 创建scheduler
SchedulerFactory sfact = new StdSchedulerFactory();
Scheduler scheduler = sfact.getScheduler();
// 4. 将trigger和jobdetail加入这个调度
scheduler.scheduleJob(jobDetail, trigger);
// 5. 启动scheduler
scheduler.start();
//scheduler执行2s后挂起
Thread.sleep(2000);
scheduler.shutdown(true);
//shutdown(true)表示等待所有正在执行的任务执行完毕后关闭Scheduler
//shutdown(false),即shutdown()表示直接关闭Scheduler
System.out.println("scheduler is shutdown?"+scheduler.isShutdown());
} catch (Exception e) {
e.printStackTrace();
}
}
}
结果:
current time is :2018-04-05 11:58:25 current exec time is :2018-04-05 11:58:30 current exec time is :2018-04-05 11:58:31 current exec time is :2018-04-05 11:58:32 scheduler is shutdown?true
shutdown传入false参数:(立即杀死Scheduler)
package cn.qlq.quartz;
import static org.quartz.JobBuilder.newJob;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.quartz.CronScheduleBuilder;
import org.quartz.CronTrigger;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerFactory;
import org.quartz.TriggerBuilder;
import org.quartz.impl.StdSchedulerFactory;
public class HelloScheduler {
public static void main(String[] args) {
try {
// 1. 创建一个JodDetail实例 将该实例与Hello job class绑定 (链式写法)
JobDetail jobDetail = newJob(HelloJob.class) // 定义Job类为HelloQuartz类，这是真正的执行逻辑所在
.withIdentity("myJob") // 定义name/group
.build();
// 打印当前的时间
SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
Date date = new Date();
System.out.println("current time is :" + sf.format(date));
// 2. 2018年内每天11点18开始执行，每隔5s执行一次
CronTrigger trigger = (CronTrigger) TriggerBuilder.newTrigger()
.withIdentity("myTrigger", "group1")// 定义名字和组
.withSchedule( //定义任务调度的时间间隔和次数
CronScheduleBuilder
.cronSchedule("* * * * * ? *")
)
.build();
// 3. 创建scheduler
SchedulerFactory sfact = new StdSchedulerFactory();
Scheduler scheduler = sfact.getScheduler();
// 4. 将trigger和jobdetail加入这个调度
scheduler.scheduleJob(jobDetail, trigger);
// 5. 启动scheduler
scheduler.start();
//scheduler执行2s后挂起
Thread.sleep(2000);
scheduler.shutdown(false);
//shutdown(true)表示等待所有正在执行的任务执行完毕后关闭Scheduler
//shutdown(false),即shutdown()表示直接关闭Scheduler
System.out.println("scheduler is shutdown?"+scheduler.isShutdown());
} catch (Exception e) {
e.printStackTrace();
}
}
}
结果:
current time is :2018-04-05 12:00:11 scheduler is shutdown?true current exec time is :2018-04-05 12:00:17 current exec time is :2018-04-05 12:00:17 current exec time is :2018-04-05 12:00:18 current exec time is :2018-04-05 12:00:19