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JAVA基础应用——定时器 Quartz 的使用

Quartz

OpenSymphony开源组织在Job scheduling领域的开源项目,可以用来创建简单呈复杂的定时任务。

下载jar

网址:
​​​http://www.quartz-scheduler.org/​​​
我下载的是:quartz-2.2.3

1.创建定时任务类

/* 
* All content copyright Terracotta, Inc., unless otherwise indicated. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy
* of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
*/

package org.quartz.examples.example1;

import java.util.Date;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;

/**
* <p>
* This is just a simple job that says "Hello" to the world.
* </p>
*
* @author Bill Kratzer
*/
public class HelloJob implements Job {

private static Logger _log = LoggerFactory.getLogger(HelloJob.class);

/**
* <p>
* Empty constructor for job initilization
* </p>
* <p>
* Quartz requires a public empty constructor so that the
* scheduler can instantiate the class whenever it needs.
* </p>
*/
public HelloJob() {
}

/**
* <p>
* Called by the <code>{@link org.quartz.Scheduler}</code> when a
* <code>{@link org.quartz.Trigger}</code> fires that is associated with
* the <code>Job</code>.
* </p>
*
* @throws JobExecutionException
* if there is an exception while executing the job.
*/
public void execute(JobExecutionContext context)
throws JobExecutionException {

// Say Hello to the World and display the date/time
_log.info("Hello World! - " + new Date());
}

}

2.运行定时任务

/* 
* All content copyright Terracotta, Inc., unless otherwise indicated. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy
* of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
*/

package org.quartz.examples.example1;

import static org.quartz.DateBuilder.evenMinuteDate;
import static org.quartz.JobBuilder.newJob;
import static org.quartz.TriggerBuilder.newTrigger;

import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerFactory;
import org.quartz.Trigger;
import org.quartz.impl.StdSchedulerFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Date;

/**
* This Example will demonstrate how to start and shutdown the Quartz scheduler and how to schedule a job to run in
* Quartz.
*
* @author Bill Kratzer
*/
public class SimpleExample {

public void run() throws Exception {
Logger log = LoggerFactory.getLogger(SimpleExample.class);

log.info("------- Initializing ----------------------");

// First we must get a reference to a scheduler
SchedulerFactory sf = new StdSchedulerFactory();
Scheduler sched = sf.getScheduler();

log.info("------- Initialization Complete -----------");

// computer a time that is on the next round minute
Date runTime = evenMinuteDate(new Date());

log.info("------- Scheduling Job -------------------");

// define the job and tie it to our HelloJob class
JobDetail job = newJob(HelloJob.class).withIdentity("job1", "group1").build();

// Trigger the job to run on the next round minute
Trigger trigger = newTrigger().withIdentity("trigger1", "group1").startAt(runTime).build();

// Tell quartz to schedule the job using our trigger
sched.scheduleJob(job, trigger);
log.info(job.getKey() + " will run at: " + runTime);

// Start up the scheduler (nothing can actually run until the
// scheduler has been started)
sched.start();

log.info("------- Started Scheduler -----------------");

// wait long enough so that the scheduler as an opportunity to
// run the job!
log.info("------- Waiting 65 seconds... -------------");
try {
// wait 65 seconds to show job
Thread.sleep(65L * 1000L);
// executing...
} catch (Exception e) {
//
}

// shut down the scheduler
log.info("------- Shutting Down ---------------------");
sched.shutdown(true);
log.info("------- Shutdown Complete -----------------");
}

public static void main(String[] args) throws Exception {

SimpleExample example = new SimpleExample();
example.run();

}

}


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