码农code之路要学习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！
Demo代码下载地址：quartz_demo
<!-- quartz -->
<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>一、RAM方式
要测试RAMdemo的代码，请先删除demo中这个quartz.properties文件，或者重命名！否则会测试不成功！
1、Job
package com.dufy.learn;
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 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.dufy.learn;
import java.util.Date;
import org.quartz.CronScheduleBuilder;
import org.quartz.JobBuilder;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.SchedulerFactory;
import org.quartz.SimpleScheduleBuilder;
import org.quartz.Trigger;
import org.quartz.TriggerBuilder;
import org.quartz.impl.StdSchedulerFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This is a RAM Store Quartz!
* @author dufy
* @date 2017.02.04
*
*/
public class RAMQuartz {
private static Logger _log = LoggerFactory.getLogger(RAMQuartz.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：
CronScheduleBuilder：
二、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quartz_demo里面有，需要的请在里面下载！
运行 tables_db2_v8.sql 这个文件。
#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:101、MyJob
package com.dufy.jdbctest;
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 MyJob implements Job{
private static final Logger log = LoggerFactory.getLogger(MyJob.class);
@Override
public void execute(JobExecutionContext context)throws JobExecutionException {
log.info("MyJob is start ..................");
log.info("Hello quzrtz "+
new SimpleDateFormat("yyyy-MM-dd HH:mm:ss ").format(new Date()));
log.info("MyJob is end .....................");
}
}2、QuartzJdbcTest
package com.dufy.jdbctest;
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();
}
}
}运行结果 ：数据库数据
控制台打印：
Cron和Simple类型，Simple类型的如果JobDetail没有设置.storeDurably(true)，则job在运行完成之后会在数据库中删除！
作者：阿飞云 | 来源：https://blog.csdn.net/u010648555/column/info/14251
