Quartz 2.2 的实现原理和运行过程, 请阅读我的另一篇文章：http://blog.csdn.net/xlxxcc/article/details/52104463

下面直接上代码：
QuartzManager.java 动态添加、修改和删除定时任务管理类

import org.quartz.CronScheduleBuilder;
import org.quartz.CronTrigger;
import org.quartz.Job;
import org.quartz.JobBuilder;
import org.quartz.JobDetail;
import org.quartz.JobKey;
import org.quartz.Scheduler;
import org.quartz.SchedulerFactory;
import org.quartz.Trigger;
import org.quartz.TriggerBuilder;
import org.quartz.TriggerKey;
import org.quartz.impl.StdSchedulerFactory;public class QuartzManager {private static SchedulerFactory schedulerFactory = new StdSchedulerFactory();  /** * @Description: 添加一个定时任务 *  * @param jobName 任务名 * @param jobGroupName  任务组名 * @param triggerName 触发器名 * @param triggerGroupName 触发器组名 * @param jobClass  任务 * @param cron   时间设置，参考quartz说明文档  */  @SuppressWarnings({ "unchecked", "rawtypes" })  public static void addJob(String jobName, String jobGroupName, String triggerName, String triggerGroupName, Class jobClass, String cron) {  try {  Scheduler sched = schedulerFactory.getScheduler();  // 任务名，任务组，任务执行类JobDetail jobDetail= JobBuilder.newJob(jobClass).withIdentity(jobName, jobGroupName).build();// 触发器  TriggerBuilder<Trigger> triggerBuilder = TriggerBuilder.newTrigger();// 触发器名,触发器组  triggerBuilder.withIdentity(triggerName, triggerGroupName);triggerBuilder.startNow();// 触发器时间设定  triggerBuilder.withSchedule(CronScheduleBuilder.cronSchedule(cron));// 创建Trigger对象CronTrigger trigger = (CronTrigger) triggerBuilder.build();// 调度容器设置JobDetail和Triggersched.scheduleJob(jobDetail, trigger);  // 启动  if (!sched.isShutdown()) {  sched.start();  }  } catch (Exception e) {  throw new RuntimeException(e);  }  }  /** * @Description: 修改一个任务的触发时间*  * @param jobName * @param jobGroupName* @param triggerName 触发器名* @param triggerGroupName 触发器组名 * @param cron   时间设置，参考quartz说明文档   */  public static void modifyJobTime(String jobName, String jobGroupName, String triggerName, String triggerGroupName, String cron) {  try {  Scheduler sched = schedulerFactory.getScheduler();  TriggerKey triggerKey = TriggerKey.triggerKey(triggerName, triggerGroupName);CronTrigger trigger = (CronTrigger) sched.getTrigger(triggerKey);  if (trigger == null) {  return;  }  String oldTime = trigger.getCronExpression();  if (!oldTime.equalsIgnoreCase(cron)) { /** 方式一 ：调用 rescheduleJob 开始 */// 触发器  TriggerBuilder<Trigger> triggerBuilder = TriggerBuilder.newTrigger();// 触发器名,触发器组  triggerBuilder.withIdentity(triggerName, triggerGroupName);triggerBuilder.startNow();// 触发器时间设定  triggerBuilder.withSchedule(CronScheduleBuilder.cronSchedule(cron));// 创建Trigger对象trigger = (CronTrigger) triggerBuilder.build();// 方式一 ：修改一个任务的触发时间sched.rescheduleJob(triggerKey, trigger);/** 方式一 ：调用 rescheduleJob 结束 *//** 方式二：先删除，然后在创建一个新的Job  *///JobDetail jobDetail = sched.getJobDetail(JobKey.jobKey(jobName, jobGroupName));  //Class<? extends Job> jobClass = jobDetail.getJobClass();  //removeJob(jobName, jobGroupName, triggerName, triggerGroupName);  //addJob(jobName, jobGroupName, triggerName, triggerGroupName, jobClass, cron); /** 方式二 ：先删除，然后在创建一个新的Job */}  } catch (Exception e) {  throw new RuntimeException(e);  }  }  /** * @Description: 移除一个任务 *  * @param jobName * @param jobGroupName * @param triggerName * @param triggerGroupName */  public static void removeJob(String jobName, String jobGroupName,  String triggerName, String triggerGroupName) {  try {  Scheduler sched = schedulerFactory.getScheduler();  TriggerKey triggerKey = TriggerKey.triggerKey(triggerName, triggerGroupName);sched.pauseTrigger(triggerKey);// 停止触发器  sched.unscheduleJob(triggerKey);// 移除触发器  sched.deleteJob(JobKey.jobKey(jobName, jobGroupName));// 删除任务  } catch (Exception e) {  throw new RuntimeException(e);  }  }  /** * @Description:启动所有定时任务 */  public static void startJobs() {  try {  Scheduler sched = schedulerFactory.getScheduler();  sched.start();  } catch (Exception e) {  throw new RuntimeException(e);  }  }  /** * @Description:关闭所有定时任务 */  public static void shutdownJobs() {  try {  Scheduler sched = schedulerFactory.getScheduler();  if (!sched.isShutdown()) {  sched.shutdown();  }  } catch (Exception e) {  throw new RuntimeException(e);  }  }  
}

MyJob.java 任务类

import java.util.Date;import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;public class MyJob implements Job{public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException {System.out.println(new Date() + ": doing something...");}
}

Test.Java 测试类

public class Test {public static String JOB_NAME = "动态任务调度";  public static String TRIGGER_NAME = "动态任务触发器";  public static String JOB_GROUP_NAME = "XLXXCC_JOB_GROUP";  public static String TRIGGER_GROUP_NAME = "XLXXCC_JOB_GROUP"; public static void main(String[] args) {try {  System.out.println("【系统启动】开始(每1秒输出一次)...");    QuartzManager.addJob(JOB_NAME, JOB_GROUP_NAME, TRIGGER_NAME, TRIGGER_GROUP_NAME, MyJob.class, "0/1 * * * * ?");    Thread.sleep(5000);    System.out.println("【修改时间】开始(每5秒输出一次)...");    QuartzManager.modifyJobTime(JOB_NAME, JOB_GROUP_NAME, TRIGGER_NAME, TRIGGER_GROUP_NAME, "0/5 * * * * ?");    Thread.sleep(6000);    System.out.println("【移除定时】开始...");    QuartzManager.removeJob(JOB_NAME, JOB_GROUP_NAME, TRIGGER_NAME, TRIGGER_GROUP_NAME);    System.out.println("【移除定时】成功");    } catch (Exception e) {  e.printStackTrace();  }  }
}