quartz 任务的增删改-优快云博客

本文介绍了一个基于Quartz实现的定时任务案例，包括任务执行类、任务管理类及如何进行任务的添加、修改和移除操作。通过具体代码示例展示了如何配置任务执行频率，并提供了完整的测试流程。

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从网上找了好多例子，要么太老，要么用不了。无奈，硬着头皮自己来一个。希望对路过的朋友有帮助。。。

QuartzJob

import java.text.SimpleDateFormat;
import java.util.Date;

import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;

/**
 * @Description: 任务执行类
 *
 * @author 那是一条神奇的天路
 * @date 2015-12-22
 * @version V1.0
 */
public class QuartzJob implements Job {

  public void execute(JobExecutionContext arg0) throws JobExecutionException {
    System.out.println(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date())+ "★★★★★★★★★★★");  
  }
}

QuartzManager

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.SchedulerFactory;
import org.quartz.Trigger;
import org.quartz.TriggerBuilder;
import org.quartz.TriggerKey;
import org.quartz.impl.StdSchedulerFactory;

/**
 * @Description: 任务执行类
 *
 * @author 那是一条神奇的天路
 * @date 2015-12-22
 * @version V1.0
 */
public class QuartzManager {
  private static SchedulerFactory schedulerFactory = new StdSchedulerFactory();
  private static String JOB_GROUP_NAME = "EXTJWEB_JOBGROUP_NAME";
  private static String TRIGGER_GROUP_NAME = "EXTJWEB_TRIGGERGROUP_NAME";

  /**
   * 添加一个定时任务，使用默认的任务组名，触发器名，触发器组名
   * 
   * @param jobName 任务名
   * @param cls 任务
   * @param time 时间设置，参考quartz说明文档
   */
  public static void addJob(String jobName, Class cls, String time) {
    try {
        Scheduler scheduler = schedulerFactory.getScheduler();//创建一个触发器表
        JobDetail jobDetail = JobBuilder.newJob()//创建一个jobbuilder用来定义一个任务明细。
                .ofType(cls)//设置类，将被实例化
                .withIdentity(new JobKey(jobName, JOB_GROUP_NAME))//使用给定的名称和默认组jobkey识别任务明细
                .build();//产品定义的JobDetail实例这jobbuilder。
 
        Trigger trigger = TriggerBuilder.newTrigger()
                .withSchedule(CronScheduleBuilder.cronSchedule(time))//设置schedulebuilder将用于定义触发器的表。
                .withIdentity(new TriggerKey(jobName, TRIGGER_GROUP_NAME))
                .build();//创建Trigger
 
        scheduler.scheduleJob(jobDetail,trigger);//绑定
 
      // 启动
      if (!scheduler.isShutdown()) {
    	 // scheduler.start();
      }
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
  }

  /**
   * 修改一个任务的触发时间(使用默认的任务组名，触发器名，触发器组名)
   * @param jobName
   * @param time
   */
  @SuppressWarnings("unchecked")
  public static void modifyJobTime(String jobName, String time ) {
    try {
      Scheduler sched = schedulerFactory.getScheduler();
      
      
      Trigger trigger = TriggerBuilder.newTrigger()
              .withSchedule(CronScheduleBuilder.cronSchedule(time))//设置schedulebuilder将用于定义触发器的表。
              .withIdentity(new TriggerKey(jobName, TRIGGER_GROUP_NAME))
              .build();//创建Trigger
      
      if (trigger == null) {
        return;
      }
      String oldTime = ((CronTrigger) trigger).getCronExpression();
      if (!oldTime.equalsIgnoreCase(time)) {
        JobDetail jobDetail = sched.getJobDetail(new JobKey(jobName, JOB_GROUP_NAME)) ;
        Class objJobClass = jobDetail.getJobClass();
        removeJob(new TriggerKey(jobName, TRIGGER_GROUP_NAME),new JobKey(jobName, JOB_GROUP_NAME));
        addJob(jobName, objJobClass, time);
      }
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
  }

  /**
   * 移除一个任务(使用默认的任务组名，触发器名，触发器组名)
   * @param triggerKey
   * @param jobKey
   */
  public static void removeJob(TriggerKey triggerKey,JobKey jobKey) {
    try {
      Scheduler sched = schedulerFactory.getScheduler();
      sched.pauseTrigger(triggerKey);// 停止触发器
      sched.unscheduleJob(triggerKey);// 移除触发器
      sched.deleteJob(jobKey) ;
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
  }

  /**
   * 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);
    }
  }

  /**
   * 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);
    }
  }
}

测试

/**
 * 测试类
 * 
 * @author 那是一条神奇的天路
 *
 */
public class QuartzTest {
  public static void main(String[] args) {
    try {
      String job_name = "动态任务调度";
      System.out.println("【系统启动】开始(每1秒输出一次)...");  
      QuartzManager.addJob(job_name, QuartzJob.class, "0/1 * * * * ?");  
//      
      Thread.sleep(5000);  
      System.out.println("【修改时间】开始(每2秒输出一次)...");  
      QuartzManager.modifyJobTime(job_name, "10/3 * * * * ?");  
//      Thread.sleep(6000);  
      System.out.println("【移除定时】开始...");  
//      QuartzManager.removeJob(new TriggerKey(jobName, TRIGGER_GROUP_NAME),new JobKey(jobName, JOB_GROUP_NAME));  
//      System.out.println("【移除定时】成功");  
      QuartzManager.startJobs();
      Thread.sleep(6000);  
      QuartzManager.shutdownJobs();
//      System.out.println("【移除定时】成功");
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

pom

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>quartz</groupId>
  <artifactId>quartz</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  
  <dependencies>
 	 <dependency>
  	  <groupId>org.quartz-scheduler</groupId>
  	  <artifactId>quartz</artifactId>
   	 <version>2.2.2</version>
	</dependency>
	<dependency>
   	 <groupId>org.quartz-scheduler</groupId>
   	 <artifactId>quartz-jobs</artifactId>
   	 <version>2.2.2</version>
	</dependency>
	</dependencies>
</project>