動態添加、修改、刪除定時任務

近日在做項目的時候，要在前台配置定時任務才發現可以動態的添加、修改和刪除定時任務，現在用一個簡單的例子做下記錄。

首先，添加一個定時任務管理類QuartzManager：

package com.breeze.job;

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

public class QuartzManager {

    private Scheduler scheduler;

    private static QuartzManager instance = null;

    private QuartzManager() {
        try {
            scheduler = new StdSchedulerFactory().getScheduler();
        } catch (SchedulerException e) {
            e.printStackTrace();
        }
    }

    /**
     * 獲取定時器調度實例
     * 
     * @return 實例對象
     */
    public static QuartzManager getInstance() {
        if (null == instance) {
            synchronized (QuartzManager.class) {
                if (null == instance) {
                    instance = new QuartzManager();
                }
            }
        }
        return instance;
    }

    /**
     * 功能： 添加一個定時任務
     * 
     * @param jobName
     *            任務名
     * @param jobGroupName
     *            任務組名
     * @param triggerName
     *            觸發器名
     * @param triggerGroupName
     *            觸發器組名
     * @param jobClass
     *            任務的類類型 eg:TimedMassJob.class
     * @param cron
     *            時間設置 表達式，參考quartz說明文檔
     */
    public void addJob(String jobName, String jobGroupName, String triggerName,
            String triggerGroupName, Class<? extends Job> jobClass, String cron,
            Object... objects) {
        try {
            // 任務名，任務組，任務執行類
            JobDetail jobDetail = JobBuilder.newJob(jobClass)
                    .withIdentity(jobName, jobGroupName).build();
            // 觸發器
            if (objects != null) {
                for (int i = 0; i < objects.length; i++) {
                    jobDetail.getJobDataMap().put("data" + (i + 1), objects[i]);
                }
            }
            TriggerBuilder<Trigger> triggerBuilder = TriggerBuilder
                    .newTrigger();
            // 觸發器名,觸發器組
            triggerBuilder.withIdentity(triggerName, triggerGroupName);
            triggerBuilder.startNow();
            // 觸發器時間設定
            triggerBuilder.withSchedule(CronScheduleBuilder.cronSchedule(cron));
            // 創建Trigger對象
            CronTrigger trigger = (CronTrigger) triggerBuilder.build();
            // 調度容器設置JobDetail和Trigger
            scheduler.scheduleJob(jobDetail, trigger);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * 功能：修改一個任務的觸發時間
     * 
     * @param jobName
     * @param jobGroupName
     * @param triggerName
     *            觸發器名
     * @param triggerGroupName
     *            觸發器組名
     * @param cron
     *            時間設置，參考quartz說明文檔
     */
    public void modifyJobTime(String jobName, String jobGroupName,
            String triggerName, String triggerGroupName, String cron) {
        try {
            TriggerKey triggerKey = TriggerKey.triggerKey(triggerName,
                    triggerGroupName);
            CronTrigger trigger = (CronTrigger) scheduler
                    .getTrigger(triggerKey);
            if (trigger == null) {
                return;
            }
            String oldTime = trigger.getCronExpression();
            if (!oldTime.equalsIgnoreCase(cron)) {
                // 觸發器
                TriggerBuilder<Trigger> triggerBuilder = TriggerBuilder
                        .newTrigger();
                // 觸發器名,觸發器組
                triggerBuilder.withIdentity(triggerName, triggerGroupName);
                triggerBuilder.startNow();
                // 觸發器時間設定
                triggerBuilder.withSchedule(CronScheduleBuilder
                        .cronSchedule(cron));
                // 創建Trigger對象
                trigger = (CronTrigger) triggerBuilder.build();
                // 方式一 ：修改一個任務的觸發時間
                scheduler.rescheduleJob(triggerKey, trigger);
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * 功能: 移除一個任務
     * 
     * @param jobName
     * @param jobGroupName
     * @param triggerName
     * @param triggerGroupName
     */
    public void removeJob(String jobName, String jobGroupName,
            String triggerName, String triggerGroupName) {
        try {
            TriggerKey triggerKey = TriggerKey.triggerKey(triggerName,
                    triggerGroupName);
            // 停止觸發器
            scheduler.pauseTrigger(triggerKey);
            // 移除觸發器
            scheduler.unscheduleJob(triggerKey);
            // 刪除任務
            scheduler.deleteJob(JobKey.jobKey(jobName, jobGroupName));
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * 
     * 功能：啟動所有定時任務
     */
    public void startJobs() {
        try {
            if (scheduler.isStarted()) {
                System.out.println("定時器已啟動。");
            } else {
                scheduler.start();
            }
        } catch (SchedulerException e1) {
            e1.printStackTrace();
        }
    }

    /**
     * 功能：關閉所有定時任務
     */
    public void shutdownJobs() {
        try {
            if (!scheduler.isShutdown()) {
                scheduler.shutdown();
            }
        } catch (SchedulerException e) {
            e.printStackTrace();
        }
    }
}

再添加兩個人物類

package com.breeze.job;

import java.util.Date;

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

public class A implements Job {

    @Override
    public void execute(JobExecutionContext arg0) throws JobExecutionException {
        JobDataMap jobDataMap = arg0.getJobDetail().getJobDataMap();
        String arg = (String) jobDataMap.get("data1");
        String arg1 = (String) jobDataMap.get("data2");
        System.out.println("Go job A..." + arg + "..."  + arg1 + "..." + new Date());
    }

}

package com.breeze.job;

import java.util.Date;

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

public class B implements Job {

    @Override
    public void execute(JobExecutionContext arg0) throws JobExecutionException {
        JobDataMap jobDataMap = arg0.getJobDetail().getJobDataMap();
        String arg = (String) jobDataMap.get("data1");
        System.out.println("Go job B..." + arg + "..." + new Date());
    }

}

對定時任務做添加修改、刪除、操作。

package foo;

import java.util.Date;

import com.breeze.job.A;
import com.breeze.job.B;
import com.breeze.job.QuartzManager;

public class App {
    public static void main(String[] args) {
        // 添加任務A
        QuartzManager.getInstance().addJob("A", "001", "A", "001", A.class,
                "0/5 * * * * ?", "A", "C");
        QuartzManager.getInstance().startJobs();
        try {
            Thread.sleep(20000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(new Date());
        // 修改任務A的出發時間設定
        QuartzManager.getInstance().modifyJobTime("A", "001", "A", "001", "0/4 * * * * ?");
        try {
            Thread.sleep(20000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(new Date());
        // 添加任務B
        QuartzManager.getInstance().addJob("B", "002", "B", "002", B.class,
                "0/6 * * * * ?", "B");
        try {
            Thread.sleep(20000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(new Date());
        // 刪除任務A
        QuartzManager.getInstance().removeJob("A", "001", "A", "001");
        try {
            Thread.sleep(20000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        QuartzManager.getInstance().shutdownJobs();
    }
}