Quartz 定时任务管理

前言

       将项目中的所有定时任务都统一管理吧，使用 quartz 定时任务

设计思路

1.  使用 quartz 的相关jar 包，懒得去升级了，我使用的是 quart 1.6
2.  写一个定时任务管理类
3.  用一张数据库表去统一定时任务
4.  项目启动的时候也启动定时任务管理，同时启动开启状态的定时任务
5. 制定页面去管理数据库的定时任务，如果，任务有修改删除停止等，修改对应修改定时任务
6. 项目停止时，停止定时任务

部分实现代码　

数据库脚本

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DROP TABLE IF EXISTS `sys_scheduler`;   CREATE TABLE `sys_scheduler` (   `id` int(11) NOT NULL AUTO_INCREMENT,   `cron` varchar(255) NOT NULL DEFAULT '',   `job_name` varchar(255) DEFAULT NULL,   `job_class` varchar(255) NOT NULL DEFAULT '',   `modify_time` datetime DEFAULT NULL,   `is_start` char(1) DEFAULT '0' COMMENT '任务状态是否启动，1-启动中，0-未启动',   PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8;   /*Data for the table `sys_scheduler` */   insert  into `sys_scheduler`(`id`,`cron`,`job_name`,`job_class`,`modify_time`,`is_start`) values (1,'0 30 * * * ?','示例定时任务','com.common.job.ExampleJob','2016-05-06 16:42:14','0');

定时任务管理（数据库的操作类省略）

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package com.common.utils;   import java.util.Iterator; import java.util.List;   import org.apache.log4j.Logger; import org.quartz.CronTrigger; import org.quartz.JobDataMap; import org.quartz.JobDetail; import org.quartz.Scheduler; import org.quartz.SchedulerException; import org.quartz.SchedulerFactory;   import com.common.dao.SysSchedulerDao; import com.common.model.SysScheduler;   /**  * 定时任务 管理类  * @author ppnie  *  */ public class SchedulerManager {     static SchedulerFactory schedFact = new org.quartz.impl.StdSchedulerFactory();     static Scheduler sched = null;     static SchedulerManager schedulerMgr = null;           private static final Logger logger = Logger.getLogger(SchedulerManager.class.getName());           /**      * 创建定时任务单例，并且初始化启动定时任务      * @return      */     public static SchedulerManager getInstance()     {         if (schedulerMgr == null)         {             schedulerMgr = new SchedulerManager();             schedulerMgr.init();         }         return schedulerMgr;     }           /**      * 初始化定时任务      */     public void init()     {         try         {             sched = schedFact.getScheduler();         }         catch (Exception e)         {             logger.error("init1:" + e.getMessage());         }             start();                   /*从数据库启动定时任务 */         SysSchedulerDao ssdao = new SysSchedulerDao();         List<SysScheduler> cdLists = ssdao.getSchedulerListByStart(ssdao.need_start);         Iterator<SysScheduler> ir = cdLists.iterator();         // System.out.println("-------------------Init Scheduler------------------");         while (ir.hasNext())         {             SysScheduler scheduler = ir.next();             scheduleJob(scheduler);         }               }           public void scheduleJob(SysScheduler scheduler)     {         scheduleJob(""+scheduler.getId(),scheduler.getJobClass(),scheduler.getCron());         if (isStarted())         {             System.out.println("Schedule " + scheduler.getJobName()+" class="+scheduler.getJobClass() + " cron=" + scheduler.getCron());         }     }           /**      * 添加某个任务到任务调度器      * @param jobId  任务id      * @param jobClass  任务job 类名      * @param cron 定时时间      * 设置定时器调度的时程表格式 秒 分 时 天 月 周 0 0 12 * * ? 每天中午十二点触发 0 15 10 15 * ? 每月15号的10：15触发 0 15 10 ? * 2-6      * 每个周一、周二、周三、周四、周五的10：15触发      */     public void scheduleJob(String jobId, String jobClass, String cron)     {         if (isStarted())         {             try             {                 Class cls = Class.forName(jobClass);                                   JobDetail jobDetail = new JobDetail(jobId, Scheduler.DEFAULT_GROUP, cls);                                   CronTrigger trigger = new CronTrigger(jobId, Scheduler.DEFAULT_GROUP, cron);                                   sched.scheduleJob(jobDetail, trigger);             }             catch (Exception e)             {                 System.out.println("scheduleJob这里报错"+jobClass);                 logger.error("scheduleJob:" + e.getMessage());             }         }     }           /**      *      * @param jobId      * @param jobClass      * @param cron      * @param data_map      */     public void scheduleJob(String jobId, String jobClass, String cron, String data_map)     {         if (isStarted())         {             System.out.println("Schedule " + jobClass + " cron=" + cron);             try             {                 Class cls = Class.forName(jobClass);                                   JobDetail jobDetail = new JobDetail(jobId, Scheduler.DEFAULT_GROUP, cls);                                   CronTrigger trigger = new CronTrigger(jobId, Scheduler.DEFAULT_GROUP, cron);                                   sched.scheduleJob(jobDetail, trigger);             }             catch (Exception e)             {                 logger.error("scheduleJob:" + e.getMessage());             }         }     }           /**      * 根据jobId 在 任务调度器 中删除某个任务      * @param jobId      */     public void delJob(String jobId)     {         try         {             sched.deleteJob(jobId, Scheduler.DEFAULT_GROUP);         }         catch (Exception e)         {             logger.error("deleteJob:" + e.getMessage());         }     }           /**      * 重新发布任务，在这里是根据jobId 修改任务执行时间 corn      * @param jobId      * @param cron      */     public void rescheduleJob(String jobId, String cron)     {         try         {                        JobDetail jd = sched.getJobDetail(jobId, Scheduler.DEFAULT_GROUP);             JobDataMap jdm = jd.getJobDataMap();             CronTrigger trigger = new CronTrigger("" + jobId, Scheduler.DEFAULT_GROUP, cron);             trigger.setJobName("" + jobId);             trigger.setJobGroup(Scheduler.DEFAULT_GROUP);             trigger.setJobDataMap(jdm);             sched.rescheduleJob(jobId, Scheduler.DEFAULT_GROUP, trigger);         }         catch (Exception e)         {             logger.error("rescheduleJob:" + e);         }     }           /**      * 启动 任务调度器      * 只有在Scheduler 有实例或standby 模式才能调用start() 方法      */     public void start()     {         try         {             sched.start();         }         catch (Exception e)         {             logger.error("start:" + e);         }     }           /**      * 关闭 任务调度器Scheduler      * 一旦调用shutdown() 方法之后就不能在调用start() 方法      */     public void shutdown()     {         System.out.println("------------------Shutdown Scheduler------------------");         try         {             sched.shutdown();         }         catch (Exception e)         {             logger.error("shutdown:" + e.getMessage());         }         schedulerMgr = null;     }           /**      * 判断 任务调度器Scheduler 是否被启动      * @return      */     public boolean isStarted()     {         boolean re = false;         try         {             re = sched.isStarted();         }         catch (Exception e)         {             logger.error("isStarted:" + e.getMessage());         }         return re;     }           /**      * 判断 任务调度器Scheduler 是否关闭      * @return      * @throws SchedulerException      */     public boolean isShutdown()     {         boolean re = false;          try         {             sched.isShutdown();         }         catch (SchedulerException e)         {             logger.error("isShutdown:" + e.getMessage());         }                   return re;     }           /**      * 设置 Scheduler 为 standby 模式      * standby 模式时 Scheduler 暂时停止查找 Job 去执行      */     public void standby() {         System.out.println("------------------Standby Scheduler------------------");         try {             sched.standby();         }         catch (Exception e) {             logger.error("standby:" + e.getMessage());         }     }       /**      * 判断Scheduler 操作是否是 standby 模式      */     public boolean isInStandbyMode() {         boolean re = false;         try {             re = sched.isInStandbyMode();         } catch (Exception e) {             logger.error("isInStandbyMode:" + e.getMessage());         }         return re;     }           /**      * 判断任务是否存在      * @param jobId      * @return      */     public boolean checkExists(String jobId)     {         boolean re = false;         try         {             CronTrigger trigger = (CronTrigger)sched.getTrigger("" + jobId, Scheduler.DEFAULT_GROUP);             return trigger != null;         }         catch (SchedulerException e)         {             logger.error("checkExists:" + e.getMessage());         }           return re;     }       }

　　

而随着项目的启停，可以建立一个servlet ，在init 方法中初始化 任务管理类，destory 方法中 关闭

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<servlet>   <servlet-name>SysSchedulerServlet</servlet-name>   <servlet-class>com.common.servlet.SysSchedulerServlet</servlet-class>   <load-on-startup>0</load-on-startup> </servlet>