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java spring boot 动态添加 cron（表达式）任务、动态添加停止单个cron任务

1. 添加对应的maven

       <dependency><groupId>org.quartz-scheduler</groupId><artifactId>quartz</artifactId><version>2.3.0</version></dependency>

2.  添加一个工具类  SchedulerManager 

   import org.quartz.Scheduler;
   import org.quartz.SchedulerException;
   import org.quartz.SchedulerFactory;
   import org.quartz.impl.StdSchedulerFactory;public class SchedulerManager {private static Scheduler scheduler;// 初始化 Scheduler public static void initScheduler() throws SchedulerException {SchedulerFactory schedulerFactory = new StdSchedulerFactory();scheduler = schedulerFactory.getScheduler();// 为了方便直接创建后启用scheduler.start();}// 使用同步块确保线程安全public static Scheduler getScheduler() {if (scheduler == null) {synchronized (SchedulerManager.class) {if (scheduler == null) {  // 双重检查try {initScheduler();} catch (SchedulerException e) {// 处理异常或抛出自定义异常e.printStackTrace();}}}}return scheduler;}// 启动 scheduler public static void start() {try {if (!scheduler.isStarted()) {scheduler.start();}} catch (SchedulerException e) {// 处理异常或抛出自定义异常e.printStackTrace();}}// 暂停任务/删除任务public static void stopTask(String jobKey) {try {Scheduler scheduler = SchedulerManager.getScheduler();JobKey key = new JobKey(jobKey, jobKey);JobDetail jobDetail = scheduler.getJobDetail(key);if (jobDetail != null) {// 获取JobDataMapJobDataMap dataMap = jobDetail.getJobDataMap();dataMap.put("ok", false);// 暂停任务scheduler.pauseJob(key);// 或者删除当前任务// scheduler.deleteJob(key);}} catch (SchedulerException e) {e.printStackTrace();}}// 恢复任务public static int startTask(String jobKey) {int o = 0;try {Scheduler scheduler = SchedulerManager.getScheduler();JobKey key = new JobKey(jobKey, jobKey);JobDetail jobDetail = scheduler.getJobDetail(key);if (jobDetail != null) {// 获取JobDataMapJobDataMap dataMap = jobDetail.getJobDataMap();dataMap.put("ok", true);// 恢复任务scheduler.resumeJob(key);o = 1;}} catch (SchedulerException e) {e.printStackTrace();}finally {return o;}}/*** 停止所有任务*/public static void stopAllTask() {try {Scheduler scheduler = context.getScheduler();try {// 停止调度器scheduler.shutdown();} catch (SchedulerException e) {logger.error("停止调度器时出错", e);throw new JobExecutionException("停止调度器时出错", e);}} catch (SchedulerException e) {e.printStackTrace();}}}

3. 添加cron执行任务类

   import lombok.extern.slf4j.Slf4j;
   import org.quartz.*;
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   import org.springframework.stereotype.Component;
   import org.springframework.stereotype.Service;import java.text.SimpleDateFormat;
   import java.util.Date;@Component
   @Slf4j
   @Service
   public class CronThread implements Job {private final static Logger logger = LoggerFactory.getLogger(MediaServerServiceImpl.class);// 详情idString detailId = "";// 启用/停用（双重保险）boolean ok = true;// 设备idint facilityId = -1;public void setOK(boolean ok) {this.ok = ok;}@Overridepublic void execute(JobExecutionContext context) throws JobExecutionException {try {JobDataMap dataMap = context.getJobDetail().getJobDataMap();// 获取参数，注意数据类型this.ok = dataMap.getBoolean("ok");if (ok){this.detailId = dataMap.getString("detailId");this.facilityId = dataMap.getInt("facilityId");logger.info("任务执行: " + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()) + "。key=" + context.getJobDetail().getKey());frameSave();}} catch (Exception e) {logger.error("执行任务异常，内容", e);logger.info("停止任务：{}",context.getJobDetail().getKey());Scheduler scheduler = context.getScheduler();try {// 暂停当前任务
   //                scheduler.pauseJob(context.getJobDetail().getKey());// 或者删除当前任务scheduler.deleteJob(context.getJobDetail().getKey());} catch (SchedulerException s) {logger.error("暂停或删除任务时出错", s);throw new JobExecutionException("暂停或删除任务时出错", s);}}}public void frameSave() {try {logger.info("执行任务");} catch (Exception e) {logger.error("执行异常，内容： ", e);}}
   }
   

4. 启动/使用 方式

       // 启动全部public void startAllTasks(List<Map<String,Object>> mapList){// 获取schedulerScheduler scheduler = SchedulerManager.getScheduler();for (Map<String, Object> map : mapList) {try {// 像任务执行类传入参数JobDataMap jobDataMap = new JobDataMap();jobDataMap.put("detailId", map.get("detailId").toString());jobDataMap.put("facilityId", (int) map.get("detailId"));jobDataMap.put("ok", true);// 任务唯一标识 根据情况来定，后续停止或启用单个的时候需要用到该key值String key = map.get("detailId").toString() + "-" + map.get("facilityId").toString();//    上面创建的  cron 执行任务类（CronThread.class）JobDetail jobDetail = JobBuilder.newJob(CronThread.class).withIdentity(key, key).setJobData(jobDataMap).build();Trigger trigger = TriggerBuilder.newTrigger().withIdentity(key, key).withSchedule(CronScheduleBuilder.cronSchedule(map.get("cronStr").toString()))//cron表达式.build();// 添加任务 到时间后会自动调用(在上面获取scheduler时里面有启动的操作)scheduler.scheduleJob(jobDetail, trigger);} catch (Exception e){e.printStackTrace();logger.error("启动抽帧任务报错：: ", e);}}}// 停止单个任务public void stopOneTask(String detailId,int facilityId){// 任务唯一标识String key = detailId + "-" + facilityId;SchedulerManager.stopTask(key);}// 启动单个任务public int startOneTask(String detailId,int facilityId,String cronStr){// 任务唯一标识String key = detailId + "-" + facilityId;int i = SchedulerManager.startTask(detailId + "-" + facilityId);if (i == 0) {// 该任务已被删除 重新添加try {// 可以将下面代码封装成一个方法，否则会和上面启动全部任务的操作代码重复JobKey jobKey = new JobKey(key, key);Scheduler scheduler = SchedulerManager.getScheduler();if (scheduler.checkExists(jobKey)) {return 1;}JobDataMap jobDataMap = new JobDataMap();jobDataMap.put("detailId", detailId);jobDataMap.put("facilityId", facilityId);jobDataMap.put("ok", true);JobDetail jobDetail = JobBuilder.newJob(CronThread.class).withIdentity(key, key).setJobData(jobDataMap).build();Trigger trigger = TriggerBuilder.newTrigger().withIdentity(key, key).withSchedule(CronScheduleBuilder.cronSchedule(cronStr)).build();scheduler.scheduleJob(jobDetail, trigger);return 1;} catch (SchedulerException e) {// 处理调度器异常e.printStackTrace();logger.error("One Scheduler exception: ", e);return 0;}}return 0;}