code: public static boolean checkExists(String jobName) {
          LOG.info("查看任务" + jobName);
          try {
              if (scheduler != null && !scheduler.isShutdown()) {
                  JobKey jobKey = JobKey.jobKey(jobName, SchedulingMetaInfoBuilder.DEFAULT_JOB_GROUP);
                  return scheduler.checkExists(jobKey);
              } else {
                  LOG.info("整个定时器都没在跑");
                  return false;
              }
          } catch (SchedulerException e) {
              LOG.error("查看任务[" + jobName + "]失败", e);
          }
          return false;
      }
docs: suwy增加 判断指定定时器状态