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基于quartz，刷新定时器的cron表达式

1. 先看一下测试效果

因为这个我是基于quartz里面部分功能做的自定义分布式定时器框架，因此，关于定时器的实现可以略过，下面是我这个测试任务定时器的定义，看看就好。

    @Bean(name = "testFourTaskDetail")public JobDetail testFourTaskDetail(MyTask myTask) throws ClassNotFoundException, NoSuchMethodException {MethodInvokingJobDetailFactoryBean jobDetailFactoryBean = new MethodInvokingJobDetailFactoryBean();jobDetailFactoryBean.setConcurrent(Boolean.TRUE);jobDetailFactoryBean.setName("testFourTask");jobDetailFactoryBean.setTargetObject(myTask);jobDetailFactoryBean.setTargetMethod("testFourTask");jobDetailFactoryBean.afterPropertiesSet();return jobDetailFactoryBean.getObject();}//定时触发器@Bean(name = "testFourTaskTrigger")public CronTriggerFactoryBean testFourTaskTrigger(@Qualifier("testFourTaskDetail") JobDetail testTwoTaskDetail){CronTriggerFactoryBean cronTriggerFactoryBean = new CronTriggerFactoryBean();cronTriggerFactoryBean.setJobDetail(testTwoTaskDetail);//初始的Cron表达式//cronTriggerFactoryBean.setCronExpression("0 0/15 * * * ?");cronTriggerFactoryBean.setCronExpression("* * * * * ?");return cronTriggerFactoryBean;}//Quartz 调度工厂@Bean("scheduler")public SchedulerFactoryBean schedulerFactoryBean(@Qualifier("testFourTaskTrigger") Trigger testFourTaskTrigger){SchedulerFactoryBean schedulerFactoryBean = new SchedulerFactoryBean();schedulerFactoryBean.setOverwriteExistingJobs(true); // 如果存在重复的任务，会覆盖//  延迟启动 1sschedulerFactoryBean.setStartupDelay(1);// 配置线程池Properties quartzProperties = new Properties();quartzProperties.setProperty("org.quartz.threadPool.class", "org.quartz.simpl.SimpleThreadPool");// 设置线程池大小为10 threadCount 决定了最多可以并行执行多少个任务，多个任务可以同时运行，互不阻塞。quartzProperties.setProperty("org.quartz.threadPool.threadCount", "10");quartzProperties.setProperty("org.quartz.threadPool.threadPriority", "5"); //线程优先级schedulerFactoryBean.setQuartzProperties(quartzProperties);//注册触发器schedulerFactoryBean.setTriggers(testFourTaskTrigger);return schedulerFactoryBean;}

下面是任务:

    @SchedulerTaskLock(name = SchedulerTaskEnum.TEST_FOUR_TASK,lockAtMostForString = 1000 * 6 * 5,lockMostTimeForString = 1000 * 60 * 5,saveLock = true,saveType = SchedulerTask.ALL,lockStatus = true)public void testFourTask() throws InterruptedException {Thread.sleep(11000);int[] numbers = {1, 2, 3};System.out.println(numbers[3]);log.info("============= testFourTask============");SchedulerTaskUtils.updateChannelTag(TagEnum.ERROR_TAG,"testFourTask执行逻辑时出现错误");SchedulerTaskUtils.updateChannelTag(TagEnum.SUCCESS_TAG);}

下面是pom:

        <dependency><groupId>org.quartz-scheduler</groupId><artifactId>quartz</artifactId><version>2.3.2</version></dependency><!-- Quartz Scheduler --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-quartz</artifactId></dependency>

我这个任务是每秒执行一次，我这个任务是测试的下标越界异常捕获否示例，所有报错是很正常的，如下:

下面是执行刷新cron表达式的效果:
triggerKey是你的触发器的bean name，cronExpression是你要更新的cron表达式。

看下图，可以看到刷新成功了。

然后我们看它的执行频率:

明显不是每秒执行一次了。

2. 实现代码

下面是代码:
工具类:

package org.example.quartz;import lombok.extern.slf4j.Slf4j;
import org.quartz.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableScheduling;import javax.annotation.Resource;/**
* @description: TODO
* @author 杨镇宇
* @date 2024/7/31 14:05
* @version 1.0
*/
@Configuration
@EnableScheduling
@Slf4j
public class SchedulerRefresh {// 静态成员变量，存储Scheduler对象private static Scheduler scheduler;// 使用ApplicationContext注入Scheduler@Autowiredpublic void setScheduler(Scheduler scheduler) {SchedulerRefresh.scheduler = scheduler;  // 将注入的Scheduler赋值给静态成员变量}public static boolean refresh(String triggerKey, String cronExpression) throws SchedulerException {// 获取当前的 TriggerTriggerKey key = TriggerKey.triggerKey(triggerKey);CronTrigger oldTrigger = (CronTrigger) scheduler.getTrigger(key);if (null != oldTrigger) {// 如果存在，创建一个新的 CronTriggerCronScheduleBuilder cronScheduleBuilder = CronScheduleBuilder.cronSchedule(cronExpression);CronTrigger newTrigger = oldTrigger.getTriggerBuilder().withSchedule(cronScheduleBuilder).build();// 重新调度任务scheduler.rescheduleJob(key, newTrigger);log.info("已刷新Cron表达式，新的表达式为: {}", cronExpression);return Boolean.TRUE;} else {log.warn("未找到指定的 Trigger: {}", triggerKey);return Boolean.FALSE;}}}

controller:

    @ApiOperation(value = "刷新cron表达式", notes = "刷新cron表达式")@CommonLog(methodName = "刷新cron表达式",className = "TSchedulerLockController#schedulerRefresh")@RequestMapping(value = "/schedulerRefresh", method = RequestMethod.POST)public ResponseResult schedulerRefresh(@Validated @RequestBody SchedulerRefreshVo searchParam){boolean refreshRes;try {refreshRes = SchedulerRefresh.refresh(searchParam.getTriggerKey(),searchParam.getCronExpression());}catch (SchedulerException sc){log.error("定时器刷新cron失败",sc);throw  new RunException(ExceptionEnum.ERROR_MSG,"定时器刷新cron失败");}return ResponseResult.ok(refreshRes);}

vo:

package org.example.vo;import io.swagger.annotations.ApiModelProperty;
import lombok.*;
import org.hibernate.validator.constraints.NotEmpty;/**
* @author 杨镇宇
* @date 2025/1/21 9:25
* @version 1.0
*/
@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
@EqualsAndHashCode(callSuper = false)
public class SchedulerRefreshVo {@ApiModelProperty("triggerKey")@NotEmpty(message ="triggerKey不能为空")private String triggerKey;@ApiModelProperty("cronExpression")@NotEmpty(message ="cronExpression不能为空")private String cronExpression;
}