我以为动态停启定时任务一般用quartz，没想到还可以通过ScheduledTaskRegistrar来拓展。但是分布式场景，建议还是用quartz吧！
在 spring boot 项目中，可以通过 @EnableScheduling 注解和 @Scheduled 注解实现定时任务，也可以通过 SchedulingConfigurer 接口来实现定时任务。但是这两种方式不能动态添加、删除、启动、停止任务。要实现动态增删启停定时任务功能，比较广泛的做法是集成 Quartz 框架。
但是本人的开发原则是：在满足项目需求的情况下，尽量少的依赖其它框架，避免项目过于臃肿和复杂。查看 spring-context 这个 jar 包中 org.springframework.scheduling.ScheduledTaskRegistrar 这个类的源代码，发现可以通过改造这个类就能实现动态增删启停定时任务功能。
定时任务列表页
定时任务执行日志
添加执行定时任务的线程池配置类
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@Configurationpublic class SchedulingConfig { @Bean public TaskScheduler taskScheduler() { ThreadPoolTaskScheduler taskScheduler = new ThreadPoolTaskScheduler(); taskScheduler.setPoolSize(4); taskScheduler.setRemoveOnCancelPolicy(true); taskScheduler.setThreadNamePrefix("TaskSchedulerThreadPool-"); return taskScheduler; }} |
添加 ScheduledFuture 的包装类。ScheduledFuture 是 ScheduledExecutorService 定时任务线程池的执行结果。
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public final class ScheduledTask { volatile ScheduledFuture<?> future; public void cancel() { ScheduledFuture<?> future = this.future; if (future != null) { future.cancel(true); } }} |
添加 Runnable 接口实现类，被定时任务线程池调用，用来执行指定 bean 里面的方法。
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public class SchedulingRunnable implements Runnable { private static final Logger logger = LoggerFactory.getLogger(SchedulingRunnable.class); private String beanName; private String methodName; private String params; public SchedulingRunnable(String beanName, String methodName) { this(beanName, methodName, null); } public SchedulingRunnable(String beanName, String methodName, String params) { this.beanName = beanName; this.methodName = methodName; this.params = params; } @Override public void run() { logger.info("定时任务开始执行 - bean：{}，方法：{}，参数：{}", beanName, methodName, params); long startTime = System.currentTimeMillis(); try { Object target = SpringContextUtils.getBean(beanName); Method method = null; if (StringUtils.isNotEmpty(params)) { method = target.getClass().getDeclaredMethod(methodName, String.class); } else { method = target.getClass().getDeclaredMethod(methodName); } ReflectionUtils.makeAccessible(method); if (StringUtils.isNotEmpty(params)) { method.invoke(target, params); } else { method.invoke(target); } } catch (Exception ex) { logger.error(String.format("定时任务执行异常 - bean：%s，方法：%s，参数：%s ", beanName, methodName, params), ex); } long times = System.currentTimeMillis() - startTime; logger.info("定时任务执行结束 - bean：{}，方法：{}，参数：{}，耗时：{} 毫秒", beanName, methodName, params, times); } @Override public boolean equals(Object o) { if (this == o) return true; if (o == null || getClass() != o.getClass()) return false; SchedulingRunnable that = (SchedulingRunnable) o; if (params == null) { return beanName.equals(that.beanName) && methodName.equals(that.methodName) && that.params == null; } return beanName.equals(that.beanName) && methodName.equals(that.methodName) && params.equals(that.params); } @Override public int hashCode() { if (params == null) { return Objects.hash(beanName, methodName); } return Objects.hash(beanName, methodName, params); }} |
添加定时任务注册类，用来增加、删除定时任务。
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@Componentpublic class CronTaskRegistrar implements DisposableBean { private final Map<Runnable, ScheduledTask> scheduledTasks = new ConcurrentHashMap<>(16); @Autowired private TaskScheduler taskScheduler; public TaskScheduler getScheduler() { return this.taskScheduler; } public void addCronTask(Runnable task, String cronExpression) { addCronTask(new CronTask(task, cronExpression)); } public void addCronTask(CronTask cronTask) { if (cronTask != null) { Runnable task = cronTask.getRunnable(); if (this.scheduledTasks.containsKey(task)) { removeCronTask(task); } this.scheduledTasks.put(task, scheduleCronTask(cronTask)); } } public void removeCronTask(Runnable task) { ScheduledTask scheduledTask = this.scheduledTasks.remove(task); if (scheduledTask != null) scheduledTask.cancel(); } public ScheduledTask scheduleCronTask(CronTask cronTask) { ScheduledTask scheduledTask = new ScheduledTask(); scheduledTask.future = this.taskScheduler.schedule(cronTask.getRunnable(), cronTask.getTrigger()); return scheduledTask; } @Override public void destroy() { for (ScheduledTask task : this.scheduledTasks.values()) { task.cancel(); } this.scheduledTasks.clear(); }} |
添加定时任务示例类
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@Component("demoTask")public class DemoTask { public void taskWithParams(String params) { System.out.println("执行有参示例任务：" + params); } public void taskNoParams() { System.out.println("执行无参示例任务"); }} |
定时任务数据库表设计
定时任务数据库表设计
添加定时任务实体类
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public class SysJobPO { private Integer jobId; private String beanName; private String methodName; private String methodParams; private String cronExpression; private Integer jobStatus; private String remark; private Date createTime; private Date updateTime; public Integer getJobId() { return jobId; } public void setJobId(Integer jobId) { this.jobId = jobId; } public String getBeanName() { return beanName; } public void setBeanName(String beanName) { this.beanName = beanName; } public String getMethodName() { return methodName; } public void setMethodName(String methodName) { this.methodName = methodName; } public String getMethodParams() { return methodParams; } public void setMethodParams(String methodParams) { this.methodParams = methodParams; } public String getCronExpression() { return cronExpression; } public void setCronExpression(String cronExpression) { this.cronExpression = cronExpression; } public Integer getJobStatus() { return jobStatus; } public void setJobStatus(Integer jobStatus) { this.jobStatus = jobStatus; } public String getRemark() { return remark; } public void setRemark(String remark) { this.remark = remark; } public Date getCreateTime() { return createTime; } public void setCreateTime(Date createTime) { this.createTime = createTime; } public Date getUpdateTime() { return updateTime; } public void setUpdateTime(Date updateTime) { this.updateTime = updateTime; }} |
新增定时任务
新增定时任务
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boolean success = sysJobRepository.addSysJob(sysJob);if (!success) return OperationResUtils.fail("新增失败");else { if (sysJob.getJobStatus().equals(SysJobStatus.NORMAL.ordinal())) { SchedulingRunnable task = new SchedulingRunnable(sysJob.getBeanName(), sysJob.getMethodName(), sysJob.getMethodParams()); cronTaskRegistrar.addCronTask(task, sysJob.getCronExpression()); }}return OperationResUtils.success(); |
修改定时任务，先移除原来的任务，再启动新任务
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boolean success = sysJobRepository.editSysJob(sysJob);if (!success) return OperationResUtils.fail("编辑失败");else { if (existedSysJob.getJobStatus().equals(SysJobStatus.NORMAL.ordinal())) { SchedulingRunnable task = new SchedulingRunnable(existedSysJob.getBeanName(), existedSysJob.getMethodName(), existedSysJob.getMethodParams()); cronTaskRegistrar.removeCronTask(task); } if (sysJob.getJobStatus().equals(SysJobStatus.NORMAL.ordinal())) { SchedulingRunnable task = new SchedulingRunnable(sysJob.getBeanName(), sysJob.getMethodName(), sysJob.getMethodParams()); cronTaskRegistrar.addCronTask(task, sysJob.getCronExpression()); }}return OperationResUtils.success(); |
删除定时任务
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boolean success = sysJobRepository.deleteSysJobById(req.getJobId());if (!success) return OperationResUtils.fail("删除失败");else{ if (existedSysJob.getJobStatus().equals(SysJobStatus.NORMAL.ordinal())) { SchedulingRunnable task = new SchedulingRunnable(existedSysJob.getBeanName(), existedSysJob.getMethodName(), existedSysJob.getMethodParams()); cronTaskRegistrar.removeCronTask(task); }}return OperationResUtils.success(); |
定时任务启动 / 停止状态切换
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if (existedSysJob.getJobStatus().equals(SysJobStatus.NORMAL.ordinal())) { SchedulingRunnable task = new SchedulingRunnable(existedSysJob.getBeanName(), existedSysJob.getMethodName(), existedSysJob.getMethodParams()); cronTaskRegistrar.addCronTask(task, existedSysJob.getCronExpression());} else { SchedulingRunnable task = new SchedulingRunnable(existedSysJob.getBeanName(), existedSysJob.getMethodName(), existedSysJob.getMethodParams()); cronTaskRegistrar.removeCronTask(task);} |
添加实现了 CommandLineRunner 接口的 SysJobRunner 类，当 spring boot 项目启动完成后，加载数据库里状态为正常的定时任务。
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@Servicepublic class SysJobRunner implements CommandLineRunner { private static final Logger logger = LoggerFactory.getLogger(SysJobRunner.class); @Autowired private ISysJobRepository sysJobRepository; @Autowired private CronTaskRegistrar cronTaskRegistrar; @Override public void run(String... args) { List<SysJobPO> jobList = sysJobRepository.getSysJobListByStatus(SysJobStatus.NORMAL.ordinal()); if (CollectionUtils.isNotEmpty(jobList)) { for (SysJobPO job : jobList) { SchedulingRunnable task = new SchedulingRunnable(job.getBeanName(), job.getMethodName(), job.getMethodParams()); cronTaskRegistrar.addCronTask(task, job.getCronExpression()); } logger.info("定时任务已加载完毕..."); } }} |
工具类 SpringContextUtils，用来从 spring 容器里获取 bean
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@Componentpublic class SpringContextUtils implements ApplicationContextAware { private static ApplicationContext applicationContext; @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { SpringContextUtils.applicationContext = applicationContext; } public static Object getBean(String name) { return applicationContext.getBean(name); } public static <T> T getBean(Class<T> requiredType) { return applicationContext.getBean(requiredType); } public static <T> T getBean(String name, Class<T> requiredType) { return applicationContext.getBean(name, requiredType); } public static boolean containsBean(String name) { return applicationContext.containsBean(name); } public static boolean isSingleton(String name) { return applicationContext.isSingleton(name); } public static Class<? extends Object> getType(String name) { return applicationContext.getType(name); }} |
总结
到此这篇关于Spring Boot如何实现定时任务的动态增删启停的文章就介绍到这了,更多相关SpringBoot定时任务的动态增删启停内容请搜索服务器之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持服务器之家！
原文链接：https://www.geek521.com/2020/07/18/springboot实现定时任务的动态增删启停/
