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在浴室里做的网站,网页游戏开服表265,禄劝网络推广外包,建筑工程网教之前写过文章记录怎么在SpringBoot项目中简单使用定时任务#xff0c;不过由于要借助cron表达式且都提前定义好放在配置文件里#xff0c;不能在项目运行中动态修改任务执行时间#xff0c;实在不太灵活。 经过一番研究之后#xff0c;特此记录如何在SpringBoot项目中实现…之前写过文章记录怎么在SpringBoot项目中简单使用定时任务不过由于要借助cron表达式且都提前定义好放在配置文件里不能在项目运行中动态修改任务执行时间实在不太灵活。经过一番研究之后特此记录如何在SpringBoot项目中实现动态定时任务。因为只是一个demo所以只引入了需要的依赖dependencies dependency groupIdorg.springframework.boot/groupId artifactIdspring-boot-starter-web/artifactId /dependency dependency groupIdorg.springframework.boot/groupId artifactIdspring-boot-starter-log4j2/artifactId optionaltrue/optional /dependency !-- spring boot 2.3版本后如果需要使用校验需手动导入validation包-- dependency groupIdorg.springframework.boot/groupId artifactIdspring-boot-starter-validation/artifactId /dependency dependency groupIdorg.projectlombok/groupId artifactIdlombok/artifactId optionaltrue/optional /dependency /dependencies启动类package com.wl.demo; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.scheduling.annotation.EnableScheduling; /** * author wl */ EnableScheduling SpringBootApplication publicclass DemoApplication { public static void main(String[] args) { SpringApplication.run(DemoApplication.class, args); System.out.println((*^▽^*)启动成功!!!(〃▽〃)); } }配置文件application.yml只定义了服务端口server: port: 8089定时任务执行时间配置文件task-config.ini:printTime.cron0/10 * * * * ?定时任务执行类package com.wl.demo.task; import lombok.Data; import lombok.extern.slf4j.Slf4j; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.PropertySource; import org.springframework.scheduling.Trigger; import org.springframework.scheduling.TriggerContext; import org.springframework.scheduling.annotation.SchedulingConfigurer; import org.springframework.scheduling.config.ScheduledTaskRegistrar; import org.springframework.scheduling.support.CronTrigger; import org.springframework.stereotype.Component; import java.time.LocalDateTime; import java.util.Date; /** * 定时任务 * author wl */ Data Slf4j Component PropertySource(classpath:/task-config.ini) publicclass ScheduleTask implements SchedulingConfigurer { Value(${printTime.cron}) private String cron; Override public void configureTasks(ScheduledTaskRegistrar taskRegistrar) { // 动态使用cron表达式设置循环间隔 taskRegistrar.addTriggerTask(new Runnable() { Override public void run() { log.info(Current time {}, LocalDateTime.now()); } }, new Trigger() { Override public Date nextExecutionTime(TriggerContext triggerContext) { // 使用CronTrigger触发器可动态修改cron表达式来操作循环规则 CronTrigger cronTrigger new CronTrigger(cron); Date nextExecutionTime cronTrigger.nextExecutionTime(triggerContext); return nextExecutionTime; } }); } }编写一个接口使得可以通过调用接口动态修改该定时任务的执行时间package com.wl.demo.controller; import com.wl.demo.task.ScheduleTask; import lombok.extern.slf4j.Slf4j; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; /** * author wl */ Slf4j RestController RequestMapping(/test) publicclass TestController { privatefinal ScheduleTask scheduleTask; Autowired public TestController(ScheduleTask scheduleTask) { this.scheduleTask scheduleTask; } GetMapping(/updateCron) public String updateCron(String cron) { log.info(new cron :{}, cron); scheduleTask.setCron(cron); returnok; } }启动项目可以看到任务每10秒执行一次访问接口传入请求参数cron表达式将定时任务修改为15秒执行一次可以看到任务变成了15秒执行一次除了上面的借助cron表达式的方法还有另一种触发器区别于CronTrigger触发器该触发器可随意设置循环间隔时间不像cron表达式只能定义小于等于间隔59秒。package com.wl.demo.task; import lombok.Data; import lombok.extern.slf4j.Slf4j; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.PropertySource; import org.springframework.scheduling.Trigger; import org.springframework.scheduling.TriggerContext; import org.springframework.scheduling.annotation.SchedulingConfigurer; import org.springframework.scheduling.config.ScheduledTaskRegistrar; import org.springframework.scheduling.support.CronTrigger; import org.springframework.scheduling.support.PeriodicTrigger; import org.springframework.stereotype.Component; import java.time.LocalDateTime; import java.util.Date; /** * 定时任务 * author wl */ Data Slf4j Component PropertySource(classpath:/task-config.ini) publicclass ScheduleTask implements SchedulingConfigurer { Value(${printTime.cron}) private String cron; private Long timer 10000L; Override public void configureTasks(ScheduledTaskRegistrar taskRegistrar) { // 动态使用cron表达式设置循环间隔 taskRegistrar.addTriggerTask(new Runnable() { Override public void run() { log.info(Current time {}, LocalDateTime.now()); } }, new Trigger() { Override public Date nextExecutionTime(TriggerContext triggerContext) { // 使用CronTrigger触发器可动态修改cron表达式来操作循环规则 // CronTrigger cronTrigger new CronTrigger(cron); // Date nextExecutionTime cronTrigger.nextExecutionTime(triggerContext); // 使用不同的触发器为设置循环时间的关键区别于CronTrigger触发器该触发器可随意设置循环间隔时间单位为毫秒 PeriodicTrigger periodicTrigger new PeriodicTrigger(timer); Date nextExecutionTime periodicTrigger.nextExecutionTime(triggerContext); return nextExecutionTime; } }); } }增加一个修改时间的接口package com.wl.demo.controller; import com.wl.demo.task.ScheduleTask; import lombok.extern.slf4j.Slf4j; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; /** * author wl */ Slf4j RestController RequestMapping(/test) publicclass TestController { privatefinal ScheduleTask scheduleTask; Autowired public TestController(ScheduleTask scheduleTask) { this.scheduleTask scheduleTask; } GetMapping(/updateCron) public String updateCron(String cron) { log.info(new cron :{}, cron); scheduleTask.setCron(cron); returnok; } GetMapping(/updateTimer) public String updateTimer(Long timer) { log.info(new timer :{}, timer); scheduleTask.setTimer(timer); returnok; } }测试结果