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SpringBoot设置动态定时任务

wl_Honest 人气:0

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。

经过网上搜索学习后,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>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
 
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-log4j2</artifactId>
            <optional>true</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>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>
 
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</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
 * @date 2022/3/22
 */
@EnableScheduling
@SpringBootApplication
public class 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.cron=0/10 * * * * ?

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
 * @date 2022/3/22
 */
@Data
@Slf4j
@Component
@PropertySource("classpath:/task-config.ini")
public class 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
 * @date 2022/3/22
 */
@Slf4j
@RestController
@RequestMapping("/test")
public class TestController {
 
    private final 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);
        return "ok";
    }
}

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
 * @date 2022/3/22
 */
@Data
@Slf4j
@Component
@PropertySource("classpath:/task-config.ini")
public class 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
 * @date 2022/3/22
 */
@Slf4j
@RestController
@RequestMapping("/test")
public class TestController {
 
    private final 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);
        return "ok";
    }
 
    @GetMapping("/updateTimer")
    public String updateTimer(Long timer) {
        log.info("new timer :{}", timer);
        scheduleTask.setTimer(timer);
        return "ok";
    }
}

测试结果:

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