Java实现---动态修改定时任务的执行时间

原创

道祖且长 2022-10-03 11:54:20 博主文章分类：spring ©著作权

文章标签 java spring boot spring 定时任务 文章分类 运维

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实现的效果

通过接口调用，在不重启服务的前提下，动态修改定时任务的执行时间

如何实现

1、只需要两个依赖，也就是Spring boot项目最基本的依赖

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.7.0</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.20</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>

2、启动类代码

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;

/**
 * @author yuanchangliang
 * @date 2022/9/30
 */
@EnableScheduling
@SpringBootApplication
public class DemoApplication {
 
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
        System.out.println("\n\n\n ★★★★ 动态修改定时任务 启动成功 ★★★★\n\n\n");
    }
}

3、定时任务代码

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 yuanchangliang
 * @date 2022/9/30
 */
@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(this::doCorn, 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);
            return cronTrigger.nextExecutionTime(triggerContext);
        });
    }

    public void doCorn(){
        log.info("Current time： {}", LocalDateTime.now());
    }
}

4、corn表达式所在的配置文件：task-config.ini

printTime.cron=0/10 * * * * ?

5、用于动态修改定时任务执行时间的接口：TestController.java

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 yuanchangliang
 * @date 2022/9/30
 */
@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";
    }
}