我喜欢使用.ymlfile的不同配置属性来实现一个@Scheduled作业.

在我的yaml文件中,我将cron表达式描述为一个列表：

job:
  schedules:
  - 10 * * * * *
  - 20 * * * * *

我使用配置读取了这些值,并创建了一个名为Scheduled的@Bean：

@Configuration
@ConfigurationProperties(prefix="job", locations = "classpath:cronjob.yml")
public class CronConfig {

    private List<String> schedules;

    @Bean
    public List<String> schedules() {
        return this.schedules;
    }

    public List<String> getSchedules() {
        return schedules;
    }

    public void setSchedules(List<String> schedules) {
        this.schedules = schedules;
    }
}

在我的Job类中,我想开始执行一种方法,但是要执行配置中的两个计划.

 @Scheduled(cron = "#{@schedules}")
 public String execute() {
     System.out.println(converterService.test());
     return "success";
 }

使用此解决方案,应用程序将创建错误：(或多或少清晰)

Encountered invalid @Scheduled method 'execute': Cron expression must consist of 6 fields (found 12 in "[10 * * * * *, 20 * * * * *]")

是否可以使用多个cron表达式声明来配置相同的计划作业方法？

编辑1

经过一番尝试后,我只是在executer方法上使用了第二个注释.

@Scheduled(cron = "#{@schedules[0]}")
@Scheduled(cron = "#{@schedules[1]}")
public String execute() {
    System.out.println(converterService.test());
    return "success";
}

此解决方案有效,但并非真正动态.有没有办法使它动态？

解决方法:(编辑,因为我找到了一种执行此操作的方法)

您实际上可以做到这一点.下面我展示了一个工作示例：

cronjob.yaml

job:
  schedules:
  - 10 * * * * *
  - 20 * * * * *

执行MyTask的实际任务：

package hello;

import org.springframework.stereotype.Component;

@Component
public class MyTask implements Runnable {

    @Override
    public void run() {
        //complicated stuff
    }
}

您的CronConfig如下：

package hello;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.List;

    @Configuration
    @ConfigurationProperties(prefix="job", locations = "classpath:cronjob.yml")
    public class CronConfig {

        private List<String> schedules;

        @Bean
        public List<String> schedules() {
            return this.schedules;
        }

        public List<String> getSchedules() {
            return schedules;
        }

        public void setSchedules(List<String> schedules) {
            this.schedules = schedules;
        }
    }

ScheduledTask bean,负责调度所有的任务：

package hello;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.support.CronTrigger;
import org.springframework.stereotype.Component;

@Component
public class ScheduledTasks {

    @Autowired
    private TaskScheduler taskScheduler;

    @Autowired
    private CronConfig cronConfig;

    @Autowired
    private MyTask myTask;

    private static final Logger log = LoggerFactory.getLogger(ScheduledTasks.class);

    public void scheduleAllCrons() {

        cronConfig.getSchedules().forEach( cron -> taskScheduler.schedule(myTask, new CronTrigger(cron)) );
    }
}

上下文/主类应用程序：

package hello;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.concurrent.ConcurrentTaskScheduler;

@SpringBootApplication
@EnableScheduling
@EnableAsync
public class Application {

    @Bean
    public TaskScheduler taskScheduler() {
        return new ConcurrentTaskScheduler();
    }


    public static void main(String[] args) throws Exception {
        ApplicationContext ctx = SpringApplication.run(Application.class);

        ScheduledTasks scheduledTasks = ctx.getBean(ScheduledTasks.class);

        scheduledTasks.scheduleAllCrons();
    }
}

或者(另一种写法)：

job:
  schedules:
    cron1: 10 * * * * *
    cron2: 20 * * * * *

@Data
@Configuration
@ConfigurationProperties(prefix="job.schedules")
public class ScheduledConfig {

    private String cron1;
    private String cron2;

    @Bean
    public String cron1() {
        return this.cron1;
    }

    @Bean
    public String cron2() {
        return this.cron2;
    }

}

@Component
public class Job1 {

    @Scheduled(cron = "#{@cron1}")
    public void jobScheduled() {

        //......

    }
}

 

 

转载自，内容有增加：https://www.icode9.com/content-1-558112.html