我使用RefreshScopeRefreshedEvent成功地从consult配置服务器获取并覆盖了这些值

import java.text.SimpleDateFormat;
import java.util.Date;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.cloud.context.scope.refresh.RefreshScopeRefreshedEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
@RefreshScope
public class AlertSchedulerCron implements ApplicationListener<RefreshScopeRefreshedEvent> {

    private SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

    @Value("${pollingtime}")
    private String pollingtime;

    /*
     * @Value("${interval}") private String interval;
     */
    @Scheduled(cron = "${pollingtime}")
    //@Scheduled(fixedRateString = "${interval}" )
    public void task() {

        System.out.println(pollingtime);
        System.out.println("Scheduler (cron expression) task with duration : " + sdf.format(new Date()));
    }

    @Override
    public void onApplicationEvent(RefreshScopeRefreshedEvent event) {
        // TODO Auto-generated method stub

    }

}

以下是我们解决此问题的方法。

/**
 * Listener of Spring's lifecycle to revive Scheduler beans, when spring's
 * scope is refreshed.
 * <p>
 * Spring is able to restart beans, when we change their properties. Such a
 * beans marked with RefreshScope annotation. To make it work, spring creates
 * <b>lazy</b> proxies and push them instead of real object. The issue with
 * scope refresh is that right after refresh in order for such a lazy proxy
 * to be actually instantiated again someone has to call for any method of it.
 * <p>
 * It creates a tricky case with Schedulers, because there is no bean, which
 * directly call anything on any Scheduler. Scheduler lifecycle is to start
 * few threads upon instantiation and schedule tasks. No other bean needs
 * anything from them.
 * <p>
 * To overcome this, we had to create artificial method on Schedulers and call
 * them, when there is a scope refresh event. This actually instantiates.
 */
@RequiredArgsConstructor
public class RefreshScopeListener implements ApplicationListener<RefreshScopeRefreshedEvent> {
    private final List<RefreshScheduler> refreshSchedulers;

    @Override
    public void onApplicationEvent(RefreshScopeRefreshedEvent event) {
        refreshSchedulers.forEach(RefreshScheduler::materializeAfterRefresh);
    }
}

因此，我们定义了一个接口，它不做任何特别的事情，但允许我们调用一个刷新的作业。

public interface RefreshScheduler {
    /**
     * Used after refresh context for scheduler bean initialization
     */
    default void materializeAfterRefresh() {
    }
}

这是实际作业，可以刷新其参数from.properties。

public class AJob implements RefreshScheduler {
    @Scheduled(cron = "${from.properties}")
    public void aTask() {
        // do something useful
    }
}

更新：当然，AJob bean必须在@Configuration中标记@RefreshScope

@Configuration
@EnableScheduling
public class SchedulingConfiguration {
    @Bean
    @RefreshScope
    public AJob aJob() {
        return new AJob();
    }
}

我的解决方案包括听EnvironmentChangeEvent

@Configuration
public class SchedulingSpringConfig implements ApplicationListener<EnvironmentChangeEvent>, SchedulingConfigurer {

  private static final Logger LOGGER = LoggerFactory.getLogger(SchedulingSpringConfig.class);

  private final DemoProperties demoProperties;

  public SchedulingSpringConfig(DemoProperties demoProperties) {
    this.demoProperties = demoProperties;
  }

  @Override
  public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
    LOGGER.info("Configuring scheduled task with cron expression: {}", demoProperties.getCronExpression());
    taskRegistrar.addTriggerTask(triggerTask());
    taskRegistrar.setTaskScheduler(taskScheduler());
  }

  @Bean
  public TriggerTask triggerTask() {
    return new TriggerTask(this::work, cronTrigger());
  }

  private void work() {
    LOGGER.info("Doing work!");
  }

  @Bean
  @RefreshScope
  public CronTrigger cronTrigger() {
    return new CronTrigger(demoProperties.getCronExpression());
  }

  @Bean
  public ThreadPoolTaskScheduler taskScheduler() {
    return new ThreadPoolTaskScheduler();
  }

  @Override
  public void onApplicationEvent(EnvironmentChangeEvent event) {
    if (event.getKeys().contains("demo.config.cronExpression")) {
      ScheduledTasksRefresher scheduledTasksRefresher = new ScheduledTasksRefresher(triggerTask());
      scheduledTasksRefresher.afterPropertiesSet();
    }
  }
}

然后使用ContextLifecycleScheduledTaskRegistrar重新创建任务。

public class ScheduledTasksRefresher extends ContextLifecycleScheduledTaskRegistrar {

  private final TriggerTask triggerTask;

  ScheduledTasksRefresher(TriggerTask triggerTask) {
    this.triggerTask = triggerTask;
  }

  @Override
  public void afterPropertiesSet() {
    super.destroy();
    super.addTriggerTask(triggerTask);
    super.afterSingletonsInstantiated();
  }
}

属性定义：

@ConfigurationProperties(prefix = "demo.config", ignoreUnknownFields = false)
public class DemoProperties {

  private String cronExpression;

  public String getCronExpression() {
    return cronExpression;
  }

  public void setCronExpression(String cronExpression) {
    this.cronExpression = cronExpression;
  }
}

主要定义：

@SpringBootApplication
@EnableConfigurationProperties(DemoProperties.class)
@EnableScheduling
public class DemoApplication {

  public static void main(String[] args) {
    SpringApplication.run(DemoApplication.class, args);
  }
}

根据前面的回答，我添加了以下接口，并在@RefreshScope注解bean上使用它：

public interface RefreshScopeScheduled {

    @EventListener(RefreshScopeRefreshedEvent.class)
    default void onApplicationEvent() { /*do nothing*/ }

}