Question

我已经实现了这种逻辑

@Component
public class SomeUpdater {

    @Autowired
    private ApplicationEventPublisher applicationEventPublisher;
    private ExecutorService executorService;

    @PostConstruct
    public void init(){
        executorService = Executors.newSingleThreadExecutor();
        executorService.execute(()->{
            //some logic
            applicationEventPublisher.publishEvent(new PurposeEvent(this, 5));
        });
    }

}

@Component
public class SomeClass {

    @EventListener
    public void update(PurposeEvent purposeEvent){
        //update
    }
}

但是我从日志中看到，update (PurposeEvent purposeEvent)的侦听器在调用方法applicationEventPublisher.publishEvent(new PurposeEvent(this, 5));之后被初始化。初始化后如何调用逻辑？我尝试将@EventListener用于ContextRefreshedEvent，但据我了解，它可以多次调用

Answer 1

您可以注释@DependsOn，这可以强制Spring容器在使用@DependsOn注释进行注释的bean之前初始化一个或多个bean。然后，您将确定SomeClass将在SomeUpdater之前初始化。

长期解决方案是：

Spring Boot启动挂钩
Spring事件类型，例如ApplicationStartedEvent，ApplicationReadyEvent。

有用的链接： http://dolszewski.com/spring/running-code-on-spring-boot-startup/ http://javainfinite.com/spring-boot/springboot-applicationreadyevent-applicationfailedevent-contextrefreshedevent/

Answer 2

您可以利用如下所示的春季活动，

@EventListener(ApplicationReadyEvent.class)
public void init() {
    final ExecutorService executorService = Executors.newSingleThreadExecutor();
    executorService.execute(() -> {
        //some logic
        applicationEventPublisher.publishEvent(new PurposeEvent(this, 5));
    });
}

春季：初始化应用后如何启动逻辑

2 个答案: