Spring Boot 事件监听器不接收事件

Question

我的 EventListener 注释没有收到任何 Spring 事件。这是我的代码：

@Component
public class ProxyConfig {

    public ProxyConfig() {
        System.out.println("I can see this in the console");
    }

    @EventListener
    public void onApplicationEvent(ApplicationEnvironmentPreparedEvent event) {
        System.out.println("WON'T WORK :-(");  // FIXME
    }

    @EventListener
    public void test(ApplicationStartedEvent event) {
        System.out.println("WON'T WORK :-(");  // FIXME
    }
}

这是我的 Application class:

@SpringBootApplication
public class Application {
    public static void main(String[] args) throws Exception {
        SpringApplication.run(MyApp.class, args);
    }
}

根据 https://spring.io/blog/2015/02/11/better-application-events-in-spring-framework-4-2 and https://solidsoft.wordpress.com/2015/09/29/annotation-driven-event-listeners-in-spring-4-2/ 它一定能正常工作，但它仍然无法打印我的 "WON'T WORK :-(" 字符串 :(

有什么想法吗？

谢谢！

Answer 1

您正在侦听的两个事件都在应用程序生命周期的早期发布。

ApplicationStartedEvent发送"as early as conceivably possible as soon as a SpringApplication has been started - before the Environment or ApplicationContext is available, but after the ApplicationListeners have been registered"。

ApplicationEnvironmentPreparedEvent 已发布 "when a SpringApplication is starting up and the Environment is first available for inspection and modification."

在这两种情况下，事件发布得太早，无法通过注释和应用程序上下文找到侦听器。正如您所观察到的，您可以使用 spring.factories 来注册您的侦听器。或者，您可以在 SpringApplication.

上使用 setter 方法

Spring Boot 事件监听器不接收事件

SpringBoot EventListener don't receive events

java

spring

event-listener

spring-boot