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Spring Boot应用事件监听 Spring Boot应用事件监听示例详解

wiselyman 人气:0

前言

本文主要给大家介绍了关于Spring Boot应用事件监听的相关内容,分享出来供大家参考学习,下面话不多说了,来一起看看详细的介绍吧

1. Spring Boot特有的应用事件

除了Spring框架的事件,Spring Boot的SpringApplication也发送了一些自己的事件:

有些事件是在ApplicationContext创建之前触发的,所以我们不能用常规的注册成bean的事件监听方式:

像ApplicationStartedEvent和ApplicationReadyEvent是ApplicationContext创建之后触发的,可以用上述两种方式来监听事件。

2. 如何监听这些事件

我们可以通过下面的方式注册监听:

2.1. SpringApplication.addListeners(...)

SpringApplication application = new SpringApplication(StartEventsApplication.class);
application.addListeners(
  (ApplicationListener<ApplicationStartingEvent>) event -> log.info("----------- 监听Spring Boot:" + event.getClass().getSimpleName()),
  (ApplicationListener<ApplicationEnvironmentPreparedEvent>) event -> log.info("----------- 监听Spring Boot:" + event.getClass().getSimpleName()),
  (ApplicationListener<ApplicationContextInitializedEvent>) event -> log.info("----------- 监听Spring Boot:" + event.getClass().getSimpleName()),
  (ApplicationListener<ApplicationPreparedEvent>) event -> log.info("----------- 监听Spring Boot:" + event.getClass().getSimpleName()),
  (ApplicationListener<ApplicationStartedEvent>) event -> log.info("----------- 监听Spring Boot:" + event.getClass().getSimpleName()),
  (ApplicationListener<ApplicationReadyEvent>) event -> log.info("----------- 监听Spring Boot:" + event.getClass().getSimpleName())
);
application.run(args);

2.2. SpringApplicationBuilder.listeners(...)

new SpringApplicationBuilder()
   .sources(StartEventsApplication.class)
   .listeners(
     (ApplicationListener<ApplicationStartingEvent>) event -> log.info("----------- 监听Spring Boot:" + event.getClass().getSimpleName()),
     (ApplicationListener<ApplicationEnvironmentPreparedEvent>) event -> log.info("----------- 监听Spring Boot:" + event.getClass().getSimpleName()),
     (ApplicationListener<ApplicationContextInitializedEvent>) event -> log.info("----------- 监听Spring Boot:" + event.getClass().getSimpleName()),
     (ApplicationListener<ApplicationPreparedEvent>) event -> log.info("----------- 监听Spring Boot:" + event.getClass().getSimpleName()),
     (ApplicationListener<ApplicationStartedEvent>) event -> log.info("----------- 监听Spring Boot:" + event.getClass().getSimpleName()),
     (ApplicationListener<ApplicationReadyEvent>) event -> log.info("----------- 监听Spring Boot:" + event.getClass().getSimpleName())
     )
   .run(args);

2.3. META-INF/spring.factories

src/main/resources/META-INF/spring.factories:

org.springframework.context.ApplicationListener=top.wisely.startevents.listeners.ApplicationContextInitializedEventListener, \
            top.wisely.startevents.listeners.ApplicationEnvironmentPreparedEventListener, \
            top.wisely.startevents.listeners.ApplicationPreparedEventListener, \
            top.wisely.startevents.listeners.ApplicationReadyEventListener, \
            top.wisely.startevents.listeners.ApplicationStartedEventListener, \
            top.wisely.startevents.listeners.ApplicationStartingEventListener

监听器只需实现ApplicationListener<要监听的接口类型>接口,无需手动注册为bean:

public class ApplicationStartedEventListener implements ApplicationListener<ApplicationStartedEvent> {
 @Override
 public void onApplicationEvent(ApplicationStartedEvent event) {
  log.info("----------- 监听Spring Boot:" + event.getClass().getSimpleName());
 }
}

3. 源码地址

https://github.com/wiselyman/spring-boot-application-events.git (本地下载

总结

以上就是这篇文章的全部内容了,希望本文的内容对大家的学习或者工作具有一定的参考学习价值,如果有疑问大家可以留言交流,谢谢大家对的支持。

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