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,谢谢大家对呐喊教程的支持。
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