Spring Boot应用事件监听
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：
-
ApplicationStartingEvent:在任何处理(除了注册listener和initializer)开始之前发送。 -
ApplicationEnvironmentPreparedEvent: 在context创建之前，而用到context中的Environment已经被识别时发送。 -
ApplicationContextInitializedEvent:SpringApplication正在启动，ApplicationContext已准备好且ApplicationContextInitializer已被调用但是bean的定义还没有被加载时发送。 -
ApplicationPreparedEvent: 在context刷新之前，在bean的定义已经被加载之后调用。 -
ApplicationStartedEvent: 在任何应用和command-line runner调用之前，而context已经被刷新时发送。 -
ApplicationReadyEvent: 在任何应用和command-line runner被调用的时候发送，它意味着应用可以接受请求了。 -
ApplicationFailedEvent: 在启动时有异常的时候发送。
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：
@EventListener ApplicationListener<Event>
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(...)
src/main/resources/META-INF/spring.factories
下：
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
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());
}
}
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