SpringApplication initialize 方法：
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private void (Object[] sources) {
if (sources != null && sources.length > 0) {
this.sources.addAll(Arrays.asList(sources));
}
this.webEnvironment = this.deduceWebEnvironment();
this.setInitializers(this.getSpringFactoriesInstances(ApplicationContextInitializer.class));
this.setListeners(this.getSpringFactoriesInstances(ApplicationListener.class));
this.mainApplicationClass = this.deduceMainApplicationClass();
}
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setListeners 方法即找到 ApplicationListener 类并实例化
ApplicationListener 是 Spring 框架中事件监听器接口，即 SpringApplicationRunListener 发布通知事件时，由 ApplicationListener 负责接收。具体可以参考 Spring 事件监听机制。
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public interface ApplicationListener<E extends ApplicationEvent> extends EventListener {
void onApplicationEvent(E var1);
}
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后续的过程和 ApplicationContextInitializer 实现类的实例化无太大差异。
ApplicationListener 在 SpringBoot 中包含两块：
spring-boot-x.x.x.RELEASE.jar/META-INF/spring.factories中：
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# Application Listeners
org.springframework.context.ApplicationListener=
org.springframework.boot.ClearCachesApplicationListener,
org.springframework.boot.builder.ParentContextCloserApplicationListener,
org.springframework.boot.context.FileEncodingApplicationListener,
org.springframework.boot.context.config.AnsiOutputApplicationListener,
org.springframework.boot.context.config.ConfigFileApplicationListener,
org.springframework.boot.context.config.DelegatingApplicationListener,
org.springframework.boot.liquibase.LiquibaseServiceLocatorApplicationListener,
org.springframework.boot.logging.ClasspathLoggingApplicationListener,
org.springframework.boot.logging.LoggingApplicationListener
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spring-boot-autoconfigure-x.x.x.RELEASE.jar/META-INF/spring.factories中：
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# Application Listeners
org.springframework.context.ApplicationListener=
org.springframework.boot.autoconfigure.BackgroundPreinitializer
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