Application配置文件的解析1、ConfigFileApplicationListener是通过查找META-I

1、ConfigFileApplicationListener是通过查找META-INF/spring.factories文件

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2、ConfigFileApplicationListener的继承关系如图：

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3、负责监听以下两种事件的触发：

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ApplicationEnvironmentPreparedEvent事件的触发过程：
    SpringApplication#run
        |
    SpringApplication#prepareEnvironment
        |
    SpringApplicationRunListeners#environmentPrepared
        |
    EventPublishingRunListener#environmentPrepared
        |
    SimpleApplicationEventMulticaster#multicasterEvent发布ApplicationEnvironmentPreparedEvent事件

ApplicationPreparedEvent事件的触发过程：
    SpringApplication#run
        |
    SpringApplication#prepareContext
        |
    SpringApplicationRunListeners#contextLoaded
        |
    EventPublishingRunListener#contextLoaded
        |
    SimpleApplicationEventMulticaster#multicasterEvent发布ApplicationPreparedEvent事件