作者：平凡希
原文：https://www.cnblogs.com/xiaoxi/p/7999885.html

　　我們開發任何一個Spring Boot專案，都會用到如下的啟動類

@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

　　從上面程式碼可以看出，Annotation定義（@SpringBootApplication）和類定義（SpringApplication.run

1. SpringBootApplication背後的祕密

　　@SpringBootApplication註解是Spring Boot的核心註解，它其實是一個組合註解：

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@SpringBootConfiguration
@EnableAutoConfiguration
@ComponentScan(excludeFilters = {
        @Filter(type = FilterType.CUSTOM, classes = TypeExcludeFilter.class),
        @Filter(type = FilterType.CUSTOM, classes = AutoConfigurationExcludeFilter.class) })
public @interface SpringBootApplication {
...
}