# 6.6. 使用@SpringBootApplication注解

许多 Spring Boot 开发人员喜欢他们的应用程序使用自动配置、组件扫描并能够在其“应用程序类”上定义额外的配置。可以使用单个`@SpringBootApplication`注释来启用这三个功能，即：

* `@EnableAutoConfiguration`：启用[Spring Boot的自动配置机制](https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#using.auto-configuration)
* `@ComponentScan`：对应用程序所在的包启用`@Component`扫描（请参阅[最佳实践](https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#using.structuring-your-code)）
* `@SpringBootConfiguration`：允许在上下文中注册额外的bean或导入额外的配置类。Spring 标准的`@Configuration`替代方案，有助于集成测试中的[配置检测。](https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#features.testing.spring-boot-applications.detecting-configuration)

```
// Same as @SpringBootConfiguration @EnableAutoConfiguration @ComponentScan
@SpringBootApplication
public class MyApplication {
​
    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }
​
}
```

> `@SpringBootApplication`还提供别名来自定义`@EnableAutoConfiguration`和`@ComponentScan`的属性。
>
> 这些功能都不是强制性的，您可以选择用它启用的任何功能来替换此单个注释。例如，您可能不想在应用程序中使用组件扫描或配置属性扫描：
>
> ```
> @SpringBootConfiguration(proxyBeanMethods = false)
> @EnableAutoConfiguration
> @Import({ SomeConfiguration.class, AnotherConfiguration.class })
> public class MyApplication {
> ​
>     public static void main(String[] args) {
>         SpringApplication.run(MyApplication.class, args);
>     }
> ​
> }
> ```
>
> 在此示例中，`MyApplication`与任何其他 Spring Boot 应用程序一样，只是不会自动检测`@Component`-annotated 类和`@ConfigurationProperties`-annotated 类，并且显式导入用户定义的 bean（请参阅 `@Import`参考资料）。


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