查看“Spring Boot 自动配置图示”的源代码

{| class="wikitable"
! colspan="7" |@SpringBootApplication
|-
|@SpringBootConfiguration
! colspan="5" |@EnableAutoConfiguration
|@ComponentScan(excludeFilters = { 
@Filter(type = FilterType.CUSTOM, classes = TypeExcludeFilter.class),

@Filter(type = FilterType.CUSTOM, classes = AutoConfigurationExcludeFilter.class) 

})
|-
|@Configuration
! colspan="4" |@AutoConfigurationPackage
|@Import(AutoConfigurationImportSelector.class)
|
|-
|
|@Retention(RetentionPolicy.RUNTIME)
|@Documented
|@Inherited
|//给容器中导入一个组件

@Import(AutoConfigurationPackages.Registrar.class) 
|AutoConfigurationImportSelector.java
方法 selectImports 

-> 方法 getAutoConfigurationEntry

-> 方法 getCandidateConfigurations

-> SpringFactoriesLoader.loadFactoryNames

加载所有 jar 包下 META-INF/spring.factories

关键位置：

spring-boot-2.3.4.RELEASE.jar

spring-boot-autoconfigure-2.3.4.RELEASE.jar

尤其是

spring-boot-autoconfigure-2.3.4.RELEASE.jar

的 /META-INF/spring.factories

里面有大量自动配置类

最后再进行条件装配
|
|-
|
|
|
|
|AutoConfigurationPackages.java
static class Registrar

导入 @SpringBootApplication 注解标注类的包下的所有组件
|
|
|}