Java SpringBoot自动装配原理详解及源码注释

 @SpringBootConfiguration: springboot的配置
 
        @configuration:spring配置类
 
        @Component:   说明这也是一个spring组件
 
@EnableAutoConfiguration:自动配置
 
        @AutoConfigurationPackage：自动配置包
            @Import(AutoConfigurationPackages.Registrar.class):自动配置'包注册'
        @Import(AutoConfigurationImportSelector.class):自动配置导入选择
//获取所有的配置
List<String> configurations = getCandidateConfigurations(annotationMetadata,attributes);

protected List<String> getCandidateConfigurations(AnnotationMetadata metadata,
  AnnotationAttributes attributes) {
  List<String> configurations = SpringFactoriesLoader.loadFactoryNames(
        getSpringFactoriesLoaderFactoryClass(), getBeanClassLoader());
   Assert.notEmpty(configurations,
	 "No auto configuration classes found in META-INF/spring.factories. If you "
	+ "are using a custom packaging, make sure that file is correct.");
   return configurations;
}

Properties properties = PropertiesLoaderUtils.loadProperties(resource);
所有资源加载到配置类中！