springboot自动配置原理图

@ImportAutoConfigurationPackages.Registrar.calss

@ImportAutoConfigurationImportSelector.class

selectImports通过SpringFactoriesLoader.loadFactoryNames加载META-INF/spring.factory的EnableAutoConfiguration

@AutoConfigurationPackage

@SpringBootConfiguration

@SpringBootApplication

@ComponentScan

@EnableAutoConfiguration

@Configuration

ImportBeanDefinitionRegistrar注册扫描路径到全局变量，提供查询

@Configuration+@Bean加载配置，完成自动装配