• • • 引导加载自动配置
    • • @SpringBootApplication分析
      • • ss @EnableAutoConfiguration核心注解一：@AutoConfigurationPackage
        • ss @EnableAutoConfiguration核心注解二：@Import(AutoConfigurationImportSelector.class)
    • 按需开启自动配置项
    • 修改默认配置
    • • 总结：
      • 流程：
      • SpringBoot开发步骤

引导加载自动配置

@SpringBootApplication分析

@SpringBootConfiguration
@EnableAutoConfiguration
@ComponentScan(
    excludeFilters = {@Filter(
    type = FilterType.CUSTOM,
    classes = {TypeExcludeFilter.class}
), @Filter(
    type = FilterType.CUSTOM,
    classes = {AutoConfigurationExcludeFilter.class}
)}
)

ssdss@SpringBootApplication = @SpringBootConfiguration➕@ComponentScan➕@EnableAutoConfiguration

s ddsss1. @SpringBootConfiguration ：代表当前是一个配置类

s ddsss2. @ComponentScan ：指定扫描哪些，参考Spring注解

s ddsss3. @EnableAutoConfiguration = @AutoConfigurationPackage ➕ @Import（重点）

@AutoConfigurationPackage
@Import({AutoConfigurationImportSelector.class})
public @interface EnableAutoConfiguration {
    String ENABLED_OVERRIDE_PROPERTY = "spring.boot.enableautoconfiguration";
    Class<?>[] exclude() default {};
    String[] excludeName() default {};
}

ss @EnableAutoConfiguration核心注解一：@AutoConfigurationPackage

sdssdss作用：制定了默认包规则并自动配置包

@Import({Registrar.class})							❤