第二十三章 SpringBoot @SpringBootApplication注解源码解析

@SpringBootApplication是SpringBoot的核心注解，它是一个组合注解，源码如下

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@SpringBootConfiguration
@EnableAutoConfiguration
@ComponentScan(excludeFilters = @Filter(type = FilterType.CUSTOM, classes = TypeExcludeFilter.class))
public @interface SpringBootApplication {

Class<?>[] exclude() default {};

String[] excludeName() default {};

@AliasFor(annotation = ComponentScan.class, attribute = "basePackages")
String[] scanBasePackages() default {};

@AliasFor(annotation = ComponentScan.class, attribute = "basePackageClasses")
Class<?>[] scanBasePackageClasses() default {};

}

@SpringBootApplication组合了@Configuration，@EnableAutoConfiguration以及@ComponentScan，若不使用@SpringBootApplication注解，则可以在入口类上直接使用@Configuration，@EnableAutoConfiguration、@ComponentScan

禁用特定的自动配置

@SpringBootApplication(exclude={DataSourceAutoConfiguration.class})