@SpringBootApplication注解用在Spring Boot的入口类上面,是应用启动相关的注解。
直接看注解的源码:
@Target(ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) @Documented @Inherited @SpringBootConfiguration @EnableAutoConfiguration @ComponentScan(excludeFilters = { @Filter(type = FilterType.CUSTOM, classes = TypeExcludeFilter.class), @Filter(type = FilterType.CUSTOM, classes = AutoConfigurationExcludeFilter.class) }) public @interface SpringBootApplication { @AliasFor(annotation = EnableAutoConfiguration.class, attribute = "exclude") Class<?>[] exclude() default {}; @AliasFor(annotation = EnableAutoConfiguration.class, attribute = "excludeName") String[] excludeName() default {}; @AliasFor(annotation = ComponentScan.class, attribute = "basePackages") String[] scanBasePackages() default {}; @AliasFor(annotation = ComponentScan.class, attribute = "basePackageClasses") Class<?>[] scanBasePackageClasses() default {};
}
查看源码,可以发现@SpringBootApplication是一个复合注解,包含了@SpringBootConfiguration,@EnableAutoConfiguration和@ComponentScan三个注解。