​SpringBoot开箱即用原理

启动类@SpringBootApplication注解里面包含了两个注解@SpringBootConfiguration和@EnableAutoConfiguration。

//@SpringBootApplication 标注，是一个SpringBoot应用
@SpringBootApplication
public class SpringbootdemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringbootdemoApplication.class, args);
    }
}

@SpringBootConfiguration//核心
@EnableAutoConfiguration//核心
@ComponentScan(excludeFilters = { @Filter(type = FilterType.CUSTOM, classes = TypeExcludeFilter.class),
        @Filter(type = FilterType.CUSTOM, classes = AutoConfigurationExcludeFil