以下选自官方的文档
这里写链接内容
Many Spring Boot developers always have their main class annotated with
@Configuration,
@EnableAutoConfiguration,
@ComponentScan.
Since these annotations are so frequently used together (especially if you follow the best practices above), Spring Boot provides a convenient @SpringBootApplication alternative.
翻译：许多SpringBoot的开发者都喜欢在主方法中注解。
因为这些注解是很频繁的在一起使用，SpringBoot提供了一个更加便捷的注解@SpringBootApplication，来替代三个一起使用。
意思就是：一个抵三个。
@Configuration：配置
@EnableAutoConfiguration：自动加载配置
@ComponentScan：扫描指定的包
The @SpringBootApplication annotation is equivalent to using @Configuration, @EnableAutoConfiguration, and @ComponentScan with their default attributes, as shown in the following example:
package com.example.myapplication;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication // same as @Configuration @EnableAutoConfiguration @ComponentScan
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
ps：@SpringBootApplication also provides aliases to customize the attributes of @EnableAutoConfiguration and @ComponentScan.
