@SpringBootApplication
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1. spring 文档说明
Many Spring Boot developers always have their main class annotated with @Configuration, @EnableAutoConfiguration and @ComponentScan. Since these annotations are so frequently used together (especially if you follow the best practices above), Spring Boot provides a convenient @SpringBootApplication alternative.
The @SpringBootApplication annotation is equivalent to using @Configuration, @EnableAutoConfiguration and @ComponentScan with their default attributes。
@SpringBootApplication是 @Configuration, @EnableAutoConfiguration and @ComponentScan 的组合。
使用时一般写明要扫描的包 @SpringBootApplication(scanBasePackages="com.example")
stereotype annotations 构造型注解
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