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                許多Spring Boot開發人員喜歡他們的應用程序使用自動配置,組件掃描,并能夠在他們的“應用程序類”上定義額外的配置。注解`@SpringBootApplication`用來開啟下面的功能: * `@EnableAutoConfiguration`:開啟自動配置機制 * `@ComponentScan`:在類所在位置開啟`@Component`掃描 * `@Configuration`:允許在上下文中注冊額外的bean或導入其他配置類 `@SpringBootApplication`等效于使用了3個默認配置的注解`@Configuration`, `@EnableAutoConfiguration`, 和 `@ComponentScan`,如下所示: ~~~java 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); } } ~~~ `@SpringBootApplication`還提供別名來自定義`@EnableAutoConfiguration`和`@ComponentScan`的屬性。 這些功能都不是必需的,您可以選擇其他功能的注解替換此單個注解。 例如,您可能不希望在應用程序中使用組件掃描: ~~~java package com.example.myapplication; import org.springframework.boot.SpringApplication; import org.springframework.context.annotation.ComponentScan import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.Import; @Configuration @EnableAutoConfiguration @Import({ MyConfig.class, MyAnotherConfig.class }) public class Application { public static void main(String[] args) { SpringApplication.run(Application.class, args); } } ~~~ 在這個例子中`Application`包含了springboot的所有特定除了自動掃描`@Component`組件,然后使用`@Import`明確引入了用戶定義的bean.
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