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                ###43.1 理解自動配置的beans 從底層來講,自動配置(auto-configuration)是通過標準的`@Configuration`類實現的。此外,`@Conditional`注解用來約束自動配置生效的條件。通常自動配置類需要使用`@ConditionalOnClass`和`@ConditionalOnMissingBean`注解,這是為了確保只有在相關的類被發現及沒有聲明自定義的`@Configuration`時才應用自動配置,具體查看[`spring-boot-autoconfigure`](https://github.com/spring-projects/spring-boot/tree/v1.4.1.RELEASE/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure)源碼中的`@Configuration`類(`META-INF/spring.factories`文件)。
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