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### 36.3. Condition注解
你几乎总是需要在你的auto-configuration类里添加一个或更多的@Condition注解。@ConditionalOnMissingBean注解是一个常见的示例，它经常用于允许开发者覆盖auto-configuration，如果他们不喜欢你提供的默认行为。
Spring Boot包含很多@Conditional注解，你可以在自己的代码中通过注解@Configuration类或单独的@Bean方法来重用它们。