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                ### 24.7.5 @ConfigurationProperties vs. @Value `@Value`是Spring容器的一個核心特性,它沒有提供跟type-safe Configuration Properties相同的特性。下面的表格總結了`@ConfigurationProperties`和`@Value`支持的特性: |特性|`@ConfigurationProperties`|`@Value`| |---|---|---| |[Relaxed綁定](http://docs.spring.io/spring-boot/docs/1.4.1.RELEASE/reference/htmlsingle/#boot-features-external-config-relaxed-binding)|Yes|No| |[Meta-data支持](http://docs.spring.io/spring-boot/docs/1.4.1.RELEASE/reference/htmlsingle/#configuration-metadata)|Yes|No| |`SpEL`表達式|No|Yes| 如果你為自己的組件定義了一系列的配置keys,我們建議你將它們以`@ConfigurationProperties`注解的POJO進行分組。由于`@Value`不支持relaxed綁定,所以如果你使用環境變量提供屬性值的話,它就不是很好的選擇。最后,盡管`@Value`可以寫`SpEL`表達式,但這些表達式不會處理來自[Application屬性文件](http://docs.spring.io/spring-boot/docs/1.4.1.RELEASE/reference/htmlsingle/#boot-features-external-config-application-property-files)的屬性。
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