# 5.4 小结

* 可以使用 @ConfigurationProperties 注解 Spring bean，以支持从几个属性源之一注入值。
* 可以在命令行参数、环境变量、JVM 系统属性、属性文件或 YAML 文件等选项中设置配置属性。
* 配置属性可用于覆盖自动配置设置，包括指定数据源 URL 和日志级别的能力。
* Spring profile 文件可以与属性源一起使用，根据活动配置文件有条件地设置配置属性。


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