Configuration Classes
Spring Boot 偏好基于 Java 的配置。虽然可以使用 SpringApplication 与 XML 源一起使用，但我们通常建议你的主要源是一个 @Configuration 类。通常，定义 main 方法的类是作为主要 @Configuration 的一个好候选者。
Spring Boot favors Java-based configuration.
Although it is possible to use SpringApplication with XML sources, we generally recommend that your primary source be a single @Configuration class.
Usually the class that defines the main method is a good candidate as the primary @Configuration.
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网上发表了很多 Spring 配置示例，这些示例使用 XML 配置。如果可能，请始终尝试使用等效的基于 Java 的配置。搜索 |
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Many Spring configuration examples have been published on the Internet that use XML configuration.
If possible, always try to use the equivalent Java-based configuration.
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Importing Additional Configuration Classes
你无需将所有 @Configuration 都放入一个类中。可以 @Import 注解用于导入其他配置类。或者，你可以使用 @ComponentScan 自动拾取所有 Spring 组件，包括 @Configuration 类。
You need not put all your @Configuration into a single class.
The @Import annotation can be used to import additional configuration classes.
Alternatively, you can use @ComponentScan to automatically pick up all Spring components, including @Configuration classes.
Importing XML Configuration
如果确实必须使用基于 XML 的配置，我们建议你仍然从 @Configuration 类开始。然后你可以使用 @ImportResource 注解加载 XML 配置文件。
If you absolutely must use XML based configuration, we recommend that you still start with a @Configuration class.
You can then use an @ImportResource annotation to load XML configuration files.