> For the complete documentation index, see [llms.txt](https://jack80342.gitbook.io/spring-boot/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jack80342.gitbook.io/spring-boot/iv.-spring-boot-features/25.-profiles.md).

# 25. Profiles

Spring Profiles提供了一种隔离应用程序配置的方式，并让这些配置只在特定的环境下生效。任何`@Component`或`@Configuration`都能注解`@Profile`，从而限制加载它的时机：

```java
@Configuration
@Profile("production")
public class ProductionConfiguration {

    // ...

}
```

你可以使用`spring.profiles.active`的`Environment`属性来指定哪个配置生效。你可以使用在这一章的前面描述过的任何方式来指定该属性。例如，可以将它包含到`application.properties`中：

```java
spring.profiles.active=dev,hsqldb
```

或使用命令行开关：

```
--spring.profiles.active=dev,hsqldb
```


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