spring_reference/IX. ‘How-to’ guides/63.1. Externalize the confi...

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### 63.1. 外部化SpringApplication配置
SpringApplication已经被属性化主要是setters所以你可以在创建应用时使用它的Java API修改它的行为。或者你可以使用properties文件中的`spring.main.*`来外部化(在应用代码外配置)这些配置。比如,在`application.properties`中可能会有以下内容:
```java
spring.main.web_environment=false
spring.main.show_banner=false
```
然后Spring Boot在启动时将不会显示banner并且该应用也不是一个web应用。