spring_reference/IV. Spring Boot features/23.5. Placeholders in prope...

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### 23.5. 属性占位符
当application.properties里的值被使用时它们会被存在的Environment过滤所以你能够引用先前定义的值比如系统属性
```java
app.name=MyApp
app.description=${app.name} is a Spring Boot application
```
**注**你也能使用相应的技巧为存在的Spring Boot属性创建'短'变量,具体参考[Section 63.3, “Use short command line arguments”](http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#howto-use-short-command-line-arguments)。