> 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/ix.-how-to-guides/74.-properties-and-configuration/74.1.-automatically-expand-properties-at-build-time.md).

# 74.1. 运行时暴露属性

相对于在项目构建配置中硬编码某些配置，你可以使用已存在的构建配置自动暴露它们。Maven和Gradle都支持。