Spring Boot:从 YAML 文件加载 @Value

2022-01-14 00:00:00 yaml spring java spring-boot

我需要从 .yml 文件中加载一个属性，该文件包含应用程序可以从中读取文件的文件夹的路径.

I need to load a property from a .yml file, which contains the path to a folder where the application can read files from.

我正在使用以下代码注入属性:

I'm using the following code to inject the property:

@Value("${files.upload.baseDir}")
private String pathToFileFolder;

用于开发的 .yml 文件位于 src/main/resources/config/application.yml 下，我在生产中使用以下命令运行应用程序，以覆盖开发设置:

The .yml file for development is located under src/main/resources/config/application.yml, im running the application with the following command in production, to override the development settings:

java -jar app.jar --spring.config.location=/path/to/application-production.yml

Spring Boot 文档说:

The Spring Boot documentation says:

SpringApplication 将从以下位置的 application.properties 文件中加载属性并将它们添加到 Spring 环境中:

SpringApplication will load properties from application.properties files in the following locations and add them to the Spring Environment:

  1. 当前目录的/config 子目录.

  1. A /config subdirectory of the current directory.

当前目录

类路径/config 包

A classpath /config package

类路径根

还有:

您还可以使用 YAML ('.yml') 文件来替代.properties".

You can also use YAML ('.yml') files as an alternative to '.properties'.

.yml 文件包含:

{...}
files:
      upload:
        baseDir: /Users/Thomas/Code/IdeaProjects/project1/files
{...}

我的 Application 类被注释为:

@SpringBootApplication
@EnableCaching

当我运行应用程序时，我得到一个异常:

When I run the application, i get an exception:

Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'files.upload.baseDir' in string value "${files.upload.baseDir}"

是否必须使用 YamlPropertySourceLoader 类或添加特殊注解才能在 Spring Boot 中启用对 .yml 的支持?

Do I have to use the YamlPropertySourceLoader class or add a special annotation to enable the support for .yml in Spring Boot?

.yml 文件包含一些其他属性，这些属性可以由 Spring Boot 成功加载，例如 dataSource.XXX 或 hibernate.XXX.

The .yml file contains some other properties, which get successfully loaded by Spring Boot like dataSource.XXXor hibernate.XXX.

推荐答案

M.Deinum 是对的，我提供的设置正在运行 - yml 文件缩进错误，因此无法找到该属性.

M. Deinum is right, the setup i've provided is working - the yml file was indented wrong, so the property couldn't be found.

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