Spring Boot @ConfigurationProperties YAML 引用 [英] Spring Boot @ConfigurationProperties YAML referencing

问题描述

我真的很喜欢 Spring 的 @ConfigurationProperties 功能，它通过 YAML 将我的配置属性加载到 Java 类中.

I really like the @ConfigurationProperties-functionality of Spring to load my configuration properties via YAML into a Java class.

通常我会以某种方式使用它，即我有以下 yaml 文件:

Normally I would use it in a way, that I have the following yaml-file:

lst:
  typ:
    A: "FLT"
    B: "123"
    C: "345"
    D: "TTS"

type-attribute 将被映射到 Java-Map.现在我想有一个解决方案来引用 yaml 文件本身中的 yaml-fragments，以便我可以重用对片段的引用:

The type-attribute would be mapped to a Java-Map. Now i would like to have a solution to reference yaml-fragments in the yaml-file itself, so that I could reuse the reference to the fragment:

lst: ${typs}

typs:
  A: "FLT"
  B: "123"
  C: "345"
  D: "TTS" 

使用 Spring 和 @ConfigurationProperties 可以吗?

Is that possible with Spring and @ConfigurationProperties?

推荐答案

我相信只能使用带有字符串属性的占位符.这给您留下了 2 个选择:

I believe it is only possible to use placeholder with string properties. This leaves you with 2 options:

• 重复这些值；
• OR 将地图定义为属性字符串(来源:https://stackoverflow.com/a/28370899/641627).

• repeat the values;
• OR define the map as a String of properties (source: https://stackoverflow.com/a/28370899/641627).

如果您单击上面的链接，则会提供完整的说明.我会带你完成它.

The whole explanation is provided if you click on the link above. I'll walk you through it.

prop1: A:FLT, B:123, C...
prop2: ${prop1}

(2) 定义一个字符串来映射转换器/拆分器(来自 @FedericoPeraltaSchaffner 的回答)

@Component("PropertySplitter")
public class PropertySplitter {
    public Map<String, String> map(String property) {
        return this.map(property, ",");
    }
    private Map<String, String> map(String property, String splitter) {
        return Splitter.on(splitter).omitEmptyStrings().trimResults().withKeyValueSeparator(":").split(property);
    }
}

(3) 使用@Value 和splitter 注入地图:

@Value("#{PropertySplitter.map('${prop1}')}")
Map<String, String> prop1;

@Value("#{PropertySplitter.map('${prop2}')}")
Map<String, String> prop2;

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