Java 如何在 YAML 文件中为简单的 POJO 定义映射？
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How to define a map in a YAML file for simple POJO?
提问by frugalcoder
I am using snakeYaml to parse certain configuration/property values to a Configuration object.
我正在使用 snakeYaml 将某些配置/属性值解析为 Configuration 对象。
My yaml file looks like this -
我的 yaml 文件看起来像这样 -
#Thread
batchLimit: 1000
threadCountLimit: 2
#Some More Config
key: value
#MAP
keyMapping: <What goes here?>
My Configuration class looks like this -
我的配置类看起来像这样 -
public class Configuration{
int batchlimit;
int threadCountLimit;
...
Map<String,String> keyMapping;
}
How do I define the keyMappingin the YAML file so it reads directly through SnakeYAML?
如何keyMapping在 YAML 文件中定义以便它直接通过 SnakeYAML 读取？
采纳答案by AlexR
Here is how it can look like:
这是它的样子：
#MAP
keyMapping:
key1: value1
key2: value2
Generally YAML format has natural support of key-value pairs. Take a look on the following tutorial (just for example): https://github.com/Animosity/CraftIRC/wiki/Complete-idiot's-introduction-to-yaml
通常 YAML 格式自然支持键值对。看看下面的教程（只是举例）：https: //github.com/Animosity/CraftIRC/wiki/Complete-idiot's-introduction-to-yaml
Or just google "yaml map" for more details.
或者只是谷歌“yaml map”了解更多详情。
回答by Māris Rubenis
Yaml file "AppParams.yml" with key-value pairs:
带有键值对的 Yaml 文件“AppParams.yml”：
someConfig:
key1: value1
key2: value2
POJO:
POJO：
public class ApplicationParameters {
private Map<String, String> someConfig;
public ApplicationParameters() {
}
public Map<String, String> getSomeConfig() {
return someConfig;
}
public void setSomeConfig(Map<String, String> someConfig) {
this.someConfig = someConfig;
}
}
Reader:
读者：
ObjectMapper mapper = new ObjectMapper(new YAMLFactory());
File paramFile = new File("AppParams.yml");
ApplicationParameters applicationParameters = mapper.readValue(paramFile, ApplicationParameters.class);
Map<String, String> someConfig = applicationParameters.getSomeConfig();
String key1Value = someConfig.get("key1"); //returns "value1"
The example above uses these dependencies in POM.xml:
上面的示例在 POM.xml 中使用了这些依赖项：
<dependencies>
<dependency>
<groupId>com.fasterxml.Hymanson.core</groupId>
<artifactId>Hymanson-core</artifactId>
<version>2.9.8</version>
</dependency>
<dependency>
<groupId>com.fasterxml.Hymanson.core</groupId>
<artifactId>Hymanson-databind</artifactId>
<version>2.9.8</version>
</dependency>
<dependency>
<groupId>com.fasterxml.Hymanson.dataformat</groupId>
<artifactId>Hymanson-dataformat-yaml</artifactId>
<version>2.9.8</version>
</dependency>
</dependencies>
