如何使用snakeYaml库访问YAML文件中的内部(嵌套)键值 [英] How to Access the inner(nested) key-value in an YAML file using snakeYaml Library
问题描述
我正在尝试使用Java中的snakeYaml库读取config.yaml文件.
I am trying to read config.yaml file using the snakeYaml library in java.
我可以在我的配置文件中获取模块名称(即[{ABC=true}, {PQR=false}]
).
有没有办法我可以使用代码直接读取ABC的值(即true).
I am able to get the Module name (i.e [{ABC=true}, {PQR=false}]
) in my config file.
Is there a way where I can directly read the value of ABC (ie true) using the code.
我尝试过在线搜索,但它们并不是我要找的东西. 下面提到的几个链接:
I have tried to search online but they are not exactly what I am looking for. Few links that I went through mentioned below:
使用snakeyaml将.yml文件加载到哈希图中(导入junit库)
https://www.java-success. com/yaml-java-using-snakeyaml-library-tutorial/
config.yaml 数据:
config.yaml data:
Browser: FIREFOX
Module Name:
- ABC: Yes
- PQR: No
下面是我正在使用的代码
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.Reader;
import java.util.Map;
import org.yaml.snakeyaml.Yaml;
public class YAMLDemo {
public static void main(String[] args) throws FileNotFoundException {
Yaml yaml = new Yaml();
Reader yamlFile = new FileReader("./config.yaml");
Map<String , Object> yamlMaps = yaml.load(yamlFile);
System.out.println(yamlMaps.get("Browser"));
System.out.println(yamlMaps.get("Module Name"));
}
}
控制台输出:
FIREFOX
[{ABC=true}, {PQR=false}]
我们非常感谢您的帮助.预先感谢.
Any help is really appreciated. Thanks in advance.
推荐答案
如果使用调试器浏览代码,则可以看到module_name
被反序列化为ArrayList<LinkedHashMap<String, Object>>
:
If you step through the code with a debugger, you can see that module_name
is deserialised as an ArrayList<LinkedHashMap<String, Object>>
:
您只需要将其强制转换为正确的类型即可
You just need to cast it to the correct type:
public static void main(String[] args) throws FileNotFoundException {
Yaml yaml = new Yaml();
Reader yamlFile = new FileReader("./config.yaml");
Map<String , Object> yamlMaps = (Map<String, Object>) yaml.load(yamlFile);
System.out.println(yamlMaps.get("Browser"));
final List<Map<String, Object>> module_name = (List<Map<String, Object>>) yamlMaps.get("Module Name");
System.out.println(module_name);
System.out.println(module_name.get(0).get("ABC"));
System.out.println(module_name.get(1).get("PQR"));
}
这篇关于如何使用snakeYaml库访问YAML文件中的内部(嵌套)键值的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!