如何用Java/Jackson解析YAML文件和管理$ref参考值

<dependency>
    <groupId>com.fasterxml.jackson.dataformat</groupId>
    <artifactId>jackson-dataformat-yaml</artifactId>
    <version>2.12.5</version>
</dependency>

# config.yaml
database:
  host: localhost
  port: 3306
  username: root
  password: password123

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;

import java.io.File;
import java.io.IOException;
import java.util.Map;

public class YAMLParser {
    public static void main(String[] args) {
        try {
            // 创建ObjectMapper对象，用于解析YAML文件
            ObjectMapper mapper = new ObjectMapper(new YAMLFactory());

            // 加载YAML文件并解析为Map对象
            Map<String, Object> yamlData = mapper.readValue(new File("config.yaml"), Map.class);

            // 获取和管理$ref参考值
            String host = (String) yamlData.get("database.host");
            int port = (int) yamlData.get("database.port");
            String username = (String) yamlData.get("database.username");
            String password = (String) yamlData.get("database.password");

            // 打印解析结果
            System.out.println("Host: " + host);
            System.out.println("Port: " + port);
            System.out.println("Username: " + username);
            System.out.println("Password: " + password);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}