如何使用SnakeYaml对YAML中的节点进行排序？

xml<dependency>
    <groupId>org.yaml</groupId>
    <artifactId>snakeyaml</artifactId>
    <version>2.0</version> <!-- 请使用最新版本 -->
</dependency>

javaimport org.yaml.snakeyaml.Yaml;

import java.io.InputStream;
import java.util.Map;

public class YamlSorter {
    public static void main(String[] args) {
        Yaml yaml = new Yaml();
        try (InputStream inputStream = YamlSorter.class
                .getClassLoader()
                .getResourceAsStream("example.yaml")) {
            Map<String, Object> obj = yaml.load(inputStream);
            // 处理排序
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

javaimport java.util.Map;
import java.util.TreeMap;

// ...

Map<String, Object> sortedMap = new TreeMap<>(obj);

javaimport org.yaml.snakeyaml.Yaml;

import java.io.InputStream;
import java.util.*;

public class YamlSorter {
    public static void main(String[] args) {
        Yaml yaml = new Yaml();
        try (InputStream inputStream = YamlSorter.class
                .getClassLoader()
                .getResourceAsStream("example.yaml")) {
            Map<String, Object> obj = yaml.load(inputStream);
            Map<String, Object> sortedObj = sortMap(obj);
            // 输出排序后的 YAML
            System.out.println(dump(sortedObj));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    // 递归排序所有 Map
    @SuppressWarnings("unchecked")
    public static Map<String, Object> sortMap(Map<String, Object> map) {
        Map<String, Object> sorted = new TreeMap<>();
        for (Map.Entry<String, Object> entry : map.entrySet()) {
            String key = entry.getKey();
            Object value = entry.getValue();
            if (value instanceof Map) {
                value = sortMap((Map<String, Object>) value);
            } else if (value instanceof List) {
                value = sortList((List<Object>) value);
            }
            sorted.put(key, value);
        }
        return sorted;
    }

    // 如果列表中的元素是 Map，也需要排序
    @SuppressWarnings("unchecked")
    public static List<Object> sortList(List<Object> list) {
        List<Object> sortedList = new ArrayList<>();
        for (Object item : list) {
            if (item instanceof Map) {
                sortedList.add(sortMap((Map<String, Object>) item));
            } else if (item instanceof List) {
                sortedList.add(sortList((List<Object>) item));
            } else {
                sortedList.add(item);
            }
        }
        // 如果需要对列表进行排序，可以根据具体需求实现
        return sortedList;
    }

    // 将排序后的 Map 转换回 YAML 字符串
    public static String dump(Map<String, Object> map) {
        Yaml yaml = new Yaml();
        return yaml.dump(map);
    }
}

javaimport java.io.FileWriter;
import java.io.IOException;

// 在 main 方法中替换 System.out.println 为以下代码：
try (FileWriter writer = new FileWriter("sorted_example.yaml")) {
    yaml.dump(sortedObj, writer);
} catch (IOException e) {
    e.printStackTrace();
}

yamlb:
  d: 4
  c: 3
a:
  z: 26
  y: 25

yamla:
  y: 25
  z: 26
b:
  c: 3
  d: 4