Java怎么把XML转换成嵌套的Map结构

public static Map xmlToMap(String xml) throws Exception {
    Document doc = DocumentBuilderFactory.newInstance()
        .newDocumentBuilder().parse(new ByteArrayInputStream(xml.getBytes()));
    return nodeToMap(doc.getDocumentElement());
}

private static Map nodeToMap(Node node) {
    Map result = new LinkedHashMap<>();
    // 处理属性
    if (node.getAttributes() != null) {
        Map attrs = new LinkedHashMap<>();
        for (int i = 0; i < node.getAttributes().getLength(); i++) {
            Node attr = node.getAttributes().item(i);
            attrs.put(attr.getNodeName(), attr.getNodeValue());
        }
        if (!attrs.isEmpty()) result.put("@attributes", attrs);
    }

    NodeList children = node.getChildNodes();
    Map>> childGroups = new LinkedHashMap<>();

    for (int i = 0; i < children.getLength(); i++) {
        Node child = children.item(i);
        if (child.getNodeType() == Node.ELEMENT_NODE) {
            String name = child.getNodeName();
            childGroups.computeIfAbsent(name, k -> new ArrayList<>())
                       .add(nodeToMap(child));
        } else if (child.getNodeType() == Node.TEXT_NODE) {
            String text = child.getTextContent().trim();
            if (!text.isEmpty()) {
                result.put("#text", text);
            }
        }
    }

    // 拆分group：单个→Map，多个→List