Java打印XML结构、属性

得到XML文档

   public static Element getRoot(Path path) throws ParserConfigurationException, IOException, SAXException {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document document = builder.parse(path.toFile());
        Element root = document.getDocumentElement();
        return root;
    }

    public static Element getRootIgnoring(Path path) throws ParserConfigurationException, IOException, SAXException {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        // 验证xml
        factory.setValidating(true);
        // 忽略xml中的空白
        factory.setIgnoringElementContentWhitespace(true);
        // 忽略注释
        factory.setIgnoringComments(true);
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document document = builder.parse(path.toFile());
        Element root = document.getDocumentElement();
        return root;
    }

    public static void xmlNodeToString(Element node) {
        System.out.println("<?xml version=\"1.0\" encoding=\"UTF-8\" ?>");
        printXml(node);
    }

    public static void printXml(Element node) {
        System.out.print(String.format("%s%s%s%s%s", tier(countParent(node)),
                "<", node.getTagName(), getAttrsStr(node), ">"));
        boolean leaf = isLeaf(node);
        if (leaf) {
            System.out.print(node.getTextContent());
        } else {
            System.out.println();
            for (Node n = node.getFirstChild(); n != null; n = n.getNextSibling()) {
                if (n instanceof Element) {
                    printXml((Element) n);
                }
            }
        }
        if (leaf) {
            System.out.println(String.format("%s%s%s", "</", node.getTagName(), ">"));
        } else {
            System.out.println(String.format("%s%s%s%s", tier(countParent(node)), "</", node.getTagName(), ">"));
        }
    }

    /**
     * 拼接层级
     */
    public static String tier(int count) {
        if (count == 0) {
            return "";
        }
        StringBuilder sbr = new StringBuilder();
        for (int i = 1; i < count; i++) {
            sbr.append(" ");
        }
        return sbr.toString();
    }

    /**
     * 拼接属性
     */
    public static String getAttrsStr(Node node) {
        NamedNodeMap attrs = node.getAttributes();
        if (attrs.getLength() == 0) {
            return "";
        }
        StringBuilder sbr = new StringBuilder();
        for (int i = 0; i < attrs.getLength(); i++) {
            Node attr = attrs.item(i);
            if (i == 0 || i < attrs.getLength()) {
                sbr.append(" ");
            }
            sbr.append(attr.getNodeName()).append("=").append("\"").append(attr.getNodeValue()).append("\"");
        }
        return sbr.toString();
    }


    /**
     * 子节点数量
     *
     * @param node
     * @return
     */
    public static int countChild(Node node) {
        int count = 0;
        NodeList nodeList = node.getChildNodes();
        for (int i = 0; i < nodeList.getLength(); i++) {
            if (nodeList.item(i) instanceof Element) {
                count++;
            }
        }
        return count;
    }

    /**
     * 获取父级数量
     */
    public static int countParent(Node node) {
        int count = 0;
        if (node.getParentNode() != null) {
            count++;
            count += countParent(node.getParentNode());
        }
        return count;
    }

    /**
     * 是否子节点
     *
     * @param node
     * @return
     */
    public static boolean isLeaf(Node node) {
        return countChild(node) == 0;
    }