java xml 转 map / map 转 xml

    /**
     * map转xml map中没有根节点的键
     * 
     * @param map
     * @param rootName
     * @return
     */
    public static Document map2xml(Map<String, Object> map, String rootName) {
        Document doc = DocumentHelper.createDocument();// 创建一个Document对象
        Element root = DocumentHelper.createElement(rootName); // 创建根节点
        doc.add(root);
        map2xml(map, root);
        return doc;
    }

    /**
     * map转xml
     * 
     * @param map
     * @param body
     * @return
     */
    @SuppressWarnings({ "rawtypes", "unchecked" })
    private static Element map2xml(Map<String, Object> map, Element body) {
        Set<Entry<String, Object>> entries = map.entrySet();
        for (Entry<String, Object> entry : entries) {
            String key = entry.getKey();
            Object value = entry.getValue();
            if (key.startsWith("@")) {// 属性
                body.addAttribute(key.substring(1, key.length()), value.toString());
            } else if (key.equals("#text")) { // 有属性时的文本
                body.setText(value.toString());
            } else {
                if (value instanceof java.util.List) {
                    List list = (List) value;
                    Object obj;
                    for (int i = 0; i < list.size(); i++) {
                        obj = list.get(i);
                        // list里是map或String，不会存在list里直接是list的
                        if (obj instanceof java.util.Map) {
                            Element subElement = body.addElement(key);
                            map2xml((Map) list.get(i), subElement);
                        } else {
                            body.addElement(key).setText((String) list.get(i));
                        }
                    }
                } else if (value instanceof java.util.Map) {
                    Element subElement = body.addElement(key);
                    map2xml((Map) value, subElement);
                } else {
                    body.addElement(key).setText(value.toString());
                }
            }
        }
        return body;
    }

    /**
     * 格式化输出xml
     * 
     * @param document
     * @return
     * @throws DocumentException
     * @throws IOException
     */
    public static String formatXml(Document document) throws DocumentException, IOException {
        // 格式化输出格式
        OutputFormat format = OutputFormat.createPrettyPrint();
        // format.setEncoding("UTF-8");
        StringWriter writer = new StringWriter();
        // 格式化输出流
        XMLWriter xmlWriter = new XMLWriter(writer, format);
        // 将document写入到输出流
        xmlWriter.write(document);
        xmlWriter.close();
        return writer.toString();
    }

参照：原博客