java map转xml

 public static String map2XML(Map map) {
        Set<String> keys = map.keySet();
        StringBuffer sb = new StringBuffer();//创建字符串

        for (String key : keys) {
            sb.append("<" + key + ">");
            sb.append(map.get(key) == null ? "" : map.get(key));
            sb.append("</" + key + ">");
        }
        return sb.toString();
    }
    ```