ip获取和淘宝api解析ip问题

使用淘宝api，根据ip获取所在地等，
错误信息
net.sf.json.JSONException: A JSONObject text must begin with '{' at character 0 of
at net.sf.json.util.JSONTokener.syntaxError(JSONTokener.java:499)
at com.eypg.util.IPUtil.getInfoByIp(IPUtil.java:105)

      try {
        Proxy httproxy = (Proxy)ApplicationContextListener.context.getBean(Proxy.class);
        String result = httproxy.get("http://ip.taobao.com/service/getIpInfo.php?ip=" + ip, null);
        JSONObject obj = JSONObject.fromObject(result);  // 该行报错
        if (obj.getInt("code") == 0) {
         ......
        }
      }
      catch (HttpException localHttpException) {
      }

获取ip的方法如下：

 public static String getIpAddr(HttpServletRequest request)
  {
    String ip = request.getHeader("x-forwarded-for");
    if ((ip == null) || (ip.length() == 0) || ("unknown".equalsIgnoreCase(ip))) {
      ip = request.getHeader("Proxy-Client-IP");
    }
    if ((ip == null) || (ip.length() == 0) || ("unknown".equalsIgnoreCase(ip))) {
      ip = request.getHeader("WL-Proxy-Client-IP");
    }
    if ((ip == null) || (ip.length() == 0) || ("unknown".equalsIgnoreCase(ip))) {
      ip = request.getRemoteAddr();
    }
    if (ip.equals("0:0:0:0:0:0:0:1")) {
      ip = "本地";
    }
    if (ip.split(",").length > 1) {
      ip = ip.split(",")[0];
    }
    return ip;
  }

result是不是合法的json数据，它是不是{}包括的，有没有别的字符？