public void responseJason(HttpServletResponse response, Object obj){

        ObjectMapper objectMapper = new ObjectMapper();

        ByteArrayOutputStream baos = new ByteArrayOutputStream();// 向OutPutStream中写入

        try {

            objectMapper.writeValue(baos, obj);// 对象写入json

        } catch (IOException e) {

            e.printStackTrace();

        }

        response.setContentType("application/json; charset=utf-8");

        try {

            response.getWriter().write(baos.toString());

            response.getWriter().flush();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

public String getRegionByIP(String ip){

        String url = "http://ip.taobao.com/service/getIpInfo.php?ip="+ip;

        HttpClient httpClient = new DefaultHttpClient();

        HttpPost httpost = new HttpPost(url);

        String returnRegion = "";

        try {

            HttpResponse response = httpClient.execute(httpost);

            HttpEntity httpEntity = response.getEntity();

            String responseString = EntityUtils.toString(httpEntity);

            ObjectMapper objectMapper = new ObjectMapper();

            Map map = objectMapper.readValue(responseString, Map.class);

            Map dataMap = (Map) map.get("data");

            String region = dataMap.get("region").toString();

            String city = dataMap.get("city").toString();

            returnRegion = region+","+city;

        } catch (ClientProtocolException e) {

            logger.info("用IP: "+ip+" 取省市出错！");

        } catch (IOException e) {

//            ipFlag = false;

            logger.info("用IP: "+ip+" 取省市出错！");

        } catch (Exception e) {

//            ipFlag = false;

            logger.info("用IP: "+ip+" 取省市出错！");

        }

        return returnRegion;

    }