使用百度定位Api获取当前用户登录地址

　　　　　　　　　　String url = request.getRemoteAddr();
                // url = "58.56.23.118";   //本地代码测试ip,使用本地公网
                // 这里调用百度的ip定位api服务 详见 ak需要申请
                // http://api.map.baidu.com/lbsapi/cloud/ip-location-api.htm
                org.json.JSONObject json = readJsonFromUrl("http://api.map.baidu.com/location/ip?ak=马赛克部分&ip="
                        + url);
                // json.get("content")).get("address"));
                // status状态为2,表示没有获取到地区信息
                if ((Integer) json.get("status") != 2) {
                    /*
                     * Object adress = ((org.json.JSONObject)
                     * json.get("content")) .get("address");
                     */
                    // "address_detail":{"province":"山东省","city":"济南市","street":"","district":"","street_number":"","city_code":288},"address":"山东省济南市","
                    Object adress = null;                
                    if(json.get("content") != null && ((org.json.JSONObject)json.get("content")).get("address_detail") != null)
                    {
                        adress = ((JSONObject) ((org.json.JSONObject) json
                                .get("content")).get("address_detail")).get("city");
                        String areaName = (String) adress;  //获取到市级城市名称
                        //request.getSession().setAttribute("area_name", areaName);
                        Map params = new HashMap();
                        params.put("areaName", areaName);
                        List areas = this.areaService
                                .query("select obj from Area obj where obj.areaName=:areaName",
                                        params, -1, -1);

                        if (areas.size() > 0 && areas != null) {
                            Area area = areas.get(0);
                            area_id = area.getId().longValue();
                            request.getSession().setAttribute("area_id", area_id);
                            request.getSession()
                                    .setAttribute("area_name", areaName);
                            mv.addObject("area_id", area_id);
                            mv.addObject("adress", adress);
                        }
                    }                    
                    else
                    {
                        //mv.addObject("adress", "中国大区");
                        area_id = null;
                        request.getSession().setAttribute("area_name", "中国大区");
                    }

public static org.json.JSONObject readJsonFromUrl(String url)
            throws IOException, JSONException {
        InputStream is = new URL(url).openStream();
        try {
            BufferedReader rd = new BufferedReader(new InputStreamReader(is,
                    Charset.forName("UTF-8")));
            String jsonText = readAll(rd);
            org.json.JSONObject json = new org.json.JSONObject(jsonText);
            return json;
        } finally {
            is.close();
            // System.out.println("同时 从这里也能看出 即便return了，仍然会执行finally的！");
        }
    }