获取百度地图POI数据三（模拟关键词搜索）

上一篇博文中讲到如何获取用于搜索的关键词，并且已经准备好了一百五十万的关键词   这其中有门牌号码，餐馆酒店名称，公司名称，道路名称等。有了这些数据，我们就可以通过代码，模拟我们在百度地图的搜索框中搜索地点，从而获取其返回的POI数据。下面直接上代码~

一 、准备好用于存储数据的数据库表

　　

由于百度返回的POI数据都是JSON字符串且子节点非常多，为了按照子节点一一存储，就需要建这么一张包含很多字段的表，虽然麻烦，但是信息很全面。当然各位也可以选择性的存储其中的数据。

　　二、获取并解析数据的代码

class Program
    {
        static string[] strArr = { "name", "addr", "address_norm", "alias", "aoi", "area_name", "brand_id", "cla", "di_tag", "ext_display", "geo", "indoor_pano", "navi_update_time", "new_catalog_id", "primary_uid", "show_tag", "std_tag", "storage_src", "street_id", "tag", "tel", "uid" };
        static string[] flaArr = { "navi_x", "navi_y" };
        static string[] intArr = { "acc_flag", "area", "biz_type", "catalogID", "click_flag", "detail", "diPointX", "diPointY", "dis", "dist2route", "dist2start", "ext_type", "f_flag", "father_son", "flag_type", "geo_type", "ismodified", "pano", "poiType", "poi_click_num", "poi_profile", "prio_flag", "route_flag", "status", "ty", "view_type", "x", "y" };
        static List<string> tempList = new List<string>();
        static void Main(string[] args)
        {
　　　　　　　//调用SQLHelper类中的方法
            DataTable kwDt = SQLHelper.ExecuteDataTable("select KWName from SHKW order by SaveTime", CommandType.Text);
            List<string> kwList = new List<string>();
            foreach (DataRow row in kwDt.Rows)
            {
                kwList.Add(row["KWName"].ToString());
            }
            int total = kwList.Count;
            DataTable tempDt = SQLHelper.ExecuteDataTable("select name,addr from SHPOI", CommandType.Text);
            foreach (DataRow row in tempDt.Rows)
            {
                tempList.Add(row["name"].ToString() + "," + row["addr"].ToString());
            }
            for (int i = ; i < kwList.Count; i++)
            {
                string kw = kwList[i];
                string keyWord = "上海市" + kw;
                for (int j = ; j < ; j++)
                {
                    string url = "http://map.baidu.com/?newmap=1&reqflag=pcmap&biz=1&from=webmap&da_par=direct&pcevaname=pc4.1&qt=s&da_src=searchBox.button&wd=" + keyWord + "&c=289&pn=" + j;
                    int count = DownloadPOIInfoFromBMap(url, -, keyWord + j);
                    if (count == -) break;
                    Console.WriteLine("成功写入数据：" + count + "条  执行次数：" + (j + ) + "  KeyWord：" + keyWord + " kwNum：" + (kwList.IndexOf(kw) + ) + " tatal:" + total);
                }
            }
            Console.WriteLine("ok");
            Console.ReadKey();
        }
        private static int DownloadPOIInfoFromBMap(string url, int typeId, string fileName)
        {
            int count = ;
            Stream responseStream;
            string restring;
            try
            {
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
                request.Method = "GET";
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                responseStream = response.GetResponseStream();
                StreamReader sr = new StreamReader(responseStream, Encoding.Default);
                restring = sr.ReadToEnd();
            }
            catch
            {
                Console.WriteLine("网络异常");
                return count;
            }
            string[] strArr = restring.Split(new string[] { "\\u" }, StringSplitOptions.None);
            StringBuilder sb = new StringBuilder();
            sb.Append(strArr[]);
            try
            {
                for (int i = ; i < strArr.Length; i++)
                {
                    string code = strArr[i];
                    int value = Convert.ToInt32(code.Substring(, ), );
                    sb.Append(char.ConvertFromUtf32(value));
                    if (code.Length > )
                    {
                        sb.Append(code.Substring(, code.Length - ));
                    }
 
                }
            }
            catch
            {
                return count;
            }
            JObject jo;
            try
            {
                jo = (JObject)JsonConvert.DeserializeObject(sb.ToString());
            }
            catch
            {
　　　　　　　　　//一些数据无法正确转换为json对象  需要特别处理
                Regex regex = new Regex("\"\\{\\\\\"index_tag\\\\\".*?\"\\}\"");
                //MatchCollection collection = regex.Matches(sb.ToString());
                string data = sb.ToString();
                data = regex.Replace(data, "\"\"");
                try
                {
                    jo = (JObject)JsonConvert.DeserializeObject(data);
                }
                catch
                {
                    Regex regex1 = new Regex("\"\\{\\\\\"shop_id\\\\\".*?\"\\}\"");
                    data = regex1.Replace(data, "\"\"");
                    try
                    {
                        jo = (JObject)JsonConvert.DeserializeObject(data);
                    }
                    catch
                    {
                        try
                        {
                            Console.Write("无法构建JSON对象 ");
                            File.WriteAllText(@"D:\errorData\" + fileName + ".txt", data);
                        }
                        catch { }
                        return count;
                    }
                }
            }
            return SavePOIToDB(jo, typeId);
        }
 
        private static int SavePOIToDB(JObject jo, int typeId)
        {
            int count = ;
            try
            {
                if (jo["content"].Children().Count() == ) return -;
            }
            catch
            {
                if (jo != null) return -;
 
            }
            foreach (JToken child in jo["content"].Children())
            {
                List<SqlParameter> listParam = new List<SqlParameter>();
                foreach (string s in strArr)
                {
                    listParam.Add(new SqlParameter(@s, GetInfoString(s, child)));
                }
                foreach (string f in flaArr)
                {
                    listParam.Add(new SqlParameter(@f, GetInfoString(f, child)));
                }
                foreach (string i in intArr)
                {
                    listParam.Add(new SqlParameter(@i, GetInfoString(i, child)));
                }
                List<float> coordinate = ConvertCoor(GetInfoInt("x", child), GetInfoInt("y", child));
                listParam.Add(new SqlParameter(@"TypeId", typeId));
                listParam.Add(new SqlParameter(@"lot_bdll", coordinate[]));
                listParam.Add(new SqlParameter(@"lat_bdll", coordinate[]));
                string tempStr = GetInfoString("name", child).Replace("'", "") + "," + GetInfoString("addr", child);
                if (tempList.Contains(tempStr)) continue;
                tempList.Add(tempStr);
                string sql = "insert into SHPOI values(@Name,@acc_flag,@addr,@address_norm,@alias,@aoi,@area,@area_name,@biz_type,@brand_id,@catalogID,@cla,@click_flag,@detail,@diPointX,@diPointY,@di_tag,@dis,@dist2route,@dist2start,@ext_display,@ext_type,@f_flag,@father_son,@flag_type,@geo,@geo_type,@indoor_pano,@ismodified,@navi_update_time,@navi_x,@navi_y,@new_catalog_id,@pano,@poiType,@poi_click_num,@poi_profile,@primary_uid,@prio_flag,@route_flag,@show_tag,@status,@std_tag,@storage_src,@street_id,@tag,@tel,@ty,@uid,@view_type,@x,@y,@lot_bdll,@lat_bdll,@TypeId)";
                SQLHelper.ExecuteNonQuery(sql, CommandType.Text, listParam.ToArray());
                count++;
            }
            return count;
        }
        private static int GetInfoInt(string key, JToken jo)
        {
            try
            {
                return Convert.ToInt32(jo[key].ToString());
            }
            catch
            {
                return ;
            }
        }
 
        private static float GetInfoFloat(string key, JToken jo)
        {
            try
            {
                return float.Parse(jo[key].ToString());
            }
            catch
            {
                return ;
            }
        }
        private static string GetInfoString(string key, JToken jo)
        {
            try
            {
                return jo[key].ToString();
            }
            catch
            {
                return DBNull.Value.ToString();
            }
        }
 
        /// <summary>
        /// 将bdmac坐标转换城bdll坐标
        /// </summary>
        /// <param name="x"></param>
        /// <param name="y"></param>
        /// <returns></returns>
        private static List<float> ConvertCoor(int x, int y)
        {
            //GevTfxGlAWxzIzTobk7PGX1eu2YF0RMl
            //ghCXsfOvpXwWsnm6lhWGelF5f0Fh3y82
            List<float> list = new List<float>();
            string url = "http://api.map.baidu.com/geoconv/v1/?coords=" + x / (100.0) + "," + y / (100.0) + "&from=6&to=5&ak=ghCXsfOvpXwWsnm6lhWGelF5f0Fh3y82";
            Stream responseStream;
            StreamReader sr;
            try
            {
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
                request.Method = "GET";
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                responseStream = response.GetResponseStream();
                sr = new StreamReader(responseStream, Encoding.Default);
            }
            catch
            {
                list.Add();
                list.Add();
                return list;
            }
            string restring = sr.ReadToEnd();
            JObject jo;
            try
            {
                jo = (JObject)JsonConvert.DeserializeObject(restring);
                list.Add(float.Parse(jo["result"][]["x"].ToString()));
                list.Add(float.Parse(jo["result"][]["y"].ToString()));
            }
            catch
            {
                list.Add();
                list.Add();
            }
            return list;
        }
    }

使用关键词模拟百度地图的搜索功能从而获取返回的POI数据的方法能够获取大量的POI数据  由于返回的数据中没有百度经纬度坐标信息，只有百度墨卡托的坐标，所以还需要调用它的API  通过坐标转换的方方法来获取百度经纬度坐标。这就需要申请开发密钥了，而且每个密钥一天最多只能进行十万次的坐标转换。

以下是本人获取的部分POI数据：

以上就是本人获取百度地图POI数据的方式，由于关键词数量在百万级别   而且百度每次返回的数据的页数也不近相同，多的有百页，少的仅有一条设置没有，所以程序需要运行很长的时间，本人运行两周程序也才获取到一百多万数据。预计程序运行完成时POI数据总量或与关键词总量相差无几，也能达到一百五十万左右，虽然并不知道百度地图上海地区的POI数据具体有多少，但是一百多万的数据量已经能够做些分析了。