【地图功能开发系列：二】根据地址名称通过百度地图API查询出坐标

根据地址名称通过百度地图API查询出坐标

百度地图ApiUrl

string url = "http://api.map.baidu.com/geocoder?address={0}&output=json&key=这里用自己申请的key"

    //查询出门店列表
    string sql = "select shopid, shopName,shopadress, lat ,lng as lon from Shop";
        //单个门店的情况
        if (shopid!=0)
        {
            sql += " where shopid=" + shopid;
        }

        DataTable PlaceDt = kis_web.DBHelper.GetTable(sql);
        foreach (DataRow row in PlaceDt.Rows)
        {
          //请求
            var request = (HttpWebRequest)WebRequest.Create(string.Format(url, row["shopadress"]));
            var response = (HttpWebResponse)request.GetResponse();
            var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
            //请求结果
            JObject jo = (JObject)JsonConvert.DeserializeObject(responseString);
            //有些地址是查询不出来result的,因此要做个判断
            if (string.Equals(jo["status"].ToString(), "OK") && jo["result"].ToString() != "[]")
            {
                string lat = jo["result"]["location"]["lat"].ToString();
                string lng = jo["result"]["location"]["lng"].ToString();
                //修改数据库中的门店坐标地址
                string updateSql = "UPDATE Shop SET lat = '{0}',lng = '{1}' WHERE shopid ='{2}'";
                int result = kis_web.DBHelper.ExeSQLs(string.Format(updateSql, lat, lng, row["shopid"]));
               
            }
        }

测试DEMO可以直接赋值使用

        string url = "http://api.map.baidu.com/geocoder?address={0}&output=json&key=key";
        var request = (HttpWebRequest)WebRequest.Create(string.Format(url, "广州"));
        var response = (HttpWebResponse)request.GetResponse();
        var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
        JObject jo = (JObject)JsonConvert.DeserializeObject(responseString);
        string lng = jo["result"]["location"]["lng"].ToString();
        string lat = jo["result"]["location"]["lat"].ToString();
        Response.Write(lng + "|" + lat);

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相关命名空间

using Newtonsoft.Json;
using System.Net;
using Newtonsoft.Json.Linq;

通过上诉的操作，这样就可以将数据库中拥有地址的门店赋值坐标