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所属分类：.NET技术
个人认为百度地图开放平台确实很好用但就是C#的SN校验会出现以下几个问题
一、官方的示例代码说的不清不楚
获取SN函数的Uri应该使用不带域名的Uri
比如：最终请求地址为https://api.map.baidu.com/location/ip?ip=119.126.10.15&coor=gcj02&ak=123456&sn=654321时
AKSNCaculater.CaculateAKSN中的uri参数应该使用https://api.map.baidu.com/location/ip?ip=119.126.10.15&coor=gcj02&ak=123456&sn=654321，而不可以是https://aspi.map.baidu.com/location/ip?coor=gcj02&ip=119.126.10.15&ak=123456&sn=654321
获取SN的时候参数的顺序是怎么样的，发送请求的时候参数的顺序就必须是怎么样
比如：获取SN的时候参数顺序是ip=119.126.10.15&coor=gcj02&ak=123456，那么最终请求地址就应该是https://api.map.baidu.com/location/ip?ip=119.126.10.15&coor=gcj02&ak=123456&sn=654321，而不可以是https://aspi.map.baidu.com/location/ip?coor=gcj02&ip=119.126.10.15&ak=123456&sn=654321
无论如何SN必须在最终请求地址的最后！
比如以上情况下：https://api.map.baidu.com/location/ip?ip=119.126.10.15&coor=gcj02&sn=654321&ak=123456就是一个错误的地址
二、官方MD5加密是错的！
这一个真是把我害惨了，折腾了半天终于发现正确代码（我也是copy别人的，但不管怎么说，官方的MD5加密代码确实是错的）
正确的加密过程如下
public static string MD52(string password) { try { System.Security.Cryptography.HashAlgorithm hash = System.Security.Cryptography.MD5.Create(); byte[] hash_out = hash.ComputeHash(System.Text.Encoding.UTF8.GetBytes(password)); var md5_str = BitConverter.ToString(hash_out).Replace("-", ""); return md5_str.ToLower(); } catch { throw; } }
完整类如下：
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace SATPlatform { public class AKSNCaculater { public static string MD52(string password) { try { System.Security.Cryptography.HashAlgorithm hash = System.Security.Cryptography.MD5.Create(); byte[] hash_out = hash.ComputeHash(System.Text.Encoding.UTF8.GetBytes(password)); var md5_str = BitConverter.ToString(hash_out).Replace("-", ""); return md5_str.ToLower(); } catch { throw; } } public static string MD5(string password) { byte[] textBytes = System.Text.Encoding.UTF8.GetBytes(password); try { System.Security.Cryptography.MD5CryptoServiceProvider cryptHandler; cryptHandler = new System.Security.Cryptography.MD5CryptoServiceProvider(); byte[] hash = cryptHandler.ComputeHash(textBytes); string ret = ""; foreach (byte a in hash) { ret += a.ToString("x"); } return ret; } catch { throw; } } public static string UrlEncode(string str) { str = System.Web.HttpUtility.UrlEncode(str); byte[] buf = Encoding.ASCII.GetBytes(str);//等同于Encoding.ASCII.GetBytes(str) for (int i = 0; i < buf.Length; i++) if (buf[i] == '%') { if (buf[i + 1] >= 'a') buf[i + 1] -= 32; if (buf[i + 2] >= 'a') buf[i + 2] -= 32; i += 2; } return Encoding.ASCII.GetString(buf);//同上，等同于Encoding.ASCII.GetString(buf) } public static string HttpBuildQuery(IDictionary<string, string> querystring_arrays) { StringBuilder sb = new StringBuilder(); foreach (var item in querystring_arrays) { sb.Append(UrlEncode(item.Key)); sb.Append("="); sb.Append(UrlEncode(item.Value)); sb.Append("&"); } sb.Remove(sb.Length - 1, 1); return sb.ToString(); } public static string CaculateAKSN(string ak, string sk, string url, IDictionary<string, string> querystring_arrays) { var queryString = HttpBuildQuery(querystring_arrays); var str = UrlEncode(url + "?" + queryString + sk); return MD52(str); } } }
以上就是我被坑的经历，希望对其他人有用~~~
最后再附带上我的请求代码
/// <summary> /// 返回指定IP的位置对应的百度城市代码（利用百度地图API /// </summary> /// <param name="IP">需要查询的IP地址</param> /// <returns></returns> public string GetPlace(string IP) { DataTable BasicIn = Reader("SELECT Th_MapAK , Th_MapSK FROM S_Inf"); Dictionary<string, string> P = new Dictionary<string, string>() { {"ip",IP }, {"coor","gcj02" }, {"ak",BasicIn.Rows[0]["Th_MapAK"].ToString() } //{"address","百度大厦" }, //{"output","json" }, //{"ak","yourak" } }; string GetSN = AKSNCaculater.CaculateAKSN(BasicIn.Rows[0]["Th_MapAK"].ToString(), BasicIn.Rows[0]["Th_MapSK"].ToString(), "/location/ip", P); //string GetSN = AKSNCaculater.CaculateAKSN("yourak", "yoursk", "/geocoder/v2/", P); HttpWebRequest NewRequest = (HttpWebRequest)WebRequest.Create("https://api.map.baidu.com/location/ip?" + AKSNCaculater.HttpBuildQuery(P) + "&sn=" + GetSN); NewRequest.Headers.Add("charset", "utf-8"); NewRequest.Method = "GET"; NewRequest.ContentType = "application/json"; NewRequest.UserAgent = "Windows KeHuDuan"; NewRequest.Timeout = 5000;//设置超时时间 HttpWebResponse Response = (HttpWebResponse)NewRequest.GetResponse(); Stream ResponseStream = Response.GetResponseStream(); StreamReader ResponseStreamReader = new StreamReader(ResponseStream); string Res = ResponseStreamReader.ReadToEnd(); ResponseStreamReader.Close(); ResponseStream.Close(); JObject ResJ = new JObject(); try { ResJ = JObject.Parse(Res); } catch (Exception) { GiveErr(ErrCode.ThirdPartyError); } if (ResJ["status"].ToString() != "0") GiveErr(ErrCode.ThirdPartyError); return ResJ["content"]["address_detail"]["city_code"].ToString(); }
