【ASP.NET进阶】根据IP地址返回对应位置信息

        /// <summary>获取客户端IP地址（无视代理）</summary>        /// <returns>若失败则返回回送地址</returns>        public static string GetHostAddress()        {            string userHostAddress = HttpContext.Current.Request.UserHostAddress;            if (string.IsNullOrEmpty(userHostAddress))            {                userHostAddress = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];            }            //最后判断获取是否成功，并检查IP地址的格式（检查其格式非常重要）            if (!string.IsNullOrEmpty(userHostAddress) && IsIP(userHostAddress))            {                return userHostAddress;            }            return "127.0.0.1";        }        /// <summary>        /// 检查IP地址格式        /// </summary>        /// <param name="ip"></param>        /// <returns></returns>        public static bool IsIP(string ip)        {            return System.Text.RegularExPRessions.Regex.IsMatch(ip, @"^((2[0-4]/d|25[0-5]|[01]?/d/d?)/.){3}(2[0-4]/d|25[0-5]|[01]?/d/d?)$");        

        private const string THE_KEY = "***************"; //你的AK密钥        /// <summary>返回UTF-8编码服务地址</summary>        /// <returns>服务地址</returns>        public string GetPostUrl(string theIP)        {            string postUrl = "http://api.map.baidu.com/location/ip?ak=" + THE_KEY + "&ip=" + theIP + "&coor=bd09ll";            return postUrl;        }

        /// <summary> 返回结果（地址解析的结果） </summary>        public static string GetInfoByUrl(string url)        {            //调用时只需要把拼成的URL传给该函数即可。判断返回值即可            string strRet = null;            if (url == null || url.Trim().ToString() == "")            {                return strRet;            }            string targeturl = url.Trim().ToString();            try            {                HttpWebRequest hr = (HttpWebRequest)WebRequest.Create(targeturl);                hr.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)";                hr.Method = "GET";                hr.Timeout = 30 * 60 * 1000;                WebResponse hs = hr.GetResponse();                Stream sr = hs.GetResponseStream();                StreamReader ser = new StreamReader(sr, Encoding.Default);                strRet = ser.ReadToEnd();            }            catch (Exception ex)            {                strRet = null;            }            return strRet;        }

                string theIP = YMethod.GetHostAddress();                string msg = YMethod.GetInfoByUrl(GetPostUrl(theIP));                msg = System.Text.RegularExpressions.Regex.Unescape(msg);                Response.Write(msg);