根据ip获取用户地理位置

各大网站都提供根据ip获取用户地理位置信息，这里以新浪的接口为例子

接口地址为：http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js&ip=218.18.171.146

代码：

 1         #region 根据ip获取地点
 2         /// 获取Ip归属地
 3         /// </summary>
 4         /// <param name="ip">ip</param>
 5         /// <returns>归属地</returns>
 6         public static string GetIpAddress(string ip)
 7         {
 8             JavaScriptSerializer Jss = new JavaScriptSerializer();
 9             //http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js&ip=218.18.171.146 调用新浪的接口
10             //var remote_ip_info = {"ret":1,"start":-1,"end":-1,"country":"u4e2du56fd","province":"u5e7fu4e1c","city":"u6df1u5733","district":"","isp":"","type":"","desc":""};
11             string address = string.Empty;
12             try
13             {
14                 string reText = WebRequestPostOrGet("http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js&ip="+ip, "");
15                 reText = reText.Split('=')[1].Split(';')[0].Trim();
16                 Dictionary<string, object> DicText = (Dictionary<string, object>)Jss.DeserializeObject(reText);
17                 address = DicText["city"].ToString();
18             }
19             catch { }
20             return address;
21         }
22         #endregion

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其中WebRequestPostOrGet方法:

 1         #region Post/Get提交调用抓取
 2         /// <summary>
 3         /// Post/get 提交调用抓取
 4         /// </summary>
 5         /// <param name="url">提交地址</param>
 6         /// <param name="param">参数</param>
 7         /// <returns>string</returns>
 8         public static string WebRequestPostOrGet(string sUrl, string sParam)
 9         {
10             byte[] bt = System.Text.Encoding.UTF8.GetBytes(sParam);
11 
12             Uri uriurl = new Uri(sUrl);
13             HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(uriurl);//HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url + (url.IndexOf("?") > -1 ? "" : "?") + param);
14             req.Method = "Post";
15             req.Timeout = 120 * 1000;
16             req.ContentType = "application/x-www-form-urlencoded;";
17             req.ContentLength = bt.Length;
18 
19             using (Stream reqStream = req.GetRequestStream())//using 使用可以释放using段内的内存
20             {
21                 reqStream.Write(bt, 0, bt.Length);
22                 reqStream.Flush();
23             }
24             try
25             {
26                 using (WebResponse res = req.GetResponse())
27                 {
28                     //在这里对接收到的页面内容进行处理 
29 
30                     Stream resStream = res.GetResponseStream();
31 
32                     StreamReader resStreamReader = new StreamReader(resStream, System.Text.Encoding.UTF8);
33 
34                     string resLine;
35 
36                     System.Text.StringBuilder resStringBuilder = new System.Text.StringBuilder();
37 
38                     while ((resLine = resStreamReader.ReadLine()) != null)
39                     {
40                         resStringBuilder.Append(resLine + System.Environment.NewLine);
41                     }
42 
43                     resStream.Close();
44                     resStreamReader.Close();
45 
46                     return resStringBuilder.ToString();
47                 }
48             }
49             catch (Exception ex)
50             {
51                 return ex.Message;//url错误时候回报错
52             }
53         }
54         #endregion Post/Get提交调用抓取

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