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：

#region Post/Get提交调用抓取
/// <summary>
/// Post/get 提交调用抓取
/// </summary>
/// <param name="url">提交地址</param>
/// <param name="param">参数</param>
/// <returns>string</returns>
public static string WebRequestPostOrGet(string sUrl, string sParam)
{
byte[] bt = System.Text.Encoding.UTF8.GetBytes(sParam);

Uri uriurl = new Uri(sUrl);
HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(uriurl);//HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url + (url.IndexOf("?") > -1 ? "" : "?") + param);
req.Method = "Post";
req.Timeout = 120 * 1000;
req.ContentType = "application/x-www-form-urlencoded;";
req.ContentLength = bt.Length;

using (Stream reqStream = req.GetRequestStream())//using 使用可以释放using段内的内存
{
reqStream.Write(bt, 0, bt.Length);
reqStream.Flush();
}
try
{
using (WebResponse res = req.GetResponse())
{
//在这里对接收到的页面内容进行处理

Stream resStream = res.GetResponseStream();

StreamReader resStreamReader = new StreamReader(resStream, System.Text.Encoding.UTF8);

string resLine;

System.Text.StringBuilder resStringBuilder = new System.Text.StringBuilder();

while ((resLine = resStreamReader.ReadLine()) != null)
{
resStringBuilder.Append(resLine + System.Environment.NewLine);
}

resStream.Close();
resStreamReader.Close();

return resStringBuilder.ToString();
}
}
catch (Exception ex)
{
return ex.Message;//url错误时候回报错
}
}
#endregion Post/Get提交调用抓取

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