【asp】asp.net HttpWebRequest自动识别网页编码-net--HttpWebRequest-自动识别-网页编码

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asp.net HttpWebRequest自动识别网页编码

static string GetEncoding(string url)
{
HttpWebRequest request=null;
HttpWebResponse response=null;
StreamReader reader=null;
try
{
request=(HttpWebRequest)WebRequest.Create(url);
request.Timeout=20000;
request.AllowAutoRedirect=false;

response=(HttpWebResponse)request.GetResponse();
if (response.StatusCode==HttpStatusCode.OK && response.ContentLength < 1024 * 1024)
{
if (response.ContentEncoding !=null && response.ContentEncoding.Equals("gzip", StringComparison.InvariantCultureIgnoreCase))
reader=new StreamReader(new GZipStream(response.GetResponseStream(), CompressionMode.Decompress));
else
reader=new StreamReader(response.GetResponseStream(), Encoding.ASCII);

string html=reader.ReadToEnd();

Regex reg_charset=new Regex(@"charset\b\s*=\s*(?<charset>[^""]*)");
if (reg_charset.IsMatch(html))
{
return reg_charset.Match(html).Groups["charset"].Value;
}
else if (response.CharacterSet !=string.Empty)
{
return response.CharacterSet;
}
else
return Encoding.Default.BodyName;
}
}
catch
{
}
finally
{

if (response !=null)
{
response.Close();
response=null;
}
if (reader !=null)
reader.Close();

if (request !=null)
request=null;

}

return Encoding.Default.BodyName;
}

/// <summary>
/// 获取源代码
/// </summary>
/// <param name="url"></param>
/// <returns></returns>
static string GetHtml(string url, Encoding encoding)
{
HttpWebRequest request=null;
HttpWebResponse response=null;
StreamReader reader=null;
try
{
request=(HttpWebRequest)WebRequest.Create(url);
request.Timeout=20000;
request.AllowAutoRedirect=false;

response=(HttpWebResponse)request.GetResponse();
if (response.StatusCode==HttpStatusCode.OK && response.ContentLength < 1024 * 1024)
{
if (response.ContentEncoding !=null && response.ContentEncoding.Equals("gzip", StringComparison.InvariantCultureIgnoreCase))
reader=new StreamReader(new GZipStream(response.GetResponseStream(), CompressionMode.Decompress), encoding);
else
reader=new StreamReader(response.GetResponseStream(), encoding);
string html=reader.ReadToEnd();

return html;
}
}
catch
{
}
finally
{

if (response !=null)
{
response.Close();
response=null;
}
if (reader !=null)
reader.Close();

if (request !=null)
request=null;

}

return string.Empty;
}

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