Csharp:WebClient and WebRequest use http download file
//Csharp:WebClient and WebRequest use http download file
//20140318 塗聚文收錄
string filePath = "20140302.pdf";
string fileName = "http://www.dusystem.com/3.pdf"; //1出现找不到文件 filePath
//string headerValue = (Request.UserAgent.ToLower().Contains("msie"))? string.Format("attachment; filename=\"{0}\"", Uri.EscapeDataString(fileName)): string.Format("attachment; filename=\"{0}\"", fileName); //for Firefox, Chrome, Safari, Opera
//Response.Clear();
//Response.ContentType = "text/plain";
//Response.AddHeader("Content-Disposition", headerValue);
//Response.TransmitFile(filePath);
//Response.End(); //2: 有效 WebException ex
//System.Net.WebClient net = new System.Net.WebClient();
//string link = fileName;
//Response.ClearHeaders();
//Response.Clear();
//Response.Expires = 0;
//Response.Buffer = true;
//Response.AddHeader("Accept-Language", "utf-8");
//Response.AddHeader("Content-Disposition", "Attachment;FileName=" + System.Web.HttpUtility.UrlEncode(link, System.Text.Encoding.UTF8));
//Response.ContentType = "APPLICATION/octet-stream";
//Response.BinaryWrite(net.DownloadData(link));
//Response.End(); //3:有效,但文件是空
//string dir = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory);
//string myFileName = dir + @"\213.pdf";
//HttpWebRequest request = (HttpWebRequest)WebRequest.Create(fileName); // //request.MaximumResponseHeadersLength = 40000;
//request.Timeout = 20000;
//request.Credentials = CredentialCache.DefaultCredentials;
//HttpWebResponse response = (HttpWebResponse)request.GetResponse();
//Stream receiveStream = response.GetResponseStream();
//StreamReader readStream = new StreamReader(receiveStream, Encoding.UTF8); //using (StreamWriter sw = new StreamWriter(myFileName, false, Encoding.UTF8))
//{
// sw.Write(readStream.ReadToEnd());
// sw.Flush();
// sw.Close(); //} //4。有效
//byte[] result;
//byte[] buffer = new byte[4096];
//string link = fileName;
//WebRequest wr = WebRequest.Create(fileName);
//WebResponse response = wr.GetResponse();
//Stream responseStream = response.GetResponseStream();
//MemoryStream memoryStream = new MemoryStream();
//Response.AddHeader("Accept-Language", "utf-8");
//Response.AddHeader("Content-Disposition", "Attachment;FileName=" + System.Web.HttpUtility.UrlEncode(link, System.Text.Encoding.UTF8));
//Response.ContentType = "APPLICATION/octet-stream";
//int count = 0;
//do
//{
// count = responseStream.Read(buffer, 0, buffer.Length);
// memoryStream.Write(buffer, 0, count);
// Response.BinaryWrite(buffer);
// //Response.OutputStream.Write(buffer,0,count);
//}
//while (count != 0);
//result = memoryStream.ToArray(); //5。有效
string dir = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory);
string fullFileName = dir + @"\213.pdf";
HttpWebRequest hRequest = (HttpWebRequest)WebRequest.Create(fileName);
WebResponse response = hRequest.GetResponse();
using (response = (HttpWebResponse)hRequest.GetResponse())
{
/*Download the file to the fullFileName location */
Stream streamResponse = response.GetResponseStream();
if (streamResponse != null)
{
byte[] inBuf = new byte[response.ContentLength];
int bytesToRead = System.Convert.ToInt32(inBuf.Length);
int bytesRead = 0;
while (bytesToRead > 0)
{
int n = streamResponse.Read(inBuf, bytesRead, bytesToRead);
if (n == 0)
{
break;
}
bytesRead += n;
bytesToRead -= n;
} FileStream fstr = new FileStream(fullFileName, FileMode.OpenOrCreate, FileAccess.Write);
fstr.Write(inBuf, 0, bytesRead);
streamResponse.Close();
streamResponse.Dispose();
fstr.Close();
fstr.Dispose();
}
}
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