1 What is a physical path? What is a virtual path?
(1) Example:
Use IIS for an example:
Web Service directory is a d:\ path
Then when using HTTP to access the root directory of the site, in fact, access to the D:\ path, then the virtual path is \ (root), the physical path is the d:\ path
(2) My own understanding: the absolute path is usually with the disk completion path, and the virtual path is generally not with the disk 2 conversion of virtual paths and physical paths in programs #region transformation of physical and relative paths
Local path converted to URL relative path
private string Urlconvertor (String imagesurl1)
{
String tmprootdir = Server.MapPath (System.Web.HttpContext.Current.Request.ApplicationPath.ToString ());//Get Program root directory
String imagesurl2 = Imagesurl1. Replace (Tmprootdir, ""); Convert to relative path
Imagesurl2 = Imagesurl2. Replace (@ "\", @ "/");
Imagesurl2 = Imagesurl2. Replace (@ "aspx_uc/", @ "");
return IMAGESURL2;
}
Relative paths are converted to server local physical paths
private string Urlconvertorlocal (String imagesurl1)
{
String tmprootdir = Server.MapPath (System.Web.HttpContext.Current.Request.ApplicationPath.ToString ());//Get Program root directory
String imagesurl2 = Tmprootdir + IMAGESURL1. Replace (@ "/", @ "\"); Convert to Absolute path
return IMAGESURL2;
}
#endregion 3 Ways to download <summary>
Get Physical Address
</summary>
public static string Mappathfile (String FileName)
{
Return HttpContext.Current.Server.MapPath (FileName);
}
<summary>
Normal download
</summary>
<param name= "filename" > File virtual path </param>
public static bool Downloadold (string FileName)
{
BOOL Bools = false;
String destfilename = Mappathfile (FileName);
if (file.exists (destFileName))
{
FileInfo fi = new FileInfo (destfilename);
HttpContext.Current.Response.Clear ();
HttpContext.Current.Response.ClearHeaders ();
HttpContext.Current.Response.Buffer = false;
HttpContext.Current.Response.AppendHeader ("Content-disposition", "attachment;filename=" + httputility.urlencode ( Path.getfilename (destFileName), System.Text.Encoding.UTF8));
HttpContext.Current.Response.AppendHeader ("Content-length", fi. Length.tostring ());
HttpContext.Current.Response.ContentType = "Application/octet-stream";
HttpContext.Current.Response.WriteFile (destFileName);
HttpContext.Current.Response.Flush ();
HttpContext.Current.Response.End ();
Bools = true;
}
return bools;
} public static void Responsefile (string path, HttpContext context)
{
context = HttpContext.Current; System.IO.Stream iStream = null;
byte[] buffer = new byte[10000];
int length;
Long dataToRead;
string filename = System.IO.Path.GetFileName (Path); Try
{
IStream = new System.IO.FileStream (path, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read);
dataToRead = Istream.length;
Context. Response.ContentType = "Application/octet-stream";
Context. Response.AddHeader ("Content-disposition", "attachment; Filename= "+ httputility.urlencode (filename, System.Text.Encoding.UTF8)); while (dataToRead > 0)
{
if (context. response.isclientconnected)
{
Length = istream.read (buffer, 0, 10000);
Context. Response.OutputStream.Write (buffer, 0, length);
Context. Response.Flush (); Buffer = new byte[10000];
dataToRead = Datatoread-length;
}
Else
{
dataToRead =-1;
}
}
}
catch (Exception ex)
{
Context. Response.Write (ex. Message);
}
Finally
{
if (iStream! = null)
{
Istream.close ();
}
}
} public static void Responsefile (string path, String fileName, HttpContext context)
{
context = HttpContext.Current; System.IO.Stream iStream = null;
byte[] buffer = new byte[10000];
int length;
Long dataToRead; Try
{
IStream = new System.IO.FileStream (path, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read);
dataToRead = Istream.length;
Context. Response.ContentType = "Application/octet-stream";
Context. Response.AddHeader ("Content-disposition", "attachment; Filename= "+ httputility.urlencode (FileName, System.Text.Encoding.UTF8)); while (dataToRead > 0)
{
if (context. response.isclientconnected)
{
Length = istream.read (buffer, 0, 10000);
Context. Response.OutputStream.Write (buffer, 0, length);
Context. Response.Flush (); Buffer = new byte[10000];
dataToRead = Datatoread-length;
}
Else
{
dataToRead =-1;
}
}
}
catch (Exception ex)
{
Context. Response.Write (ex. Message);
}
Finally
{
if (iStream! = null)
{
Istream.close ();
}
}
} |
