1 什么是物理路徑？什么是虛擬路徑？
(1) 例子：
用IIS舉個例子：
WEB服務目錄是d:\路徑
那么用HTTP訪問網站根目錄的時候，其實訪問的是d:\路徑,那么其中虛擬路徑就是\（根），物理路徑就是d:\路徑
(2) 我自己的理解：絕對路徑一般都是帶有磁盤完成路徑， 而虛擬路徑一般不帶有磁盤
2 程序中虛擬路徑和物理路徑的轉化
#region 物理路徑和相對路徑的轉換
//本地路徑轉換成URL相對路徑
private string urlconvertor(string imagesurl1)
{
string tmpRootDir = Server.MapPath(System.Web.HttpContext.Current.Request.ApplicationPath.ToString());//獲取程序根目錄
string imagesurl2 = imagesurl1.Replace(tmpRootDir, ""); //轉換成相對路徑
imagesurl2 = imagesurl2.Replace(@"\", @"/");
//imagesurl2 = imagesurl2.Replace(@"Aspx_Uc/", @"");
return imagesurl2;
}
//相對路徑轉換成服務器本地物理路徑
private string urlconvertorlocal(string imagesurl1)
{
string tmpRootDir = Server.MapPath(System.Web.HttpContext.Current.Request.ApplicationPath.ToString());//獲取程序根目錄
string imagesurl2 = tmpRootDir + imagesurl1.Replace(@"/", @"\"); //轉換成絕對路徑
return imagesurl2;
}
#endregion
3 下載的方法
/// <summary>
/// 獲取物理地址
/// </summary>
public static string MapPathFile(string FileName)
{
return HttpContext.Current.Server.MapPath(FileName);
}
/// <summary>
/// 普通下載
/// </summary>
/// <param name="FileName">文件虛擬路徑</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();
}
}
}