1、asp實現(xiàn)下載的代碼
<%
filename = Request.QueryString("FileName")
if filename = "" then
Response.Write "請輸入filename參數(shù),指定下載的文件名"
else
Response.ContentType = "application/octet-stream"
Response.AddHeader "content-disposition", "attachment; filename =" & filename
Set FileStream = Server.CreateObject("Adodb.Stream")
FileStream.Mode = 3
FileStream.Type = 1
FileStream.Open
FileStream.LoadFromFile( Server.MapPath(filename))
Response.BinaryWrite( FileStream.Read )
FileStream.Close()
Set FileStream = nothing
end if
% >把上述代碼存成asp類型的文件,使用時類似:download.asp?filename=a.gif。
2、使用WebClient 在下載按鈕事件中加入如下代碼
System.Net.WebClient wc = new System.Net.WebClient();
wc.DownloadFile( "http://localhost/a.gif", "c:\a.gif");
上述代碼會把服務(wù)器端的a.gif文件在沒有任何提示的情況下下載的客戶端的c盤,沒有任何提示還是比較可怕的,不過有的時候確實需要這樣做。該代碼也可以在桌面程序運行。 3、帶有下載提示的ASP NET下載代碼
//打開要下載的文件
System.IO.FileStream r = new System.IO.FileStream(FileName, System.IO.FileMode.Open);
//設(shè)置基本信息
Response.Buffer = false;
Response.AddHeader("Connection", "Keep-Alive");
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", "attachment;filename=" + System.IO.Path.GetFileName(FileName));
Response.AddHeader("Content-Length", r.Length.ToString());
while (true)
{
//開辟緩沖區(qū)空間
byte[] buffer = new byte[1024];
//讀取文件的數(shù)據(jù)
int leng = r.Read(buffer, 0, 1024);
if (leng == 0)//到文件尾,結(jié)束
break;
if (leng == 1024)//讀出的文件數(shù)據(jù)長度等于緩沖區(qū)長度,直接將緩沖區(qū)數(shù)據(jù)寫入
Response.BinaryWrite(buffer);
else
{
//讀出文件數(shù)據(jù)比緩沖區(qū)小,重新定義緩沖區(qū)大小,只用于讀取文件的最后一個數(shù)據(jù)塊
byte[] b = new byte[leng];
for (int i = 0; i < leng; i++)
b[i] = buffer[i];
Response.BinaryWrite(b);
}
}
r.Close();//關(guān)閉下載文件
Response.End();//結(jié)束文件下載
該方法有下載提示框,服務(wù)器端可以知道何時下載完畢。