能實現(xiàn)網(wǎng)站下載的功能語言都是動態(tài)語言,除了asp.net,還有php,jsp等,這里以asp.net為例。
這種可以實現(xiàn)多種網(wǎng)站下載功能, 代碼如下:
//TransmitFile實現(xiàn)下載
protected void Button1_Click(object sender, EventArgs e)
{
Response.ContentType = "application/x-zip-compressed";
Response.AddHeader("Content-Disposition", "p_w_upload;filename=z.zip");
string filename = Server.MapPath("DownLoad/aaa.zip");
Response.TransmitFile(filename);
}
//WriteFile實現(xiàn)下載
protected void Button2_Click(object sender, EventArgs e)
{
string fileName ="aaa.zip";//客戶端保存的文件名
string filePath=Server.MapPath("DownLoad/aaa.zip");//路徑
FileInfo fileInfo = new FileInfo(filePath);
Response.Clear();
Response.ClearContent();
Response.ClearHeaders();
Response.AddHeader("Content-Disposition", "p_w_upload;filename=" + fileName);
Response.AddHeader("Content-Length", fileInfo.Length.ToString());
Response.AddHeader("Content-Transfer-Encoding", "binary");
Response.ContentType = "application/octet-stream";
Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
Response.WriteFile(fileInfo.FullName);
Response.Flush();
Response.End();
//WriteFile分塊下載
protected void Button3_Click(object sender, EventArgs e)
{
string fileName = "aaa.zip";//客戶端保存的文件名
string filePath = Server.MapPath("DownLoad/aaa.zip");//路徑
System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);
if (fileInfo.Exists == true)
{
const long ChunkSize = 102400;//100K 每次讀取文件,只讀取100K,這樣可以緩解服務(wù)器的壓力
byte[] buffer = new byte[ChunkSize];
Response.Clear();
System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);
long dataLengthToRead = iStream.Length;//獲取下載的文件總大小
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", "p_w_upload; filename=" + HttpUtility.UrlEncode(fileName));
while (dataLengthToRead > 0 && Response.IsClientConnected)
{
int lengthRead = iStream.Read(buffer, 0,
Convert.ToInt32(ChunkSize));//讀取的大小
Response.OutputStream.Write(buffer, 0, lengthRead);
Response.Flush();
dataLengthToRead = dataLengthToRead - lengthRead;
}
Response.Close();
}
}
//流方式下載
protected void Button4_Click(object sender, EventArgs e)
{
string fileName = "aaa.zip";//客戶端保存的文件名
string filePath = Server.MapPath("DownLoad/aaa.zip");//路徑
//以字符流的形式下載文件
FileStream fs = new FileStream(filePath, FileMode.Open);
byte[] bytes = new byte[(int)fs.Length];
fs.Read(bytes, 0, bytes.Length);
fs.Close();
Response.ContentType = "application/octet-stream";
//通知瀏覽器下載文件而不是打開
Response.AddHeader("Content-Disposition", "p_w_upload; filename=" +
HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
Response.BinaryWrite(bytes);
Response.Flush();
Response.End();
}
完畢(end)
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文章題目:asp.net實現(xiàn)網(wǎng)站上傳下載功能的幾種方法-創(chuàng)新互聯(lián)
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