/// <summary>
/// Http下載文件
/// </summary>
public static string HttpDownloadFile(string url, string path)
{
// 設置參數
HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
//發送請求並獲取相應迴應數據
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
//直到request.GetResponse()程序纔開始向目標網頁發送Post請求
Stream responseStream = response.GetResponseStream();
//建立本地文件寫入流
Stream stream = new FileStream(path, FileMode.Create);
byte[] bArr = new byte[1024];
int size = responseStream.Read(bArr, 0, (int)bArr.Length);
while (size > 0)
{
stream.Write(bArr, 0, size);
size = responseStream.Read(bArr, 0, (int)bArr.Length);
}
stream.Close();
responseStream.Close();
return path;
}
原文連接:http://www.jb51.net/article/47822.htm
一、TransmitFile實現下載
protected void Button1_Click(object sender, EventArgs e)
{
Response.ContentType = "application/x-zip-compressed";
Response.AddHeader("Content-Disposition", "attachment;filename=z.zip");
string filename = Server.MapPath("DownLoad/z.zip");
Response.TransmitFile(filename);
}
二、WriteFile實現下載
//WriteFile實現下載
protected void Button2_Click(object sender, EventArgs e)
{
string fileName = "asd.txt";//客戶端保存的文件名
string filePath = Server.MapPath("DownLoad/aaa.txt");//路徑
FileInfo fileInfo = new FileInfo(filePath);
Response.Clear();
Response.ClearContent();
Response.ClearHeaders();
Response.AddHeader("Content-Disposition", "attachment;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();
}
三、WriteFile分塊下載
//WriteFile分塊下載
protected void Button3_Click(object sender, EventArgs e)
{
string fileName = "aaa.txt";//客戶端保存的文件名
string filePath = Server.MapPath("DownLoad/aaa.txt");//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,這樣能夠緩解服務器的壓力
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", "attachment; 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();
}
}
四、流方式下載
//流方式下載
protected void Button4_Click(object sender, EventArgs e)
{
string fileName = "aaa.txt";//客戶端保存的文件名
string filePath = Server.MapPath("DownLoad/aaa.txt");//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", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
Response.BinaryWrite(bytes);
Response.Flush();
Response.End();
}
本文來自轉載,原地址:https://blog.csdn.net/zhruifei/article/details/78425509