response.addheader下载为HTML文件
用response.addhearder（）做下载测试，但是下载下来的文件都是html文件 和原来的类型不符，请大大指点一下，如何使下载和原来文件同一类型if (Session["txt"] != "")
{
string path = Server.MapPath(@"~\\upLoadFile\\" + company + "\\") + Session["txt"].ToString();
FileInfo fi = new FileInfo(path);
if (fi.Exists)
{
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(fi.Name));
}
} --------------------编程问答--------------------
--------------------编程问答--------------------
//下载的四种方法
protected void Button1_Click(object sender, EventArgs e)
{
//TransmitFile实现下载
/**/
/*
微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite
下载超过400mb的文件时导致Aspnet_wp.exe进程回收而无法成功下载的问题。
代码如下：
*/
Response.ContentType = "application/x-zip-compressed";
Response.AddHeader("Content-Disposition", "attachment;filename=keji.rar");
string filename = Server.MapPath("keji.rar");
Response.TransmitFile(filename);
Response.Write("<script language=\"javascript\" type=\"text/javascript\">");
Response.Write("alert(\"下载成功\");");
Response.Write("window.location.href=\"C_SC.aspx\";");
Response.Write("</script>");
}
protected void Button2_Click(object sender, EventArgs e)
{
//WriteFile实现下载
string fileName = "ceshi.rar";//客户端保存的文件名
string filePath = Server.MapPath("keji.rar");//路径
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();
}
protected void Button3_Click(object sender, EventArgs e)
{
//WriteFile分块下载
string fileName = "GhostXP.iso";//客户端保存的文件名
string filePath = Server.MapPath("GhostXP7.7.iso");//路径
System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);
if (fileInfo.Exists == true)
{
const long ChunkSize = 409600;//100K 每次读取文件，只读取100Ｋ，这样可以缓解服务器的压力
byte[] buffer = new byte[ChunkSize];
Response.Clear();
System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);
long dataLengthToRead = iStream.Length;//获取下载的文件总大小
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));//读取的大小
Response.OutputStream.Write(buffer, 0, lengthRead);
Response.Flush();
dataLengthToRead = dataLengthToRead - lengthRead;
}
Response.Close();
}
}
//字符流方式下载文件
protected void Button4_Click(object sender, EventArgs e)
{
string fileName = "ce2.rar";//客户端保存的文件名
string filePath = Server.MapPath("keji.rar");//路径
//以字符流的形式下载文件
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";
//通知浏览器下载文件而不是打开
Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
Response.BinaryWrite(bytes);
Response.Flush();
Response.End();
}
#region 文件下载
public bool DownLoadFile(string localPath, string hostURL, int byteCount, string userID, long cruuent)
{
bool result = true;
string tmpURL = hostURL;
byteCount = byteCount * 1024;
hostURL = tmpURL + "&npos=" + cruuent.ToString();
System.IO.FileStream fs;
fs = new FileStream(localPath, FileMode.OpenOrCreate);
if (cruuent > 0)
{
//偏移指针
fs.Seek(cruuent, System.IO.SeekOrigin.Current);
}
System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(hostURL);
if (cruuent > 0)
{
request.AddRange(Convert.ToInt32(cruuent)); //设置Range值
}
try
{
//向服务器请求，获得服务器回应数据流
System.IO.Stream ns = request.GetResponse().GetResponseStream();
byte[] nbytes = new byte[byteCount];
int nReadSize = 0;
nReadSize = ns.Read(nbytes, 0, byteCount);
while (nReadSize > 0)
{
fs.Write(nbytes, 0, nReadSize);
nReadSize = ns.Read(nbytes, 0, byteCount);
}
fs.Close();
ns.Close();
}
catch(Exception ex)
{
LOG.Error("下载" + localPath + "的时候失败！" + "原因是:" + ex.Message);
fs.Close();
result = false;
}
return result;
}
#endregion
补充：.NET技术 , ASP.NET
