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//1.页面上用linkbutton
<asp:LinkButton ID="lbtnDownload" runat="server" onclick="lbtnDownload_Click">下载</asp:LinkButton>
//2.事件中用字符流方式下载
protected void lbtnDownload_Click(object sender, EventArgs e)
{
string fileName = "1.REP";//客户端保存的文件名
string filePath = Server.MapPath("1.REP");//路径
//以字符流的形式下载文件
System.IO.FileStream fs = new System.IO.FileStream(filePath, System.IO.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();
}
string filePath = Server.MapPath("/") +Url;
#region 文件下载
// 创建一比特数组
byte[] buffer = new Byte[10240];
// 指定要下载文件的路径.
// 或取文件名包括扩展名
string fileName = Path.GetFileName(filePath);
Stream fileStream = null;
try
{
// 打开文件
fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);
Response.Clear();
// 获取文件的大小
long fileSize = fileStream.Length;
long sum = 0;
if (Request.Headers["Range"] != null)
{
Response.StatusCode = 206; // 表示返回到客户端的 HTTP 输出状态的整数。默认值为 200。
sum = long.Parse(Request.Headers["Range"].Replace("bytes=", "").Replace("-", ""));
}
if (sum != 0)
{
Response.AddHeader("Content-Range", "bytes " + sum.ToString() + "-" + ((long)(fileSize)).ToString() + "/" + fileSize.ToString());
}
// 获取部分http头信息
Response.AddHeader("Content-Length", ((long)(fileSize - sum)).ToString());
Response.ContentType = "application/octet-stream";
//获取文件来源
Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(Request.ContentEncoding.GetBytes(fileName)));
// Response.Flush();
fileStream.Position = sum; //设置当前流位置
fileSize = fileSize - sum;
// 当文件大小大于0是进入循环
while (fileSize > 0)
{
// 判断客户端是否仍连接在服务器
if (Response.IsClientConnected)
{
// 获取缓冲区中的总字节数.
int length = fileStream.Read(buffer, 0, 10240);
// 写入数据
Response.OutputStream.Write(buffer, 0, length);
// 将缓冲区的输出发送到客户端
Response.Flush();
buffer = new Byte[10240];
fileSize = fileSize - length;
}
else
{
//当用户断开后退出循环
fileSize = -1;
}
}
}
catch (Exception ex)
{
Response.Write("Error : " + ex.Message);
}
finally
{
if (fileStream != null)
{
//关闭文件
fileStream.Close();
}
Response.End();
}
Response.ContentType = "application/x-zip-compressed";
Response.AddHeader("Content-Disposition", "attachment;filename=jquery.form.js");
string filename = Server.MapPath("js/jquery.form.js");
Response.TransmitFile(filename);