【Asp】Asp.net 下载功能的解决方案-net-下载功能

欢迎您访问我爱IT技术网，今天小编为你分享的编程技术是：【Asp.net 下载功能的解决方案】，下面是详细的讲解！

Asp.net 下载功能的解决方案

public class DownloadHandler : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
HttpResponse Response=context.Response;
HttpRequest Request=context.Request;
System.IO.Stream iStream=null;
byte[] buffer=new Byte[10240];
int length;
long dataToRead;
try
{
string filename=FileHelper.Decrypt(Request["fn"]); //通过解密得到文件名
string filepath=HttpContext.Current.Server.MapPath("~/") + "files/" + filename; //待下载的文件路径
iStream=new System.IO.FileStream(filepath, System.IO.FileMode.Open,
System.IO.FileAccess.Read, System.IO.FileShare.Read);
Response.Clear();
dataToRead=iStream.Length;
long p=0;
if (Request.Headers["Range"] !=null)
{
Response.StatusCode=206;
p=long.Parse(Request.Headers["Range"].Replace("bytes=", "").Replace("-", ""));
}
if (p !=0)
{
Response.AddHeader("Content-Range", "bytes " + p.ToString() + "-" + ((long)(dataToRead - 1)).ToString() + "/" + dataToRead.ToString());
}
Response.AddHeader("Content-Length", ((long)(dataToRead - p)).ToString());
Response.ContentType="application/octet-stream";
Response.AddHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode(System.Text.Encoding.GetEncoding(65001).GetBytes(Path.GetFileName(filename))));
iStream.Position=p;
dataToRead=dataToRead - p;
while (dataToRead > 0)
{
if (Response.IsClientConnected)
{
length=iStream.Read(buffer, 0, 10240);
Response.OutputStream.Write(buffer, 0, length);
Response.Flush();
buffer=new Byte[10240];
dataToRead=dataToRead - length;
}
else
{
dataToRead=-1;
}
}
}
catch (Exception ex)
{
Response.Write("Error : " + ex.Message);
}
finally
{
if (iStream !=null)
{
iStream.Close();
}
Response.End();
}
}
public bool IsReusable
{
get { return true; }
}
}

关于Asp.net 下载功能的解决方案的用户互动如下：

　　相关问题：

　　答： >>详细

　　相关问题：

　　答： >>详细

　　相关问题：

　　答： >>详细