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asp.net 下载功能的几种方法
上一篇 / 下一篇 2011-09-04 11:26:24 / 个人分类：.net
//TransmitFile实现下载
protectedvoidButton1_Click(objectsender, EventArgs e)
{
/*
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=z.zip");
stringfilename=Server.MapPath("DownLoad/aaa.zip");
Response.TransmitFile(filename);
}
//WriteFile实现下载
protectedvoidButton2_Click(objectsender, EventArgs e)
{
/*
using System.IO;
*/
stringfileName="aaa.zip";//客户端保存的文件名
stringfilePath=Server.MapPath("DownLoad/aaa.zip");//路径
FileInfo fileInfo=newFileInfo(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();
}
//WriteFile分块下载
protectedvoidButton3_Click(objectsender, EventArgs e)
{
stringfileName="aaa.zip";//客户端保存的文件名
stringfilePath=Server.MapPath("DownLoad/aaa.zip");//路径
System.IO.FileInfo fileInfo=newSystem.IO.FileInfo(filePath);
if(fileInfo.Exists==true)
{
constlongChunkSize=102400;//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=newbyte[ChunkSize];
Response.Clear();
System.IO.FileStream iStream=System.IO.File.OpenRead(filePath);
longdataLengthToRead=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)
{
intlengthRead=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();
}
}
//流方式下载
protectedvoidButton4_Click(objectsender, EventArgs e)
{
stringfileName="aaa.zip";//客户端保存的文件名
stringfilePath=Server.MapPath("DownLoad/aaa.zip");//路径
//以字符流的形式下载文件
FileStream fs=newFileStream(filePath, FileMode.Open);
byte[] bytes=newbyte[(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();
}
protectedvoidButton1_Click(objectsender, EventArgs e)
{
/*
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=z.zip");
stringfilename=Server.MapPath("DownLoad/aaa.zip");
Response.TransmitFile(filename);
}
//WriteFile实现下载
protectedvoidButton2_Click(objectsender, EventArgs e)
{
/*
using System.IO;
*/
stringfileName="aaa.zip";//客户端保存的文件名
stringfilePath=Server.MapPath("DownLoad/aaa.zip");//路径
FileInfo fileInfo=newFileInfo(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();
}
//WriteFile分块下载
protectedvoidButton3_Click(objectsender, EventArgs e)
{
stringfileName="aaa.zip";//客户端保存的文件名
stringfilePath=Server.MapPath("DownLoad/aaa.zip");//路径
System.IO.FileInfo fileInfo=newSystem.IO.FileInfo(filePath);
if(fileInfo.Exists==true)
{
constlongChunkSize=102400;//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=newbyte[ChunkSize];
Response.Clear();
System.IO.FileStream iStream=System.IO.File.OpenRead(filePath);
longdataLengthToRead=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)
{
intlengthRead=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();
}
}
//流方式下载
protectedvoidButton4_Click(objectsender, EventArgs e)
{
stringfileName="aaa.zip";//客户端保存的文件名
stringfilePath=Server.MapPath("DownLoad/aaa.zip");//路径
//以字符流的形式下载文件
FileStream fs=newFileStream(filePath, FileMode.Open);
byte[] bytes=newbyte[(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();
}
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