您的位置：首页 > 编程语言 > ASP

asp.net下载文件几种方式

2012-04-26 18:02 369 查看

一、//TransmitFile实现下载

protectedvoid Button1_Click(object sender, 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");

string filename = Server.MapPath("DownLoad/z.zip");

Response.TransmitFile(filename);

}

二、//WriteFile实现下载

protectedvoid Button2_Click(object sender, EventArgs e)

{

/*

using System.IO;

*/

string fileName ="asd.txt";//客户端保存的文件名

string filePath = Server.MapPath("DownLoad/aaa.txt");//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();

}

三、 //WriteFile分块下载

protectedvoid Button3_Click(object sender, EventArgs e)

{

string fileName ="aaa.txt";//客户端保存的文件名

string filePath = Server.MapPath("DownLoad/aaa.txt");//路径

System.IO.FileInfo fileInfo =new System.IO.FileInfo(filePath);

if (fileInfo.Exists ==true)

{

constlong ChunkSize =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);

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();

}

}

四、//流方式下载

protectedvoid Button4_Click(object sender, EventArgs e)

{

string fileName ="aaa.txt";//客户端保存的文件名

string filePath = Server.MapPath("DownLoad/aaa.txt");//路径

//以字符流的形式下载文件

FileStream fs =new FileStream(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();

}

//----------------------------------------------------------

publicvoid DownloadFile( System.Web.UI.Page WebForm,String FileNameWhenUserDownload ,String FileBody )

{

　　WebForm.Response.ClearHeaders();

　　WebForm.Response.Clear();

　　WebForm.Response.Expires =0;

　　WebForm.Response.Buffer =true;

　　WebForm.Response.AddHeader("Accept-Language", "zh-tw");

　　//'文件名称

　　WebForm.Response.AddHeader("content-disposition", "attachment; filename='"+System.Web.HttpUtility.UrlEncode(FileNameWhenUserDownload, System.Text.Encoding.UTF8)+"'");

　　WebForm.Response.ContentType ="Application/octet-stream";

　　//'文件内容

　　WebForm.Response.Write(FileBody);//-----------

WebForm.Response.End();

}

//上面这段代码是下载一个动态产生的文本文件，若这个文件已经存在于服务器端的实体路径，则可以通过下面的函数：

publicvoid DownloadFileByFilePath( System.Web.UI.Page WebForm,String FileNameWhenUserDownload ,String FilePath )

{

　　WebForm.Response.ClearHeaders();

　　WebForm.Response.Clear();

　　WebForm.Response.Expires =0;

WebForm.Response.Buffer =true;

　　WebForm.Response.AddHeader("Accept-Language", "zh-tw");

　　//文件名称

　　WebForm.Response.AddHeader("content-disposition", "attachment; filename='"+ System.Web.HttpUtility.UrlEncode(FileNameWhenUserDownload, System.Text.Encoding.UTF8) +"'" );

　　WebForm.Response.ContentType ="Application/octet-stream";

　　//文件内容

　　WebForm.Response.Write(System.IO.File.Rea}dAllBytes(FilePath));//---------

　　WebForm.Response.End();

｝

内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理

标签：

相关文章推荐

新的分享

章节导航