1.在ASP.NET中下载文件方法总结
项目:Lesson1_DownLoad
Default.aspx:
<form id="form1" runat="server">
<div>
下载的方法列举:<br />
<asp:Button ID="Button1" runat="server" Text="DownLoad" OnClick="Button1_Click" Font-Bold="True"/>
</div>
</form>
Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO; //added
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
//下载
protected void Button1_Click(object sender, EventArgs e)
{
//方法一: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=z.zip");
//string filename = Server.MapPath("~/z.zip");
//Response.TransmitFile(filename);
//方法二:WriteFile实现下载
//string fileName = "asd.txt";//客户端保存的文件名
//string filePath = Server.MapPath("~/zhangq.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();
//方法三:WriteFile分块下载
//string fileName = "zhangq.txt";//客户端保存的文件名
//string filePath = Server.MapPath("~/zhangq.txt");//路径
//System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);
//if (fileInfo.Exists == true)
//{
// const long 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 = 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();
//}
//方法四:流方式下载
//string fileName = "aaa.txt";//客户端保存的文件名
//string filePath = Server.MapPath("~/zhangq.txt");//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();
//方法五:动态产生一个文本文件zhangqing.txt,文件内容是第三个参数的值.
//DownloadFile(this, "zhangqing", "zhangqing!");
//方法六:动态产生一个文本文件zhangqing.txt,文件内容是服务器端已存在的文件zhangq.txt的内容
string filePath = Server.MapPath("~/zhangq.txt");//路径
DownloadFileByFilePath(this, "zhangqing", filePath);
}
//方法五:
public void 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();
}
public void 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.ReadAllBytes(FilePath));//---------
WebForm.Response.End();
}
}
参考:http://hi.baidu.com/dreamyear/blog/item/6c50202a031a1b305343c12b.html
