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【Asp.Net】下载功能

作者:Amanda / 发布于2015/3/12/ 517


	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;
	
	
	
	public partial class _Default : System.Web.UI.Page
	{
	protected void Page_Load(object sender, EventArgs e)
	{
	
	}
	
	//TransmitFile实现下载
	protected void 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);
	}
	
	//WriteFile实现下载
	protected void 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();
	}
	
	//WriteFile分块下载
	protected void 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)
	{
	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();
	}
	}
	
	//流方式下载
	protected void 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 = 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();
	
	}
	}

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