asp.net 用流的方式下載檔案
//以下程式碼根據別人文章和自己整理
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
namespace WebApplication1
{
public partial class DownfFile : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
/// <summary>
/// WriteFile下載
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Button1_Click(object sender, EventArgs e)
{
string name ="DreamweaverCS3簡體中文免啟用綠色版.rar";
string path =Server.MapPath("DreamweaverCS3簡體中文免啟用綠色版.rar");
FileInfo fileinfo = new FileInfo(path);
long size = fileinfo.Length;
Response.Clear();
Response.ContentType = "application/octet-stream";
Response.AppendHeader("Content-Disposition", "attachment;filename=" + name);
Response.AppendHeader("Content-Length", size.ToString());
Response.AppendHeader("Content-Transfer-Encoding", "binary");
Response.ContentEncoding = System.Text.Encoding.UTF8;//GetEncoding("gb2312");
Response.WriteFile(path,0,size);
Response.Flush();
Response.End();
}
/// <summary>
/// 使用OutputStream.Write分塊下載檔案
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Button2_Click(object sender, EventArgs e)
{
string fileName = HttpContext.Current.Server.UrlEncode("DreamweaverCS3簡體中文免啟用綠色版.rar");
string filePath = HttpContext.Current.Server.MapPath("DreamweaverCS3簡體中文免啟用綠色版.rar");
//如果要寫類的話用HttpResponse ht=Page.Response然後方法寫void DownloadFile(HttpResponse response, string serverPath)
FileInfo fileinfo = new FileInfo(filePath);
if (fileinfo.Exists)
{
const long size = 102400; //指定下載塊的大小
byte[] by = new byte[size]; //建立一個100kb的快取去大小
long dataread = 0; //已讀的位元組數
try
{
//開啟檔案
FileStream filestream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
dataread = filestream.Length;//檔案總的大小
int i = 0;
//新增Http頭
Response.Clear();
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", "attachement;filename=" + fileName);
Response.AddHeader("Content-Length", dataread.ToString());
while (dataread > 0)
{
if (Response.IsClientConnected)
{
int length = filestream.Read(by,0, Convert.ToInt32(size));
Response.OutputStream.Write(by, 0, length);
Response.Flush();
Response.Clear();
by = new byte[size];
i++;
dataread = dataread - length;//判斷是否讀取玩 如果讀取完就跳出while迴圈
}
else
{
dataread = -1;//客戶端已經失去連線中段操作
}
//filestream.Close();
//Response.Close();就是多寫這行程式碼 導致下載檔案只有100kb
}
}
catch { }
}
}
/// <summary>
/// 使用BinaryWrite下載檔案，大檔案效率不行
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Button3_Click(object sender, EventArgs e)
{
string name = "DreamweaverCS3簡體中文免啟用綠色版.rar";
string path = Server.MapPath("DreamweaverCS3簡體中文免啟用綠色版.rar");
FileStream filestream = File.OpenRead(path);
byte[] by = new byte[filestream.Length];
filestream.Read(by, 0, by.Length);
filestream.Close();
Response.ContentType = "application/octet-stream";
Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(name));
Response.AddHeader("Content-Length", by.Length.ToString());
Response.BinaryWrite(by);
Response.Flush();
Response.End();
}
/// <summary>
/// 使用TransmifFile下載檔案
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Button4_Click(object sender, EventArgs e)
{
//提供下載的檔案，不編碼的話檔名會亂碼
string fileName = "DreamweaverCS3簡體中文免啟用綠色版.rar"; //HttpContext.Current.Server.UrlEncode("DreamweaverCS3簡體中文免啟用綠色版.rar");
string filePath = Server.MapPath("DreamweaverCS3簡體中文免啟用綠色版.rar");//HttpContext.Current.Server.UrlEncode(Server.MapPath("DreamweaverCS3簡體中文免啟用綠色版.rar"));
FileInfo fileinfo = new FileInfo(filePath);
long filesize = fileinfo.Length;
Response.Clear();
Response.ContentType = "application/x-zip-compressed";
Response.AddHeader("Content-Disposition", "attachment;filename="+ fileName);
//不指明Content-Length用Flush的話不會顯示下載進度
Response.AddHeader("Content-Length", filesize.ToString());
Response.TransmitFile(fileName, 0, filesize);
Response.Flush();
Response.Close();
}
/// <summary>
/// 使用BinaryWrite分塊下載檔案
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Button5_Click(object sender, EventArgs e)
{
string fileName = HttpContext.Current.Server.UrlEncode("DreamweaverCS3簡體中文免啟用綠色版.rar");
string filePath = HttpContext.Current.Server.MapPath("DreamweaverCS3簡體中文免啟用綠色版.rar");
long size = 102400; //指定下載塊的大小
byte[] by = new byte[size]; //建立一個100kb的快取去大小
long dataread = 0; //已讀的位元組數
try
{
//開啟檔案
FileStream filestream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
dataread = filestream.Length;//檔案總的大小
//新增Http頭
Response.Clear();
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", "attachement;filename=" + fileName);
Response.AddHeader("Content-Length", dataread.ToString());
while (dataread > 0)
{
if (Response.IsClientConnected)
{
int length = filestream.Read(by, 0, Convert.ToInt32(size));
Response.BinaryWrite(by);
Response.Flush();
Response.Clear();
dataread = dataread - length;//判斷是否讀取玩 如果讀取完就跳出while迴圈
}
else
{
dataread = -1;//客戶端已經失去連線中段操作
}
//filestream.Close();
//Response.Close();
}
}
catch { }
}
}
}