1 using System;
2 using System.Data;
3 using System.Configuration;
4 using System.Web;
5 using System.Web.Security;
6 using System.Web.UI;
7 using System.Web.UI.WebControls;
8 using System.Web.UI.WebControls.WebParts;
9 using System.Web.UI.HtmlControls;
10 using System.IO;
11
12 public partial class _Default : System.Web.UI.Page
13 {
14 protected void Page_Load(object sender, EventArgs e)
15 {
16
17 }
18
19 //TransmitFile实现下载
20 protected void Button1_Click(object sender, EventArgs e)
21 {
22 Response.ContentType = "application/x-zip-compressed";
23 Response.AddHeader("Content-Disposition", "attachment;filename=z.zip");
24 string filename = Server.MapPath("DownLoad/z.zip");
25 Response.TransmitFile(filename);
26 }
27
28 //WriteFile实现下载
29 protected void Button2_Click(object sender, EventArgs e)
30 {
31 string fileName ="asd.txt";//客户端保存的文件名
32 string filePath=Server.MapPath("DownLoad/aaa.txt");//路径
33
34 FileInfo fileInfo = new FileInfo(filePath);
35 Response.Clear();
36 Response.ClearContent();
37 Response.ClearHeaders();
38 Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
39 Response.AddHeader("Content-Length", fileInfo.Length.ToString());
40 Response.AddHeader("Content-Transfer-Encoding", "binary");
41 Response.ContentType = "application/octet-stream";
42 Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
43 Response.WriteFile(fileInfo.FullName);
44 Response.Flush();
45 Response.End();
46 }
47
48 //WriteFile分块下载
49 protected void Button3_Click(object sender, EventArgs e)
50 {
51 string fileName = "aaa.txt";//客户端保存的文件名
52 string filePath = Server.MapPath("DownLoad/aaa.txt");//路径
53
54 System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);
55
56 if (fileInfo.Exists == true)
57 {
58 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
59 byte[] buffer = new byte[ChunkSize];
60
61 Response.Clear();
62 System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);
63 long dataLengthToRead = iStream.Length;//获取下载的文件总大小
64 Response.ContentType = "application/octet-stream";
65 Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName));
66 while (dataLengthToRead > 0 && Response.IsClientConnected)
67 {
68 int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小
69 Response.OutputStream.Write(buffer, 0, lengthRead);
70 Response.Flush();
71 dataLengthToRead = dataLengthToRead - lengthRead;
72 }
73 Response.Close();
74 }
75 }
76
77 //流方式下载
78 protected void Button4_Click(object sender, EventArgs e)
79 {
80 string fileName = "aaa.txt";//客户端保存的文件名
81 string filePath = Server.MapPath("DownLoad/aaa.txt");//路径
82
83 //以字符流的形式下载文件
84 FileStream fs = new FileStream(filePath, FileMode.Open);
85 byte[] bytes = new byte[(int)fs.Length];
86 fs.Read(bytes, 0, bytes.Length);
87 fs.Close();
88 Response.ContentType = "application/octet-stream";
89 //通知浏览器下载文件而不是打开
90 Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
91 Response.BinaryWrite(bytes);
92 Response.Flush();
93 Response.End();
94
95 }
96 }
摘抄自http://www.admin10000.com/document/804.html
