protected void Button1_Click(object sender, EventArgs e)
{
1 protected void Button1_Click(object sender, EventArgs e)
2 {
3 //TransmitFile实现下载
4
5 /*
6 微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite
7 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。
8 代码如下:
9 */
10
11 Response.ContentType = “application/x-zip-compressed“;
12 Response.AddHeader(“Content-Disposition“, “attachment;filename=keji.rar“);
13 string filename = Server.MapPath(“keji.rar“);
14 Response.TransmitFile(filename);
15 Response.Write(“<script language=\< span=”” style=”word-wrap: break-word;”>“javascript\“ type=\“text/javascript\“>“);
16 Response.Write(“alert(\“下载成功\“);“);
17 Response.Write(“window.location.href=\“C_SC.aspx\“;“);
18 Response.Write(““);
19
20 }
21 protected void Button2_Click(object sender, EventArgs e)
22 {
23
24 //WriteFile实现下载
25 string fileName = “ceshi.rar“;//客户端保存的文件名
26 string filePath = Server.MapPath(“keji.rar“);//路径
27
28 FileInfo fileInfo = new FileInfo(filePath);
29 Response.Clear();
30 Response.ClearContent();
31 Response.ClearHeaders();
32 Response.AddHeader(“Content-Disposition“, “attachment;filename=“ + fileName);
33 Response.AddHeader(“Content-Length“, fileInfo.Length.ToString());
34 Response.AddHeader(“Content-Transfer-Encoding“, “binary“);
35 Response.ContentType = “application/octet-stream“;
36 Response.ContentEncoding = System.Text.Encoding.GetEncoding(“gb2312“);
37 Response.WriteFile(fileInfo.FullName);
38 Response.Flush();
39 Response.End();
40
41 }
42 protected void Button3_Click(object sender, EventArgs e)
43 {
44 //WriteFile分块下载
45
46 string fileName = “GhostXP.iso“;//客户端保存的文件名
47 string filePath = Server.MapPath(“GhostXP7.7.iso“);//路径
48
49 System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);
50
51 if (fileInfo.Exists == true)
52 {
53 const long ChunkSize = 409600;//100K 每次读取文件,只读取100K,这样可以缓解服务器的压力
54 byte[] buffer = new byte[ChunkSize];
55
56 Response.Clear();
57 System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);
58 long dataLengthToRead = iStream.Length;//获取下载的文件总大小
59 Response.ContentType = “application/octet-stream“;
60 Response.AddHeader(“Content-Disposition“, “attachment; filename=“ + HttpUtility.UrlEncode(fileName));
61 while (dataLengthToRead > 0 && Response.IsClientConnected)
62 {
63 int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小
64 Response.OutputStream.Write(buffer, 0, lengthRead);
65 Response.Flush();
66 dataLengthToRead = dataLengthToRead – lengthRead;
67 }
68 Response.Close();
69 }
70 }
71
72 //字符流方式下载文件
73 protected void Button4_Click(object sender, EventArgs e)
74 {
75 string fileName = “ce2.rar“;//客户端保存的文件名
76 string filePath = Server.MapPath(“keji.rar“);//路径
77
78 //以字符流的形式下载文件
79 FileStream fs = new FileStream(filePath, FileMode.Open);
80 byte[] bytes = new byte[(int)fs.Length];
81 fs.Read(bytes, 0, bytes.Length);
82 fs.Close();
83 Response.ContentType = “application/octet-stream“;
84 //通知浏览器下载文件而不是打开
85 Response.AddHeader(“Content-Disposition“, “attachment; filename=“ + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
86 Response.BinaryWrite(bytes);
87 Response.Flush();
88 Response.End();
89
90 }
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