1 /// <summary>
2 /// 下载文件 TransmitFile
3 /// </summary>
4 /// <param name="filePath"></param>
5 public static void DownloadFile(string filePath)
6 {
7 string filename = HttpContext.Current.Server.MapPath(filePath);
8 var response = HttpContext.Current.Response;
9 response.ContentType = "application/x-zip-compressed";
10 response.AddHeader("Content-Disposition", "attachment;filename=" + Path.GetFileName(filename) );
11 response.TransmitFile(filename);
12 }
13
14 /// <summary>
15 /// 下载大文件
16 /// </summary>
17 /// <param name="filePath"></param>
18 public static void DownloadBigFile(string filePath)
19 {
20 filePath = HttpContext.Current.Server.MapPath(filePath);//路径
21 string fileName = Path.GetFileName(filePath);//客户端保存的文件名
22 var response = HttpContext.Current.Response;
23 System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);
24 if (fileInfo.Exists == true)
25 {
26 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
27
28 byte[] buffer = new byte[ChunkSize];
29
30 response.Clear();
31 System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);
32 long dataLengthToRead = iStream.Length;//获取下载的文件总大小
33 response.ContentType = "application/octet-stream";
34 response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName));
35 while (dataLengthToRead > 0 && response.IsClientConnected)
36 {
37 //读取的大小 Response.OutputStream.Write(buffer, 0, lengthRead);
38 int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));
39 response.Flush();
40 dataLengthToRead = dataLengthToRead - lengthRead;
41 }
42
43 response.Close();
44 }
45 }
46
47 /// <summary>
48 /// 流方式下载
49 /// </summary>
50 /// <param name="filePath"></param>
51 public static void DownloadFileStream(string filePath)
52 {
53 filePath = HttpContext.Current.Server.MapPath(filePath);//路径
54 string fileName = Path.GetFileName(filePath);//客户端保存的文件名
55 var response = HttpContext.Current.Response;
56 FileStream fs = new FileStream(filePath, FileMode.Open);
57
58 byte[] bytes = new byte[(int)fs.Length]; fs.Read(bytes, 0, bytes.Length);
59
60 fs.Close();
61 response.ContentType = "application/octet-stream";
62 //通知浏览器下载文件而不是打开
63 response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
64 response.BinaryWrite(bytes);
65 response.Flush();
66 response.End();
67 }
68
69 /// <summary>
70 /// 将文本作为某文件下载
71 /// </summary>
72 /// <param name="text"></param>
73 /// <param name="fileName"></param>
74 public static void DownloadText(string text , string fileName)
75 {
76 byte[] bytes = Encoding.Default.GetBytes(text);
77 var response = HttpContext.Current.Response;
78 response.ContentType = "application/octet-stream";
79 //通知浏览器下载文件而不是打开
80 response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
81 response.BinaryWrite(bytes);
82 response.Flush();
83 response.End();
84 }
