1// 输出硬盘文件,提供下载 支持大文件、续传、速度限制、资源占用小
2 // 输入参数 _Request: Page.Request对象, _Response: Page.Response对象, _fileName: 下载文件名, _fullPath: 带文件名下载路径, _speed 每秒允许下载的字节数
3 // 返回是否成功
4 public static bool ResponseFile(HttpRequest _Request,HttpResponse _Response,string _fileName,string _fullPath, long _speed)
5 {
6 try
7 {
8 FileStream myFile = new FileStream(_fullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
9 BinaryReader br = new BinaryReader(myFile);
10 try
11 {
12 _Response.AddHeader("Accept-Ranges", "bytes");
13 _Response.Buffer = false;
14 long fileLength = myFile.Length;
15 long startBytes = 0;
16
17 int pack = 102400; //10K bytes
18 //int sleep = 200; //每秒5次 即5*10K bytes每秒
19 int sleep = (int)Math.Floor(1000 * pack / _speed) + 1;
20 if (_Request.Headers["Range"] != null)
21 {
22 _Response.StatusCode = 206;
23 string[] range = _Request.Headers["Range"].Split(new char[] {'=', '-'});
24 startBytes = Convert.ToInt64(range[1]);
25 }
26 _Response.AddHeader("Content-Length", (fileLength - startBytes).ToString());
27 if (startBytes != 0)
28 {
29 _Response.AddHeader("Content-Range", string.Format(" bytes {0}-{1}/{2}", startBytes, fileLength-1, fileLength));
30 }
31 _Response.AddHeader("Connection", "Keep-Alive");
32 _Response.ContentType = "application/octet-stream";
33 _Response.AddHeader("Content-Disposition","attachment;filename=" + HttpUtility.UrlEncode(_fileName,System.Text.Encoding.UTF8) );
34
35 br.BaseStream.Seek(startBytes, SeekOrigin.Begin);
36 int maxCount = (int) Math.Floor((fileLength - startBytes) / pack) + 1;
37
38 for (int i = 0; i < maxCount; i++)
39 {
40 if (_Response.IsClientConnected)
41 {
42 _Response.BinaryWrite(br.ReadBytes(pack));
43 Thread.Sleep(sleep);
44 }
45 else
46 {
47 i=maxCount;
48 }
49 }
50 }
51 catch
52 {
53 return false;
54 }
55 finally
56 {
57 br.Close();
58 myFile.Close();
59 }
60 }
61 catch
62 {
63 return false;
64 }
65 return true;
66 }
2 // 输入参数 _Request: Page.Request对象, _Response: Page.Response对象, _fileName: 下载文件名, _fullPath: 带文件名下载路径, _speed 每秒允许下载的字节数
3 // 返回是否成功
4 public static bool ResponseFile(HttpRequest _Request,HttpResponse _Response,string _fileName,string _fullPath, long _speed)
5 {
6 try
7 {
8 FileStream myFile = new FileStream(_fullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
9 BinaryReader br = new BinaryReader(myFile);
10 try
11 {
12 _Response.AddHeader("Accept-Ranges", "bytes");
13 _Response.Buffer = false;
14 long fileLength = myFile.Length;
15 long startBytes = 0;
16
17 int pack = 102400; //10K bytes
18 //int sleep = 200; //每秒5次 即5*10K bytes每秒
19 int sleep = (int)Math.Floor(1000 * pack / _speed) + 1;
20 if (_Request.Headers["Range"] != null)
21 {
22 _Response.StatusCode = 206;
23 string[] range = _Request.Headers["Range"].Split(new char[] {'=', '-'});
24 startBytes = Convert.ToInt64(range[1]);
25 }
26 _Response.AddHeader("Content-Length", (fileLength - startBytes).ToString());
27 if (startBytes != 0)
28 {
29 _Response.AddHeader("Content-Range", string.Format(" bytes {0}-{1}/{2}", startBytes, fileLength-1, fileLength));
30 }
31 _Response.AddHeader("Connection", "Keep-Alive");
32 _Response.ContentType = "application/octet-stream";
33 _Response.AddHeader("Content-Disposition","attachment;filename=" + HttpUtility.UrlEncode(_fileName,System.Text.Encoding.UTF8) );
34
35 br.BaseStream.Seek(startBytes, SeekOrigin.Begin);
36 int maxCount = (int) Math.Floor((fileLength - startBytes) / pack) + 1;
37
38 for (int i = 0; i < maxCount; i++)
39 {
40 if (_Response.IsClientConnected)
41 {
42 _Response.BinaryWrite(br.ReadBytes(pack));
43 Thread.Sleep(sleep);
44 }
45 else
46 {
47 i=maxCount;
48 }
49 }
50 }
51 catch
52 {
53 return false;
54 }
55 finally
56 {
57 br.Close();
58 myFile.Close();
59 }
60 }
61 catch
62 {
63 return false;
64 }
65 return true;
66 }