ブラウザでFTPからファイルをダウンロード
19190 ワード
1 public static class FTPHelper
2 {
3 /// <summary>
4 /// FTP
5 /// </summary>
6 /// <param name="uri">ftp://{username}:{password}@ftp.baidu.com/{folderName}</param>
7 public static List<String> ListFiles(Uri serverUri)
8 {
9 // The serverUri parameter should start with the ftp:// scheme.
10 if (serverUri.Scheme != Uri.UriSchemeFtp)
11 {
12 throw new ArgumentException("uri must be ftp scheme");
13 }
14
15 FtpWebRequest ftpRequest = null;
16 StreamReader reader = null;
17 try
18 {
19 // Get the object used to communicate with the server.
20 ftpRequest = (FtpWebRequest)FtpWebRequest.Create(serverUri);
21
22 ftpRequest.Method = WebRequestMethods.Ftp.ListDirectory;
23
24 reader = new StreamReader(ftpRequest.GetResponse().GetResponseStream(), Encoding.Default);
25
26 //read data.
27 List<String> fileNames = new List<String>();
28 string line = reader.ReadLine();
29 while (line != null)
30 {
31
32 fileNames.Add(line);
33 line = reader.ReadLine();
34 }
35
36 return fileNames;
37
38 }
39 catch(Exception ex)
40 {
41 throw ex;
42 }
43 finally
44 {
45 if(reader != null)
46 {
47 reader.Close();
48 }
49 if (ftpRequest != null)
50 {
51 ftpRequest.Abort();
52 }
53 }
54 }
55
56 /// <summary>
57 ///
58 /// </summary>
59 /// <param name="uri">ftp://{username}:{password}@ftp.baidu.com/{fileName}</param>
60 public static long GetFileSize(Uri serverUri)
61 {
62 // The serverUri parameter should start with the ftp:// scheme.
63 if (serverUri.Scheme != Uri.UriSchemeFtp)
64 {
65 throw new ArgumentException("uri must be ftp scheme");
66 }
67
68 FtpWebRequest ftpRequest = null;
69 StreamReader reader = null;
70 try
71 {
72 // Get the object used to communicate with the server.
73 ftpRequest = (FtpWebRequest)FtpWebRequest.Create(serverUri);
74
75 ftpRequest.Method = WebRequestMethods.Ftp.GetFileSize;
76
77 return ftpRequest.GetResponse().ContentLength;
78 }
79 catch (Exception ex)
80 {
81 throw ex;
82 }
83 finally
84 {
85 if (reader != null)
86 {
87 reader.Close();
88 }
89 if (ftpRequest != null)
90 {
91 ftpRequest.Abort();
92 }
93 }
94 }
95 }ListFileメソッドを呼び出してFTP特定ディレクトリのすべてのファイルリストをwebページに表示し、名前をクリックするとファイルをダウンロードする
/// <summary>
/// （ Controller MVC Controller ）
/// </summary>
/// <param name="uri"></param>
public void DownLoadFile(Uri uri,string fileName)
{
//Create a stream for the file
Stream stream = null;
//This controls how many bytes to read at a time and send to the client
int bytesToRead = 10000;
// Buffer to read bytes in chunk size specified above
byte[] buffer = new Byte[bytesToRead];
// The number of bytes read
try
{
long fileSize = FTPHelper.GetFileSize(uri);
//Create a WebRequest to get the file
FtpWebRequest fileReq = (FtpWebRequest)FtpWebRequest.Create(uri);
//Create a response for this request
FtpWebResponse fileResp = (FtpWebResponse)fileReq.GetResponse();
//Get the Stream returned from the response
stream = fileResp.GetResponseStream();
// prepare the response to the client. resp is the client Response
var resp = HttpContext.Response;
//Indicate the type of data being sent
resp.ContentType = "application/octet-stream";
//Name the file
resp.AddHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
resp.AddHeader("Content-Length", fileSize.ToString());
int length;
do
{
// Verify that the client is connected.
if (resp.IsClientConnected)
{
// Read data into the buffer.
length = stream.Read(buffer, 0, bytesToRead);
// and write it out to the response's output stream
resp.OutputStream.Write(buffer, 0, length);
// Flush the data
resp.Flush();
//Clear the buffer
buffer = new Byte[bytesToRead];
}
else
{
// cancel the download if client has disconnected
length = -1;
}
} while (length > 0); //Repeat until no data is read
}
finally
{
if (stream != null)
{
//Close the input stream
stream.Close();
}
}
}