MSDN上的,看看對你有沒有幫助。GOOD LUCK!
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Imports System.Net
Imports System.IO
Module FtpSample
Sub Main(ByVal args() As String)
If args.Length = 0 OrElse args(0).Equals("/?") Then
DisplayUsage()
ElseIf args.Length = 1 Then
Download(args(0))
ElseIf args.Length = 2 Then
If args(0).Equals("/list") Then
List(args(1))
Else
Upload(args(0), args(1))
End If
Else
Console.WriteLine("Unrecognized argument.")
End If
End Sub
Private Sub DisplayUsage()
Console.WriteLine("USAGE:")
Console.WriteLine(" FtpSample [/? | FTP download URL | local file")
Console.WriteLine(" FTP upload URL | /list FTP list URL]")
Console.WriteLine()
Console.WriteLine("where")
Console.WriteLine(" FTP download URL URL of a file to download from an FTP server.")
Console.WriteLine(" FTP upload URL Location on a FTP server to upload a file to.")
Console.WriteLine(" FTP list URL Location on a FTP server to list the contents of.")
Console.WriteLine(" local file A local file to upload to an FTP server.")
Console.WriteLine()
Console.WriteLine(" Options:")
Console.WriteLine(" /? Display this help message.")
Console.WriteLine(" /list Specifies the list command.")
Console.WriteLine()
Console.WriteLine("EXAMPLES:")
Console.WriteLine(" Download a file FtpSample ")
Console.WriteLine(" Upload a file FtpSample upload.txt ")
End Sub
Private Sub Download(ByVal downloadUrl As String)
Dim responseStream As Stream = Nothing
Dim fileStream As FileStream = Nothing
Dim reader As StreamReader = Nothing
Try
Dim downloadRequest As FtpWebRequest = _
WebRequest.Create(downloadUrl)
Dim downloadResponse As FtpWebResponse = _
downloadRequest.GetResponse()
responseStream = downloadResponse.GetResponseStream()
Dim fileName As String = _
Path.GetFileName(downloadRequest.RequestUri.AbsolutePath)
If fileName.Length = 0 Then
reader = New StreamReader(responseStream)
Console.WriteLine(reader.ReadToEnd())
Else
fileStream = File.Create(fileName)
Dim buffer(1024) As Byte
Dim bytesRead As Integer
While True
bytesRead = responseStream.Read(buffer, 0, buffer.Length)
If bytesRead = 0 Then
Exit While
End If
fileStream.Write(buffer, 0, bytesRead)
End While
End If
Console.WriteLine("Download complete.")
Catch ex As UriFormatException
Console.WriteLine(ex.Message)
Catch ex As WebException
Console.WriteLine(ex.Message)
Catch ex As IOException
Console.WriteLine(ex.Message)
Finally
If reader IsNot Nothing Then
reader.Close()
ElseIf responseStream IsNot Nothing Then
responseStream.Close()
End If
If fileStream IsNot Nothing Then
fileStream.Close()
End If
End Try
End Sub
Private Sub Upload(ByVal fileName As String, ByVal uploadUrl As String)
Dim requestStream As Stream = Nothing
Dim fileStream As FileStream = Nothing
Dim uploadResponse As FtpWebResponse = Nothing
Try
Dim uploadRequest As FtpWebRequest = WebRequest.Create(uploadUrl)
uploadRequest.Method = WebRequestMethods.
' UploadFile is not supported through an Http proxy
' so we disable the proxy for this request.
uploadRequest.Proxy = Nothing
requestStream = uploadRequest.GetRequestStream()
fileStream = File.Open(fileName, FileMode.Open)
Dim buffer(1024) As Byte
Dim bytesRead As Integer
While True
bytesRead = fileStream.Read(buffer, 0, buffer.Length)
If bytesRead = 0 Then
Exit While
End If
requestStream.Write(buffer, 0, bytesRead)
End While
' The request stream must be closed before getting the response.
requestStream.Close()
uploadResponse = uploadRequest.GetResponse()
Console.WriteLine("Upload complete.")
Catch ex As UriFormatException
Console.WriteLine(ex.Message)
Catch ex As IOException
Console.WriteLine(ex.Message)
Catch ex As WebException
Console.WriteLine(ex.Message)
Finally
If uploadResponse IsNot Nothing Then
uploadResponse.Close()
End If
If fileStream IsNot Nothing Then
fileStream.Close()
End If
If requestStream IsNot Nothing Then
requestStream.Close()
End If
End Try
End Sub
Private Sub List(ByVal listUrl As String)
Dim reader As StreamReader = Nothing
Try
Dim listRequest As FtpWebRequest = WebRequest.Create(listUrl)
listRequest.Method = WebRequestMethods.
Dim listResponse As FtpWebResponse = listRequest.GetResponse()
reader = New StreamReader(listResponse.GetResponseStream())
Console.WriteLine(reader.ReadToEnd())
Console.WriteLine("List complete.")
Catch ex As UriFormatException
Console.WriteLine(ex.Message)
Catch ex As WebException
Console.WriteLine(ex.Message)
Finally
If reader IsNot Nothing Then
reader.Close()
End If
End Try
End Sub
End Module
可以通過設置 Credentials 屬性來指定用于連接服務器的憑據,也可以將它們包含在傳遞給 Create 方法的 URI 的 UserInfo 部分中。
從 FTP 服務器下載文件時,如果命令成功,所請求的文件的內容即在響應對象的流中。通過調用 GetResponseStream 方法,可以訪問此流。
如果使用 FtpWebRequest 對象向服務器上載文件,則必須將文件內容寫入請求流,請求流是通過調用 GetRequestStream 方法或其異步對應方法(BeginGetRequestStream 和 EndGetRequestStream 方法)獲取的。必須寫入流并在發送請求之前關閉該流。
請求是通過調用 GetResponse 方法或其異步對應方法(BeginGetResponse 和 EndGetResponse 方法)發送到服務器的。請求的操作完成時,會返回一個 FtpWebResponse 對象。FtpWebResponse 對象提供操作的狀態以及從服務器下載的所有數據。
需要。
在實際使用FTP文件服務器的過程中,經常需要遠程下載解析文件。為提高效率,需要判斷文件存在與否,有選擇的進行解析。
FTP協議是一個用于在計算機網絡上客戶端和服務器之間進行文件傳輸的應用層協議,包括FTP服務器和FTP客戶端兩個組成部分。FTP能操作任何類型的文件而不需要進一步處理,但有著極高的延時,從開始請求到第一次接收需求數據之間的時間較長,并不時地執行一些冗長的登錄進程。
If My.Computer.Network.IsAvailable Then
'如果可用
Else
'不可用
End If
Public Sub DownloadFile ( _
address As Uri, _
destinationFileName As String, _
userName As String, _
password As String, _
showUI As Boolean, _
connectionTimeout As Integer, _
overwrite As Boolean, _
onUserCancel As UICancelOption _
)
參數
address
String 或 Uri。要下載的文件的路徑,包括文件名和主機地址。必選。
destinationFileName
String。下載文件的文件名和路徑。必選。
userName
String。要進行身份驗證的用戶名。默認值為空字符串 ""。
password
String。要進行身份驗證的密碼。默認值為空字符串 ""。
showUI
Boolean。指定是否顯示操作進度。默認為 False。
connectionTimeout
Int32。以毫秒為單位的超時間隔。默認值為 100 秒。
overwrite
Boolean。指定是否改寫現有文件。默認為 False。
onUserCancel
UICancelOption。指定當用戶在對話框(此對話框在 ShowUI 設置為 True 時顯示)上單擊“取消”或“否”時的行為。默認為 ThrowException。
給你個方法原型:
File.Copy("~\*.*","~\",Boolean)第一個參數是String,指定原文件的Path;
第二個參數是String,指定拷貝目標Path;
第三個參數是Boolean,表示覆蓋同名文件。
自己修改一下即可。
當前名稱:vb.net下用ftp vbnet web
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