从Ftp服务器vb.net获取文件 [英] fetching files from Ftp server vb.net
问题描述
嗨
我目前正在运行一个进程，从服务器获取文件并导入数据库。
所以当用户单击按钮执行以下代码
Hi
I currently am running a process where files are fetch from a sever and imported into the database.
So when a user clicks the button the following code is executed
Dim host As String = "ftp://*/**/**/***/****"
Dim username As String = "*********"
Dim password As String = "*******"
Dim fwr As Net.FtpWebRequest = CType(Net.FtpWebRequest.Create(host), FtpWebRequest)
fwr.Credentials = New NetworkCredential(username, password)
fwr.KeepAlive = True
fwr.Method = WebRequestMethods.Ftp.ListDirectory
Dim filename As String
Dim mydocpath As String = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)
Dim sr As StreamReader = Nothing
Dim reqFTP As FtpWebRequest = CType(Net.FtpWebRequest.Create(host), FtpWebRequest)
Dim ftpStream As Stream = Nothing
Try
sr = New StreamReader(fwr.GetResponse().GetResponseStream())
Do Until (sr.EndOfStream())
filename = sr.ReadLine()
Dim filepath As String = (Me.Page.Server.MapPath("..\MyFolder\" + filename + ".txt"))
Dim outputStream As New FileStream(filepath, FileMode.Create)
reqFTP = DirectCast(FtpWebRequest.Create(New Uri(host + "/" + filename)), FtpWebRequest)
reqFTP.Credentials = New NetworkCredential(username, password)
reqFTP.KeepAlive = True
reqFTP.Method = WebRequestMethods.Ftp.DownloadFile
reqFTP.UseBinary = True
Dim response As FtpWebResponse = DirectCast(reqFTP.GetResponse(), FtpWebResponse)
ftpStream = response.GetResponseStream()
Dim cl As Long = response.ContentLength
Dim bufferSize As Integer = 2048
Dim readCount As Integer
Dim buffer As Byte() = New Byte(bufferSize - 1) {}
readCount = ftpStream.Read(buffer, 0, bufferSize)
While readCount > 0
outputStream.Write(buffer, 0, readCount)
readCount = ftpStream.Read(buffer, 0, bufferSize)
End While
ftpStream.Close()
outputStream.Close()
response.Close()
'Using outfile As StreamWriter = New StreamWriter(mydocpath + "\" & filename & ".txt", True)
'reqFTP.Method = WebRequestMethods.Ftp.DeleteFile
'End Using
'Dim sr2 As StreamReader = Nothing
'Try
' sr2 = New StreamReader(fwr.GetResponse().GetResponseStream())
' outfile = sr2.ReadToEnd()
'Catch ex As Exception
'End Try
'If (Not sr2 Is Nothing) Then sr2.Close() : sr2 = Nothing
'Delete FTP files from FTP Server
Dim FTPRequest As FtpWebRequest = CType(Net.WebRequest.Create(host), FtpWebRequest)
FTPRequest = DirectCast(FtpWebRequest.Create(New Uri(host + "/" + filename)), FtpWebRequest)
FTPRequest.Credentials = New System.Net.NetworkCredential(username, password)
FTPRequest.KeepAlive = True
FTPRequest.Method = WebRequestMethods.Ftp.DeleteFile
Dim ftpResponse As FtpWebResponse = DirectCast(FTPRequest.GetResponse(), FtpWebResponse)
Loop
Catch ex As Exception
End Try
'Try
' 'myFtpWebRequest.Credentials = New NetworkCredential("username", "password")
' reqFTP.Method = WebRequestMethods.Ftp.DeleteFile
'Catch ex As Exception
'End Try
If (Not sr Is Nothing) Then sr.Close() : sr = Nothing
If (Not fwr Is Nothing) Then fwr = Nothing
Dim strFileSize As String = ""
Dim di As New DirectoryInfo(Me.Page.Server.MapPath("..\MyserverFolder"))
Dim aryFi As FileInfo() = di.GetFiles("*.txt")
Dim fi As FileInfo
Dim sConnStr As String = ConfigurationManager.AppSettings("myConnectionString")
Dim cn As New System.Data.SqlClient.SqlConnection(sConnStr)
Dim cmdInsertInto As New System.Data.SqlClient.SqlCommand("", cn)
cmdInsertInto.CommandType = System.Data.CommandType.Text
cmdInsertInto.CommandTimeout = 0
Dim count As Integer = 0
' LblImport.Text = "Import in progress ...)"
For Each fi In aryFi
cn.Open()
' '' strFileSize = (Math.Round(fi.Length / 1024)).ToString()
' '' Console.WriteLine("File Name: {0}", fi.Name)
' '' Console.WriteLine("File Full Name: {0}", fi.FullName)
' '' Console.WriteLine("File Size (KB): {0}", strFileSize)
' '' Console.WriteLine("File Extension: {0}", fi.Extension)
' '' Console.WriteLine("Last Accessed: {0}", fi.LastAccessTime)
' '' Console.WriteLine("Read Only: {0}", (fi.Attributes.ReadOnly = True).ToString)
'Dim saveLocation As String = Page.Session.Item("saveLocation").ToString
'If saveLocation <> "" Then
'Opening the file
Dim file As New FileStream(fi.FullName, FileMode.Open, FileAccess.Read)
'Creating a strem to read the file into text
Dim stream As New StreamReader(file)
'Read the entire file, split it into line arrays by CRLF, and loop through it.
'''''''''''''''''''''CANNOT TRUNCATE !!!!!!!!!!!!! <----- Else Data will be lost....
' ''cmdInsertInto.CommandText = "Truncate table " & ConfigurationManager.AppSettings("BankFileTempTable")
' ''cmdInsertInto.ExecuteNonQuery()
Dim strReqLine As String = Replace(stream.ReadLine(), "'", "")
Dim fileStrings() As String = fi.Name.ToString.Split(("_").ToCharArray)
Dim FileOrderType As String = fileStrings(0) & fileStrings(1)
Dim FileDesig As String = fileStrings(1)
Dim FilePostingDate As String = fileStrings(2).TrimEnd((".txt").ToCharArray)
'Dim intPos As Integer = fileStrings
Dim sFieldsIn() As String = strReqLine.ToString.Split((",").ToCharArray)
Try
While Not strReqLine Is Nothing
If sFieldsIn(0) = "Sales Document Type" Then
Else
'* Code to parse the line for data
'
'cmdInsertInto.CommandText = "INSERT INTO " & ConfigurationManager.AppSettings("BankFileTempTable") & " (BulkColumn) VALUES ('" & strReqLine.Replace("'", "") & "')"
cmdInsertInto.CommandText = "INSERT INTO " & ConfigurationManager.AppSettings("ImportTable") & " ([column1],[column2],[column3]" & _
",[column4],[column5] ,[column6],[column7] ,[column8]" & _
",[column9],[column10] ,[column11],[column12],[column13]" & _
",[NameOfPersonReportingNotification],[column14],[column15]" & _
",[column16] ,[column17]) " & _
" VALUES ('" & fi.Name.ToString & "','" & fileStrings(3) & "','" & "','" & sFieldsIn(0) & _
"','" & sFieldsIn(1) & "','" & sFieldsIn(2) & "','" & sFieldsIn(3) & "','" & sFieldsIn(4) & "','" & sFieldsIn(5) & _
"','" & sFieldsIn(6) & "','" & sFieldsIn(7) & "','" & sFieldsIn(8) & "','" & sFieldsIn(9) & "','" & sFieldsIn(10) & _
"','" & sFieldsIn(11) & "','" & sFieldsIn(12) & "','" & sFieldsIn(13) & "','" & sFieldsIn(14) & "')"
cmdInsertInto.ExecuteNonQuery()
'If count = 10000 Then
' Exit While
'End If
End If
strReqLine = Replace(stream.ReadLine(), "'", "")
If strReqLine Is Nothing Then
Else
sFieldsIn = strReqLine.ToString.Split((",").ToCharArray)
End If
count += 1
End While
stream.Close()
fi.MoveTo(fi.FullName.TrimEnd((".txt").ToCharArray) & ".old")
cn.Close()
Catch ex As Exception
cmdInsertInto.CommandText = "DELETE FROM " & ConfigurationManager.AppSettings("ImportTable") & " where [FileDescription] = '" & fi.Name.ToString & "'"
cmdInsertInto.ExecuteNonQuery()
'LblImport.Text = " Import was successful but with errors. Please review the *.error file/s in the ...\Myserverfolder and correct the exceptions. Then rename the file back to .txt and re-run the import!"
stream.Close()
fi.MoveTo(fi.FullName.TrimEnd((".txt").ToCharArray) & ".error")
cn.Close()
End Try
Next
' If LblImport.Text = "Import in progress ...)" Then
'LblImport.Text = " Import was successful"
' End If
End Sub
I am trying to automate this code to be executed every 24 hours
so i have added a timmer in the Global.asax page
this is my code for the timmer
I am trying to automate this code to be executed every 24 hours
so i have added a timmer in the Global.asax page
this is my code for the timmer
Dim timer As New System.Timers.Timer()
timer.Enabled = True
timer.Start()
'300000 equals 5 minutes
Dim interval As Double = 86400000
timer.Interval = interval
AddHandler timer.Elapsed, AddressOf OnElapsedTime
and in the sub OnElapsedTime i have the code above for the import that i use on the button
the issue i am getting is that in the global.asax i ge t an error on this line
Dim filepath As String = (Me.Page.Server.MapPath(\"..\MyFolder\\" + filename + \".txt\"))
i have tried Dim filepath As String = (Me.Server.MapPath(\"..\MyFolder\\" + filename + \".txt\"))
as well as Dim filepath As String = (Server.MapPath(\"..\MyFolder\\" + filename + \".txt\"))
the error is \"Server operation is not available in this context.\"
Please could someone assist
and in the sub OnElapsedTime i have the code above for the import that i use on the button
the issue i am getting is that in the global.asax i get an error on this line
Dim filepath As String = (Me.Page.Server.MapPath("..\MyFolder\" + filename + ".txt"))
i have tried Dim filepath As String = (Me.Server.MapPath("..\MyFolder\" + filename + ".txt"))
as well as Dim filepath As String = (Server.MapPath("..\MyFolder\" + filename + ".txt"))
the error is "Server operation is not available in this context."
Please could someone assist
推荐答案
The larger question is: why are you trying to run a scheduled process from your web server? I would think it would be easier to run it as a separate process, with isolated code.
Anyway, the problem might be that the code is running somewhere other than a page. On my websites, I add the following module:
The larger question is: why are you trying to run a scheduled process from your web server? I would think it would be easier to run it as a separate process, with isolated code.
Anyway, the problem might be that the code is running somewhere other than a page. On my websites, I add the following module:
Friend Module General
Public Function Application() As HttpApplicationState
Return HttpContext.Current.Application
End Function
Public Function Request() As HttpRequest
Return HttpContext.Current.Request
End Function
Public Function Response() As HttpResponse
Return HttpContext.Current.Response
End Function
Public Function Server() As HttpServerUtility
Return HttpContext.Current.Server
End Function
Public Function Session() As HttpSessionState
Return HttpContext.Current.Session
End Function
End ModuleThis lets me use properties like Request or Server in situations where it is not otherwise available. Using the Friend keyword limits these function to App_Code, so they will not interfere with what is on a page. You can, of course, forget the module and just use something like HttpContext.Current.Server directly.
This lets me use properties like Request or Server in situations where it is not otherwise available. Using the Friend keyword limits these function to App_Code, so they will not interfere with what is on a page. You can, of course, forget the module and just use something like HttpContext.Current.Server directly.
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