Imports System Imports System.Net Imports System.IO Imports System.Text Imports System.Net.Sockets Public Class Class1 Public Const BLOCK_SIZE = 512 Private Obj_ClientSocket As Socket Private Str_Domain As String = "XXX" 'ftp服务器地址 Private Str_User As String = "XXX" 'ftp登陆帐号 Private Str_Password As String = "XXX" 'ftp登陆密码 Private Int_RemotePort As Integer = 21 'ftp服务器端口 Private Int_Reply,Int_Bytes As Int32 Private Str_Message,Str_Reply As String Private Byte_Buffer(BLOCK_SIZE) As Byte Private ASCII As Encoding = Encoding.ASCII Public Function Logined() As Boolean Obj_ClientSocket = New Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp) Dim x_lob As New IPEndPoint(Dns.GetHostEntry(Str_Domain).AddressList(0),Int_RemotePort) Try Obj_ClientSocket.Connect(x_lob) Catch ex As Exception MsgBox("无法登陆远程Ftp服务器") End Try Str_Message = "" Str_Reply = ServerReply() Int_Reply = Int32.Parse(Str_Reply.Substring(0,3)) If (Int_Reply <> 220) Then MsgBox(Str_Reply.Substring(4)) End If SendCommand("USER " & Str_User) Str_Reply = ServerReply(True) Int_Reply = Int32.Parse(Str_Reply.Substring(0,3)) If (Not (Int_Reply = 331 Or Int_Reply = 230)) Then MsgBox(Str_Reply.Substring(4)) Return False End If If (Int_Reply <> 230) Then SendCommand("PASS " & Str_Password) Str_Reply = ServerReply(True) Int_Reply = Int32.Parse(Str_Reply.Substring(0,3)) If (Not (Int_Reply = 230 Or Int_Reply = 202)) Then MsgBox(Str_Reply.Substring(4)) Return False End If End If Return True End Function Private Function ServerReply(Optional ByVal Bool_Clear As Boolean = False) As String Dim Sep As Char = ControlChars.Lf Dim Arr_Msg() As String If (Bool_Clear) Then Str_Message = "" End If Do While (True) Array.Clear(Byte_Buffer,BLOCK_SIZE) Int_Bytes = Obj_ClientSocket.Receive(Byte_Buffer,Byte_Buffer.Length,0) Str_Message += ASCII.GetString(Byte_Buffer,Int_Bytes) If (Int_Bytes < Byte_Buffer.Length) Then Exit Do End If Loop Arr_Msg = Str_Message.Split(Sep) If (Str_Message.Length > 2) Then Str_Message = Arr_Msg(Arr_Msg.Length - 2) Else Str_Message = Arr_Msg(0) End If If (Not (Str_Message.Substring(3,1).Equals(" "))) Then Return ServerReply(True) End If Return Str_Message End Function Private Sub SendCommand(ByVal Str_Command As String) Str_Command = Str_Command & ControlChars.CrLf Dim cmdbytes As Byte() = ASCII.GetBytes(Str_Command) Obj_ClientSocket.Send(cmdbytes,cmdbytes.Length,0) End Sub End Class
网上找到的一个VB.NET的FTP类文件,能够不错的兼容使用,但是还是存在一些问题,现在整合在AspCms内容管理器上,在寒假里希望能进行一下改进,加入上传下载的功能。