'Visual Basic.Net JingCai Programming 100 Examples
'Author: Yong Zhang
'Publisher: Water Publisher China
'ISBN: 750841156
Imports System.Net
Imports System.Net.Sockets
Imports System.Threading
Imports System.Text
Imports System.IO
Public Class WebServer
Public Shared Sub Main()
Dim serverSocket As System.Net.Sockets.Socket
Try
Dim hostName As String = Dns.GetHostName()
Dim serverIP As IPAddress = Dns.Resolve(hostName).AddressList(0)
' Web Server Port = 80
Dim Port As String = "80"
Dim serverHost As New IPEndPoint(serverIP, Int32.Parse(Port))
serverSocket = New Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)
serverSocket.Bind(serverHost)
' Backlog = 50
serverSocket.Listen(50)
Console.WriteLine("Web server started at: " & serverHost.Address.ToString() & ":" & Port)
Dim httpSession As New HTTPSession(serverSocket)
Dim serverThread As New Thread(New ThreadStart(AddressOf httpSession.ProcessThread))
serverThread.Start()
Catch ex As Exception
Console.WriteLine(ex.StackTrace.ToString())
End Try
End Sub
End Class
Public Class HTTPSession
Private serverSocket As System.Net.Sockets.Socket
Private clientSocket As System.Net.Sockets.Socket
Public Sub New(ByVal serverSocket As System.Net.Sockets.Socket)
Me.serverSocket = serverSocket
End Sub
Public Sub ProcessThread()
While (True)
Try
clientSocket = serverSocket.Accept()
' Socket Information
Dim clientInfo As IPEndPoint = CType(clientSocket.RemoteEndPoint, IPEndPoint)
Dim serverInfo As IPEndPoint = CType(serverSocket.LocalEndPoint, IPEndPoint)
Console.WriteLine("Client: " + clientInfo.Address.ToString() + ":" + clientInfo.Port.ToString())
Console.WriteLine("Server: " + serverInfo.Address.ToString() + ":" + serverInfo.Port.ToString())
' Set Thread for each Web Browser Connection
Dim clientThread As New Thread(New ThreadStart(AddressOf ProcessRequest))
clientThread.Start()
Catch ex As Exception
Console.WriteLine(ex.StackTrace.ToString())
If clientSocket.Connected Then
clientSocket.Close()
End If
End Try
End While
End Sub
Protected Sub ProcessRequest()
Dim recvBytes(1024) As Byte
Dim htmlReq As String = Nothing
Dim bytes As Int32
Try
' Receive HTTP Request from Web Browser
bytes = clientSocket.Receive(recvBytes, 0, clientSocket.Available, SocketFlags.None)
htmlReq = Encoding.ASCII.GetString(recvBytes, 0, bytes)
Console.WriteLine("HTTP Request: ")
Console.WriteLine(htmlReq)
' Set WWW Root Path
Dim rootPath As String = Directory.GetCurrentDirectory() & "\WWWRoot\"
' Set default page
Dim defaultPage As String = "index.html"
Dim strArray() As String
Dim strRequest As String
strArray = htmlReq.Trim.Split(" ")
' Determine the HTTP method (GET only)
If strArray(0).Trim().ToUpper.Equals("GET") Then
strRequest = strArray(1).Trim
If (strRequest.StartsWith("/")) Then
strRequest = strRequest.Substring(1)
End If
If (strRequest.EndsWith("/") Or strRequest.Equals("")) Then
strRequest = strRequest & defaultPage
End If
strRequest = rootPath & strRequest
sendHTMLResponse(strRequest)
Else ' Not HTTP GET method
strRequest = rootPath & "Error\" & "400.html"
sendHTMLResponse(strRequest)
End If
Catch ex As Exception
Console.WriteLine(ex.StackTrace.ToString())
If clientSocket.Connected Then
clientSocket.Close()
End If
End Try
End Sub
' Send HTTP Response
Private Sub sendHTMLResponse(ByVal httpRequest As String)
Try
' Get the file content of HTTP Request
Dim streamReader As StreamReader = New StreamReader(httpRequest, Encoding.Default)
Dim strBuff As String = streamReader.ReadToEnd()
streamReader.Close()
streamReader = Nothing
' The content Length of HTTP Request
Dim respByte() As Byte = Encoding.Default.GetBytes(strBuff)
' Set HTML Header
Dim htmlHeader As String = _
"HTTP/1.0 200 OK" & ControlChars.CrLf & _
"Server: WebServer 1.0" & ControlChars.CrLf & _
"Content-Length: " & respByte.Length & ControlChars.CrLf & _
"Content-Type: " & getContentType(httpRequest) & _
ControlChars.CrLf & ControlChars.CrLf
' The content Length of HTML Header
Dim headerByte() As Byte = Encoding.ASCII.GetBytes(htmlHeader)
Console.WriteLine("HTML Header: " & ControlChars.CrLf & htmlHeader)
' Send HTML Header back to Web Browser
clientSocket.Send(headerByte, 0, headerByte.Length, SocketFlags.None)
' Send HTML Content back to Web Browser
clientSocket.Send(respByte, 0, respByte.Length, SocketFlags.None)
' Close HTTP Socket connection
clientSocket.Shutdown(SocketShutdown.Both)
clientSocket.Close()
Catch ex As Exception
Console.WriteLine(ex.StackTrace.ToString())
If clientSocket.Connected Then
clientSocket.Close()
End If
End Try
End Sub
' Get Content Type
Private Function getContentType(ByVal httpRequest As String) As String
If (httpRequest.EndsWith("html")) Then
Return "text/html"
ElseIf (httpRequest.EndsWith("htm")) Then
Return "text/html"
ElseIf (httpRequest.EndsWith("txt")) Then
Return "text/plain"
ElseIf (httpRequest.EndsWith("gif")) Then
Return "image/gif"
ElseIf (httpRequest.EndsWith("jpg")) Then
Return "image/jpeg"
ElseIf (httpRequest.EndsWith("jpeg")) Then
Return "image/jpeg"
ElseIf (httpRequest.EndsWith("pdf")) Then
Return "application/pdf"
ElseIf (httpRequest.EndsWith("pdf")) Then
Return "application/pdf"
ElseIf (httpRequest.EndsWith("doc")) Then
Return "application/msword"
ElseIf (httpRequest.EndsWith("xls")) Then
Return "application/vnd.ms-excel"
ElseIf (httpRequest.EndsWith("ppt")) Then
Return "application/vnd.ms-powerpoint"
Else
Return "text/plain"
End If
End Function
End Class