有位网友发贴问我一个聊天的问题，不好拒绝；也看到最近VB.net版问这个的人很多，就写了一个放在这里。
本例只适合初学用Socket编程的人，因而力求简单，让老鸟见笑了J
另本示例用的是vs2005
1、服务端
ImportsSystem.Net
ImportsSystem.Net.Sockets
ImportsSystem.Threading
ImportsSystem.Text
ImportsSystem.Diagnostics
PublicClass frmServer
'服务端的Socket
Dim listener As Socket
'与客户端会话的Socket
Dim mySocket As Socket
'服务端的运行状态
Dim IsRun As Boolean = False
'监听接收数据线程
Dim myThread As Thread
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
myThread = New Thread(AddressOf Listen)
myThread.Start()
End Sub
Public Sub Listen()
Dim bytes() As Byte = New [Byte](1024) {}
Dim data As String = String.Empty
Dim tokens() As String
Dim localEndPoint As New IPEndPoint(Net.IPAddress.Parse("127.0.0.1"), 11000)
'初始化socket
listener = New Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)
'绑定端口
listener.Bind(localEndPoint)
'开始监听
listener.Listen(10)
BeginInvoke(New EventHandler(AddressOf AddInfo), "服务端已启动，正在等待连接......")
mySocket = listener.Accept()
IsRun = True
While True
Dim bytesRec As Integer = mySocket.Receive(bytes)
data = Encoding.UTF8.GetString(bytes, 0, bytesRec)
tokens = data.Trim.Split("|")
Select Case tokens(0) '分析接收到的数据，可自己定义更多一些
Case "Chat"
BeginInvoke(New EventHandler(AddressOf AddInfo), tokens(1)) 'Invoke保证线程安全
Case "Exit"
IsRun = False
BeginInvoke(New EventHandler(AddressOf AddInfo), tokens(1)) 'Invoke保证线程安全
mySocket.Shutdown(SocketShutdown.Both)
mySocket.Close()
Exit Sub
End Select
End While
End Sub
'发送信息
Private Sub btnSend_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSend.Click
Dim msg As Byte() = Encoding.UTF8.GetBytes("Chat|" + TextBox1.Text)
mySocket.Send(msg)
ListBox1.Items.Add("本地信息: " + TextBox1.Text)
TextBox1.Text = ""
End Sub
'非UI线程调用窗体控件，保证线程安全。与聊天实现无关。
Sub AddInfo(ByVal sender As System.Object, ByVal e As System.EventArgs)
ListBox1.Items.Add("远程信息: " + sender.ToString)
End Sub
'关闭窗口时发关退出信息并清理资源
Private Sub Form1_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
If IsRun Then
Dim msg As Byte() = Encoding.UTF8.GetBytes("Exit|服务端退出: " + Me.Handle.ToString)
Dim bytesSent As Integer = mySocket.Send(msg)
End If
listener.Close()
mySocket = Nothing
myThread.Abort()
End Sub
EndClass
2、客户端
ImportsSystem.Net
ImportsSystem.Net.Sockets
ImportsSystem.Text
ImportsSystem.Threading
PublicClass frmClient
'客户端Socket
Dim cliSocket As Socket
'连接状态
Dim IsConnected As Boolean = False
'接收信息线程
Dim myThread As Thread
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim remoteEP As New IPEndPoint(Net.IPAddress.Parse("127.0.0.1"), 11000)
cliSocket = New Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)
Try
cliSocket.Connect(remoteEP)
ListBox1.Items.Add("连接服务端成功!")
IsConnected = True
myThread = New Thread(AddressOf ReciveMsg)
myThread.Start()
Catch ex As Exception
ListBox1.Items.Add(ex.Message)
End Try
End Sub
Sub ReciveMsg()
Dim bytes() As Byte = New Byte(1024) {}
Dim data As String = String.Empty
Dim tokens() As String
While True
Dim bytesRec As Integer = cliSocket.Receive(bytes)
data = Encoding.UTF8.GetString(bytes, 0, bytesRec)
tokens = data.Trim.Split("|")
Select Case tokens(0) '分析接收到的数据，可自己定义更多一些
Case "Exit"
IsConnected = False
BeginInvoke(New EventHandler(AddressOf AddInfo), tokens(1)) 'Invoke保证线程安全
cliSocket.Shutdown(SocketShutdown.Both)
cliSocket.Close()
Exit Sub
Case "Chat"
BeginInvoke(New EventHandler(AddressOf AddInfo), tokens(1)) 'Invoke保证线程安全
End Select
End While
End Sub
'发送信息
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim msg As Byte() = Encoding.UTF8.GetBytes("Chat|" + TextBox1.Text)
Dim bytesSent As Integer = cliSocket.Send(msg)
ListBox1.Items.Add("本地信息: " + TextBox1.Text)
TextBox1.Text = ""
End Sub
'非UI线程调用窗体控件，保证线程安全。与聊天实现无关。
Sub AddInfo(ByVal sender As System.Object, ByVal e As System.EventArgs)
ListBox1.Items.Add("远程信息: " + sender.ToString)
End Sub
'关闭窗口时发关退出信息并清理资源
Private Sub Form1_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
If IsConnected Then
Dim msg As Byte() = Encoding.UTF8.GetBytes("Exit|客户端退出: " + Me.Handle.ToString)
Dim bytesSent As Integer = cliSocket.Send(msg)
myThread.Abort()
End If
End Sub
EndClass
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