最近公司安排我和另一个同事一起完成一个Socket通信服务器，多个Socket通信客户端，具体的是服务器在window系统下c#开发，客户端是在liunx系统下开发，实现交互通讯。Socket通信服务器启动时，Socket将侦听到的Socket连接传给接受Socket，然后由接受Socket完成接受、发送消息，当Socket存在异常时，断开连接。我负责服务器端功能，所以我这里简单说下我服务器的功能:

1、服务器一直监听当前客户端是否有连接

2、动态的保留当前有连接状态的客户端

3、服务器端和客户端进行交互数据

主函数

       public void StartListenUp()

        {

            IPAddress myIP = GetIPAddress();

            IPEndPoint localEndPoint = new IPEndPoint(myIP, _port);

            Socket listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

            try

            {

                listener.Bind(localEndPoint);

                listener.Listen(10);

                string userIP;

                while (true)

                {

                    Socket newClient = listener.Accept();

                    userIP = ((IPEndPoint)newClient.RemoteEndPoint).Address.ToString();

                    _transmit_IP.Add(userIP, newClient);

 

                    Thread clientThread = new Thread(new ParameterizedThreadStart(ThreadFun));

                    clientThread.Start(userIP);

                }

            }

            catch (Exception e)

            {

                Console.WriteLine(e.ToString());

            }

        }

/// 线程执行体,消息传递给线程执行体的用户名，用以与用户通信

        private void ThreadFun(object obj)

        {

            //通过转发表得到当前用户套接字

            Socket handler = _transmit_IP[obj] as Socket;

          // 业务处理

       }

以上是服务器的主要代码并已经和客户端测试通过

希望大家批评指正。。。

ps：听人劝吃饱饭，查看了微软最新异步通讯的例子调试了下

代码如下：

 public static void StartListening()

    {

        // Data buffer for incoming data.

        byte[] bytes = new Byte[1024];

        // Establish the local endpoint for the socket.

        // The DNS name of the computer

        // running the listener is "host.contoso.com".

        IPHostEntry ipHostInfo = Dns.GetHostEntry(Dns.GetHostName());

        IPAddress ipAddress = ipHostInfo.AddressList[0];

        IPEndPoint localEndPoint = new IPEndPoint(ipAddress, 11000);

        // Create a TCP/IP socket.

        Socket listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

        // Bind the socket to the local endpoint and listen for incoming connections.

        try

        {

            listener.Bind(localEndPoint);

            listener.Listen(100);

            while (true)

            {

                // Set the event to nonsignaled state.

                allDone.Reset();

                // Start an asynchronous socket to listen for connections.

                Console.WriteLine("Waiting for a connection...");

                listener.BeginAccept(new AsyncCallback(AcceptCallback), listener);

                // Wait until a connection is made before continuing.

                allDone.WaitOne();

            }

        }

        catch (Exception e)

        {

            Console.WriteLine(e.ToString());

        }

        Console.WriteLine("\nPress ENTER to continue...");

        Console.Read();

    }

    public static void AcceptCallback(IAsyncResult ar)

    {

        // Signal the main thread to continue.

        allDone.Set();

        // Get the socket that handles the client request.

        Socket listener = (Socket)ar.AsyncState;

        Socket handler = listener.EndAccept(ar);

        // Create the state object.

        StateObject state = new StateObject();

        state.workSocket = handler;

        handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(ReadCallback), state);

    }

    public static void ReadCallback(IAsyncResult ar)

    {

        String content = String.Empty;

        // Retrieve the state object and the handler socket from the asynchronous state object.

        StateObject state = (StateObject)ar.AsyncState;

        Socket handler = state.workSocket;

        // Read data from the client socket.

        int bytesRead = handler.EndReceive(ar);

        if (bytesRead > 0)

        {

            // There  might be more data, so store the data received so far.

            state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));

            // Check for end-of-file tag. If it is not there, read more data.

            content = state.sb.ToString();

            if (content.IndexOf("<EOF>") > -1)

            {

                // All the data has been read from the client. Display it on the console.

                Console.WriteLine("Read {0} bytes from socket. \n Data : {1}", content.Length, content);

                // Echo the data back to the client.

                Send(handler, content);

            }

            else

            {

                // Not all data received. Get more.

                handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(ReadCallback), state);

            }

        }

    }

    private static void Send(Socket handler, String data)

    {

        // Convert the string data to byte data using ASCII encoding.

        byte[] byteData = Encoding.ASCII.GetBytes(data);

        // Begin sending the data to the remote device.

        handler.BeginSend(byteData, 0, byteData.Length, 0, new AsyncCallback(SendCallback), handler);

    }

    private static void SendCallback(IAsyncResult ar)

    {

        try

        {

            // Retrieve the socket from the state object.

            Socket handler = (Socket)ar.AsyncState;

            // Complete sending the data to the remote device.

            int bytesSent = handler.EndSend(ar);

            Console.WriteLine("Sent {0} bytes to client.", bytesSent);

            handler.Shutdown(SocketShutdown.Both);

            handler.Close();

        }

        catch (Exception e)

        {

            Console.WriteLine(e.ToString());

        }

    }