.net网络编程(3)Socket基础

参考:

与Socket的第一次“约会”

与Socket的“再次见面”

揭开Socket编程的面纱

“麻烦”的数据缓冲区

《.NET 4.0网络开发入门之旅》7——填平缓冲区陷阱

一.服务器端

class Threadtcpserver
{
    private Socket server;
    public Threadtcpserver()
    {
        IPAddress local = IPAddress.Parse("127.0.0.1");
        IPEndPoint iep = new IPEndPoint(local, 13000);
        server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

        // 将套接字与本地终结点绑定    
        server.Bind(iep);

        //在本地13000端口号上进行监听    
        server.Listen(20);
        Console.WriteLine("等待客户机进行连接......");
        while (true)
        {
            // 得到包含客户端信息的套接字
            Socket client = server.Accept();

            //创建消息服务线程对象
            ClientThread newclient = new ClientThread(client);
            newclient.ClientService();
        }
    }
    static void Main(string[] args)
    {
        Threadtcpserver instance = new Threadtcpserver();
    }
}
class ClientThread
{
    //connections变量表示连接数
    public static int connections = 0;
    public Socket service;
    int i;
    public ClientThread(Socket clientsocket)
    {
        //service对象接管对消息的控制
        this.service = clientsocket;
    }
    public void ClientService()
    {
        String data = null;
        byte[] bytes = new byte[1024];
        if (service != null)
        {
            connections++;
        }
        Console.WriteLine("新客户连接建立:{0} 个连接数", connections);
        while ((i = service.Receive(bytes)) != 0)
        {
            data = System.Text.Encoding.UTF8.GetString(bytes, 0, i);
            Console.WriteLine("收到的数据: {0}", data);

            // 处理客户端发来的消息，这里是转化为大写字母
            data = data.ToUpper();
            byte[] msg = System.Text.Encoding.UTF8.GetBytes(data);

            // 发送一条应答消息
            service.Send(msg);
            Console.WriteLine("发送的数据: {0}", data);
        }
        //关闭套接字
        service.Close();
        connections--;
        Console.WriteLine("客户关闭连接:{0} 个连接数", connections);
    }
}

二.客户端

static void Main(string[] args)
{
    Socket client;
    byte[] buf = new byte[1024];
    string input;
    IPAddress local = IPAddress.Parse("127.0.0.1");
    IPEndPoint iep = new IPEndPoint(local, 13000);
    try
    {
        client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        client.Connect(iep);
    }
    catch (SocketException)
    {
        Console.WriteLine("无法连接到服务器!");
        return;
    }
    while (true)
    {
        //在控制台上输入一条消息
        input = Console.ReadLine();
        //输入exit，可以断开与服务器的连接
        if (input == "exit")
        {
            break;
        }
        client.Send(Encoding.ASCII.GetBytes(input));
        //得到实际收到的字节总数
        int rec = client.Receive(buf);
        Console.WriteLine(Encoding.ASCII.GetString(buf, 0, rec));
    }
    Console.WriteLine("断开与服务器的连接......");
    client.Close();
}

测试结果：

换成UTF-8编码,就可以接受和发送中文了