快速理解socket

貌似n久前写过一篇, 人的忘性太大了, 再来个入门的

通俗的理解socket就是ip和端口的组合.  所以你看到定义一个socket的方式就是:

int port = 2000;
string host = "127.0.0.1";
IPAddress ip = IPAddress.Parse(host);
IPEndPoint ipe = new IPEndPoint(ip, port);
Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//创建一个Socket类
s.Bind(ipe);//绑定2000端口

知道了socket的意思之后, 直接看例子, 新建两个控制台项目

//server
static void Main(string[] args)
        {
            try
            {
                int port = 2000;
                string host = "127.0.0.1";
                IPAddress ip = IPAddress.Parse(host);
                IPEndPoint ipe = new IPEndPoint(ip, port);
                Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//创建一个Socket类
                s.Bind(ipe);//绑定2000端口
                s.Listen(0);//开始监听
                Console.WriteLine("Wait for connect");
                Socket temp = s.Accept();//为新建连接创建新的Socket。
                Console.WriteLine("Get a connect");
                string recvStr = "";
                byte[] recvBytes = new byte[1024];
                int bytes;
                bytes = temp.Receive(recvBytes, recvBytes.Length, 0);//从客户端接受信息
                recvStr += Encoding.ASCII.GetString(recvBytes, 0, bytes);
                Console.WriteLine("Server Get Message:{0}", recvStr);//把客户端传来的信息显示出来
                string sendStr = "Ok!Client Send Message Sucessful!";
                byte[] bs = Encoding.ASCII.GetBytes(sendStr);
                temp.Send(bs, bs.Length, 0);//返回客户端成功信息
                temp.Close();
                s.Close();
            }
            catch (ArgumentNullException e)
            {
                Console.WriteLine("ArgumentNullException: {0}", e);
            }
            catch (SocketException e)
            {
                Console.WriteLine("SocketException: {0}", e);
            }
            Console.WriteLine("Press Enter to Exit");
            Console.ReadLine();
        }

//客户端
static void Main(string[] args)
        {
            try
            {
                int port = 2000;
                string host = "127.0.0.1";
                IPAddress ip = IPAddress.Parse(host);
                IPEndPoint ipe = new IPEndPoint(ip, port);//把ip和端口转化为IPEndPoint实例
                Socket c = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//创建一个Socket
                Console.WriteLine("Conneting...");
                c.Connect(ipe);//连接到服务器
                string sendStr = "hello!This is a socket test";
                byte[] bs = Encoding.ASCII.GetBytes(sendStr);
                Console.WriteLine("Send Message");
                c.Send(bs, bs.Length, 0);//发送测试信息
                string recvStr = "";
                byte[] recvBytes = new byte[1024];
                int bytes;
                bytes = c.Receive(recvBytes, recvBytes.Length, 0);//从服务器端接受返回信息
                recvStr += Encoding.ASCII.GetString(recvBytes, 0, bytes);
                Console.WriteLine("Client Get Message:{0}", recvStr);//显示服务器返回信息
                c.Close();
            }
            catch (ArgumentNullException e)
            {
                Console.WriteLine("ArgumentNullException: {0}", e);
            }
            catch (SocketException e)
            {
                Console.WriteLine("SocketException: {0}", e);
            }
            Console.WriteLine("Press Enter to Exit");
            Console.ReadLine();
        }