[我眼中的C#]网络编程

以你之姓@ 2022-09-30 00:49 248阅读 0赞

**TCP协议通过Socket（套接字）建服务器和客户端**  
服务器端：

static void Main(string[] args)
            {
                //创建Socket,这里用的是TCP协议，所以SocketType为Stream（流）
                Socket tcpServer = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                //绑定IP跟端口号
                IPAddress ip = new IPAddress(new byte[] { 127, 0, 0, 1 });
                IPEndPoint point = new IPEndPoint(ip, 7899);
                tcpServer.Bind(point);//向操作系统申请一个可用的IP根端口号用来做通信     
                //开始监听
                tcpServer.Listen(100);
                //接收消息
                Socket clientSocket = tcpServer.Accept();//暂停线程知道有一个客户端链接过来
                //使用返回的socket跟客户端做通信
                string message = "Hello 欢迎你！";
                byte[] data = Encoding.UTF8.GetBytes(message);
                clientSocket.Send(data);
                //死循环用来一直接受客户端的消息
                while (true)
                {
                    byte[] backData = new byte[1024];
                    int length = clientSocket.Receive(backData);
                    string backMessage = Encoding.UTF8.GetString(backData, 0, length);
                    Console.WriteLine(backMessage);
                }
                Console.ReadKey();
            }

客户端：

static void Main(string[] args)
            {
                //创建socket
                Socket tcpClient=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
                //发起建立连接的请求
                IPAddress ip = IPAddress.Parse("127.0.0.1");
                IPEndPoint point = new IPEndPoint(ip,7899);
                tcpClient.Connect(point);
                //接受消息
                byte[] data = new byte[1024];
                string message;
                int length= tcpClient.Receive(data);
                message = Encoding.UTF8.GetString(data, 0, length);
                Console.WriteLine(message);
                while (true)
                {
                    string backMessage = Console.ReadLine();
                    byte[] backData = Encoding.UTF8.GetBytes(backMessage);
                    tcpClient.Send(backData);
                }
                Console.ReadKey();
            }

**UDP协议通过Socket（套接字）建服务器和客户端**  
服务器端：

static void Main(string[] args)
            {
                //创建socket
                Socket udpServer = new Socket(AddressFamily.InterNetwork,SocketType.Dgram,ProtocolType.Udp);
                //绑定IP跟端口号
                udpServer.Bind(new IPEndPoint(IPAddress.Parse("127.0.0.1"),7899 ));
                //接收数据
                byte[] data = new byte[1024];
                EndPoint remoteEndPoint = new IPEndPoint(IPAddress.Any,0);
                int length=udpServer.ReceiveFrom(data,ref remoteEndPoint);//这个方法会把收据的来源（IP，端口号）放到第二个参数上
                string message = Encoding.UTF8.GetString(data,0,length);
                Console.WriteLine("from ip"+(remoteEndPoint as IPEndPoint).Address.ToString()+"port"+(remoteEndPoint as IPEndPoint).Port.ToString()+"receive messages:"+message);
                udpServer.Close();
                Console.ReadKey();
            }
        }

客户端：

static void Main(string[] args)
            {
                Socket udpClient = new Socket(AddressFamily.InterNetwork,SocketType.Dgram,ProtocolType.Udp);
                string message = Console.ReadLine();
                byte[] data = Encoding.UTF8.GetBytes(message);
                udpClient.SendTo(data,new IPEndPoint(IPAddress.Parse("127.0.0.1"),7899));
                Console.ReadKey();
            }

**TCPListener和TCPClient**  
服务器端：

static void Main(string[] args)
            {
                //TCPListener对Socket进行了一层封装，会自动创建Socket对象
                TcpListener tcpServer=new TcpListener(new IPEndPoint(IPAddress.Parse("127.0.0.1"),7899));
                //开始监听
                tcpServer.Start();
                //等待客户端连接
                TcpClient client= tcpServer.AcceptTcpClient();
                //开始通信
                byte[] data = new byte[1024];
                NetworkStream stream= client.GetStream();//从这个网络流可以读取客户端发送过来的数据
                int length=stream.Read(data,0,1024);//读取数据
                string message = Encoding.UTF8.GetString(data,0,length);
                Console.WriteLine(message);
                stream.Close();
                client.Close();
                tcpServer.Stop();
                Console.ReadKey();
            }

客户端：  
static void Main(string\[\] args)  
\{  
//建立对象的时候就会建立连接  
TcpClient client = new TcpClient(“127.0.0.1”,7899);

NetworkStream stream= client.GetStream();
            byte[] data = Encoding.UTF8.GetBytes(Console.ReadLine());
            stream.Write(data,0,data.Length);
            stream.Close();
            client.Close(); 
            Console.ReadKey();
        }

**UDPClient**  
服务器端：

static void Main(string[] args)
            {
                UdpClient udpClient = new UdpClient(new IPEndPoint(IPAddress.Parse("127.0.0.1"),7899 ));
                IPEndPoint point=new IPEndPoint(IPAddress.Any, 0);
                byte []data=udpClient.Receive(ref point);
                string message = Encoding.UTF8.GetString(data, 0, data.Length);
                Console.WriteLine(message);
                udpClient.Close();
                Console.ReadKey();
            }

客户端：

static void Main(string[] args)
            {
                UdpClient udpClient = new UdpClient();
                string message = Console.ReadLine();
                byte[] data = Encoding.UTF8.GetBytes(message);
                udpClient.Send(data,data.Length,new IPEndPoint(IPAddress.Parse("127.0.0.1"),7899 ));
                udpClient.Close();
                Console.ReadKey();
            }