一、服务器端

using System.Net;
using System.Net.Sockets;
using System.Text;
TcpListener server = new TcpListener(IPAddress.Any, 9999);
server.Start();
Console.WriteLine("服务已开启");
while (true)
{TcpClient client = server.AcceptTcpClient();Thread thread = new Thread(HandleCilent);thread.Start(client);
}
static void HandleCilent(object obj)
{TcpClient client = (TcpClient)obj;NetworkStream stream = client.GetStream();byte[] data = new byte[1024];int byteRead;try{while ((byteRead = stream.Read(data, 0, data.Length)) != 0){string message = Encoding.UTF8.GetString(data, 0, byteRead);Console.WriteLine("接收到" + message);byte[] response = Encoding.UTF8.GetBytes("服务器接收到" + message);stream.Write(response, 0, response.Length);}}catch (IOException ex){Console.WriteLine("客户端已断开"+ex.ToString());}finally {client.Close();}}

二、客户端

public class Program
{static void Main(string[] args){TcpClient client = new TcpClient("8.130.127.7", 9999);NetworkStream stream = client.GetStream();while (true){Console.WriteLine("请输入要发送的消息（输入 'exit' 退出）：");string message = Console.ReadLine();if (message.ToLower() == "exit"){break;}byte[] data = Encoding.UTF8.GetBytes(message);stream.Write(data, 0, data.Length);// 接收服务器的响应byte[] responseData = new byte[1024];int bytesRead = stream.Read(responseData, 0, responseData.Length);string response = Encoding.UTF8.GetString(responseData, 0, bytesRead);Console.WriteLine("服务器消息：" + response);}client.Close();}
}