new TcpClient(server, port)

AcceptTcpClient()

stream.Close()

client.Close()

using System;
using System.Net.Sockets;
using System.Text;
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namespace TCpClient
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // 定義服務(wù)器的IP地址和端口號
            string serverIp = "172.16.0.14"; // 替換為實際服務(wù)器IP（本機測試可填127.0.0.1）
            int serverPort = 9898;
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            TcpClient tcpClient = null;
            NetworkStream networkStream = null;
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            try
            {
                // 1. 建立TCP連接（底層三次握手）
                tcpClient = new TcpClient(serverIp, serverPort);
                Console.WriteLine($"成功連接到服務(wù)器 {serverIp}:{serverPort}");
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                // 2. 獲取網(wǎng)絡(luò)流（用于數(shù)據(jù)收發(fā)）
                networkStream = tcpClient.GetStream();
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                // 3. 發(fā)送數(shù)據(jù)到服務(wù)器
                Console.WriteLine("請輸入要發(fā)送的消息：");
                string sendMessage = Console.ReadLine();
                byte[] sendData = Encoding.UTF8.GetBytes(sendMessage);
                networkStream.Write(sendData, 0, sendData.Length);
                Console.WriteLine($"客戶端已發(fā)送：{sendMessage}");
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                // 4. 接收服務(wù)器響應(yīng)
                byte[] receiveBuffer = new byte[256]; // 定義緩沖區(qū)存儲接收的數(shù)據(jù)
                int receiveBytes = networkStream.Read(receiveBuffer, 0, receiveBuffer.Length);
                string receiveMessage = Encoding.UTF8.GetString(receiveBuffer, 0, receiveBytes);
                Console.WriteLine($"客戶端收到服務(wù)器響應(yīng)：{receiveMessage}");
            }
            catch (Exception ex)
            {
                Console.WriteLine($"連接/通信異常：{ex.Message}");
            }
            finally
            {
                // 5. 釋放資源（底層四次揮手）
                if (networkStream != null) networkStream.Close();
                if (tcpClient != null) tcpClient.Close();
            }
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            Console.WriteLine("客戶端程序結(jié)束，按任意鍵退出...");
            Console.ReadKey();
        }
    }
}

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
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namespace TCPServer
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // 定義監(jiān)聽端口
            int listenPort = 9898;
            TcpListener tcpListener = null;
            TcpClient client = null;
            NetworkStream networkStream = null;
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            try
            {
                // 1. 初始化監(jiān)聽器并啟動監(jiān)聽
                tcpListener = new TcpListener(IPAddress.Any, listenPort);
                tcpListener.Start();
                Console.WriteLine($"服務(wù)器已啟動，正在監(jiān)聽端口 {listenPort}...");
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                // 2. 循環(huán)等待客戶端連接（單線程，僅處理一個客戶端）
                while (true)
                {
                    // 阻塞等待客戶端連接
                    client = tcpListener.AcceptTcpClient();
                    Console.WriteLine("有客戶端成功連接！");
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                    // 3. 獲取網(wǎng)絡(luò)流，處理數(shù)據(jù)交互
                    networkStream = client.GetStream();
                    byte[] receiveBuffer = new byte[256];
                    int readBytes;
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                    // 循環(huán)讀取客戶端發(fā)送的數(shù)據(jù)（直到客戶端斷開）
                    while ((readBytes = networkStream.Read(receiveBuffer, 0, receiveBuffer.Length)) != 0)
                    {
                        // 解析接收的字節(jié)數(shù)據(jù)為字符串
                        string receiveMessage = Encoding.UTF8.GetString(receiveBuffer, 0, readBytes);
                        Console.WriteLine($"服務(wù)器收到客戶端數(shù)據(jù)：{receiveMessage}");
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                        // 4. 向客戶端發(fā)送響應(yīng)
                        string responseMessage = "已收到客戶端消息";
                        byte[] responseData = Encoding.UTF8.GetBytes(responseMessage);
                        networkStream.Write(responseData, 0, responseData.Length);
                        Console.WriteLine($"服務(wù)器已發(fā)送響應(yīng)：{responseMessage}");
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"服務(wù)器異常：{ex.ToString()}");
            }
            finally
            {
                // 5. 釋放資源
                if (networkStream != null) networkStream.Close();
                if (client != null) client.Close();
                if (tcpListener != null) tcpListener.Stop();
            }
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            Console.WriteLine("服務(wù)器程序結(jié)束，按任意鍵退出...");
            Console.ReadKey();
        }
    }
}