C++客户端服务器TCP创建

客户端

#include <iostream>
#include <cstring>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

int main() {
   
    // 创建客户端套接字
    int clientSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (clientSocket == -1) {
   
        std::cerr << "Error creating socket\n";
        return -1;
    }

    // 服务器地址结构
    sockaddr_in serverAddr;
    std::memset(&serverAddr, 0, sizeof(serverAddr));
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(8080);  // 服务器监听端口
    serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");  // 服务器IP地址

    // 连接到服务器
    if (connect(clientSocket, reinterpret_cast<struct sockaddr*>(&serverAddr), sizeof(serverAddr)) == -1) {
   
        std::cerr << "Error connecting to server\n";
        close(clientSocket);
        return -1;
    }

    std::cout << "Connected to server\n";

    // 循环发送数据
    while (true) {
   
        std::string message;
        std::cout << "Enter message to send (or 'exit' to quit): ";
        std::getline(std::cin, message);

        if (message == "exit") {
   
            break;
        }

        if (send(clientSocket, message.c_str(), message.size(), 0) == -1) {
   
            std::cerr << "Error sending data\n";
            break;
        }
    }

    // 关闭客户端套接字
    close(clientSocket);

    return 0;
}

服务器

#include <iostream>
#include <cstring>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

int main() {
   
    // 创建服务器套接字
    int serverSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (serverSocket == -1) {
   
        std::cerr << "Error creating socket\n";
        return -1;
    }

    // 服务器地址结构
    sockaddr_in serverAddr;
    std::memset(&serverAddr, 0, sizeof(serverAddr));
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(23);  // 服务器监听端口
    serverAddr.sin_addr.s_addr = inet_addr("192.168.0.7");

    // 绑定服务器地址
    if (bind(serverSocket, reinterpret_cast<struct sockaddr*>(&serverAddr), sizeof(serverAddr)) == -1) {
   
        std::cerr << "Error binding socket\n";
        close(serverSocket);
        return -1;
    }

    // 监听连接请求
    if (listen(serverSocket, 5) == -1) {
   
        std::cerr << "Error listening on socket\n";
        close(serverSocket);
        return -1;
    }

    std::cout << "Server listening on port 23...\n";

    while (true) {
   
        // 接受连接
        sockaddr_in clientAddr;
        socklen_t clientAddrLen = sizeof(clientAddr);
        int clientSocket = accept(serverSocket, reinterpret_cast<struct sockaddr*>(&clientAddr), &clientAddrLen);

        if (clientSocket == -1) {
   
            std::cerr << "Error accepting connection\n";
            continue;
        }

        std::cout << "Client connected\n";

        // 循环接收数据
        char buffer[1024 * 1024 * 1];
        int bytesRead;

        while ((bytesRead = recv(clientSocket, buffer, sizeof(buffer), 0)) > 0) {
   
            buffer[bytesRead] = '\0';
            std::cout << "Received data from client: " << buffer << std::endl;
        }

        if (bytesRead == 0) {
   
            std::cout << "Client disconnected\n";
        } else {
   
            std::cerr << "Error receiving data\n";
        }

        // 关闭客户端套接字
        close(clientSocket);
    }

    // 关闭服务器套接字
    close(serverSocket);

    return 0;
}