【软件设计师备考 专题 】因特网基础知识以及应用（二）

#include <iostream>
#include <fstream>
#include <winsock2.h>
#pragma comment(lib, "ws2_32.lib")
int main() {
    // 初始化Winsock库
    WSADATA wsaData;
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        std::cerr << "Failed to initialize Winsock" << std::endl;
        return 1;
    }
    // 创建套接字
    SOCKET clientSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (clientSocket == INVALID_SOCKET) {
        std::cerr << "Failed to create socket" << std::endl;
        WSACleanup();
        return 1;
    }
    // 连接到FTP服务器
    sockaddr_in serverAddress;
    serverAddress.sin_family = AF_INET;
    serverAddress.sin_port = htons(21);
    serverAddress.sin_addr.s_addr = inet_addr("ftp.example.com");
    if (connect(clientSocket, (struct sockaddr*)&serverAddress, sizeof(serverAddress)) == SOCKET_ERROR) {
        std::cerr << "Failed to connect to FTP server" << std::endl;
        closesocket(clientSocket);
        WSACleanup();
        return 1;
    }
    // 登录FTP服务器
    std::string username = "ftpuser";
    std::string password = "ftppassword";
    std::string loginRequest = "USER " + username + "\r\n";
    loginRequest += "PASS " + password + "\r\n";
    if (send(clientSocket, loginRequest.c_str(), loginRequest.length(), 0) == SOCKET_ERROR) {
        std::cerr << "Failed to send login request" << std::endl;
        closesocket(clientSocket);
        WSACleanup();
        return 1;
    }
    // 上传文件
    std::string filename = "example.txt";
    std::ifstream file(filename, std::ios::binary);
    if (!file) {
        std::cerr << "Failed to open file" << std::endl;
        closesocket(clientSocket);
        WSACleanup();
        return 1;
    }
    std::string uploadRequest = "STOR " + filename + "\r\n";
    if (send(clientSocket, uploadRequest.c_str(), uploadRequest.length(), 0) == SOCKET_ERROR) {
        std::cerr << "Failed to send upload request" << std::endl;
        file.close();
        closesocket(clientSocket);
        WSACleanup();
        return 1;
    }
    char buffer[4096];
    while (file.read(buffer, sizeof(buffer))) {
        if (send(clientSocket, buffer, file.gcount(), 0) == SOCKET_ERROR) {
            std::cerr << "Failed to upload file" << std::endl;
            file.close();
            closesocket(clientSocket);
            WSACleanup();
            return 1;
        }
    }
    // 关闭套接字并清理Winsock库
    file.close();
    closesocket(clientSocket);
    WSACleanup();
    std::cout << "File uploaded successfully" << std::endl;
    return 0;
}

#include <iostream>
#include <string>
#include <winsock2.h>
#pragma comment(lib, "ws2_32.lib")
int main() {
    // 初始化Winsock库
    WSADATA wsaData;
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        std::cerr << "Failed to initialize Winsock" << std::endl;
        return 1;
    }
    // 创建套接字
    SOCKET clientSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (clientSocket == INVALID_SOCKET) {
        std::cerr << "Failed to create socket" << std::endl;
        WSACleanup();
        return 1;
    }
    // 连接到Telnet服务器
    sockaddr_in serverAddress;
    serverAddress.sin_family = AF_INET;
    serverAddress.sin_port = htons(23);
    serverAddress.sin_addr.s_addr = inet_addr("telnet.example.com");
    if (connect(clientSocket, (struct sockaddr*)&serverAddress, sizeof(serverAddress)) == SOCKET_ERROR) {
        std::cerr << "Failed to connect to Telnet server" << std::endl;
        closesocket(clientSocket);
        WSACleanup();
        return 1;
    }
    // 发送登录信息
    std::string username = "telnetuser";
    std::string password = "telnetpassword";
    std::string loginRequest = username + "\r\n" + password + "\r\n";
    if (send(clientSocket, loginRequest.c_str(), loginRequest.length(), 0) == SOCKET_ERROR) {
        std::cerr << "Failed to send login request" << std::endl;
        closesocket(clientSocket);
        WSACleanup();
        return 1;
    }
    // 接收并显示服务器响应
    char buffer[4096];
    std::string serverResponse;
    while (true) {
        int bytesRead = recv(clientSocket, buffer, sizeof(buffer) - 1, 0);
        if (bytesRead <= 0) {
            break;
        }
        buffer[bytesRead] = '\0';
        serverResponse += buffer;
    }
    std::cout << "Server response:" << std::endl;
    std::cout << serverResponse << std::endl;
    // 关闭套接字并清理Winsock库
    closesocket(clientSocket);
    WSACleanup();
    return 0;
}