windows系统下 使用C++创建一个Server端的类，用来接收Client的数据并将消息打印出来

在Windows系统下，使用C++创建一个Server端的类来接收Client的数据并将消息打印出来，可以使用Winsock库。以下是一个简单的示例：

#include <iostream>
#include <winsock2.h>
#pragma comment(lib, "ws2_32.lib")

class Server {
public:
    Server() {
        WSADATA wsaData;
        if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
            std::cerr << "WSAStartup failed: " << WSAGetLastError() << std::endl;
            exit(1);
        }
    }

    ~Server() {
        WSACleanup();
    }

    void start(int port) {
        SOCKET listenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
        if (listenSocket == INVALID_SOCKET) {
            std::cerr << "socket failed: " << WSAGetLastError() << std::endl;
            exit(1);
        }

        sockaddr_in serverAddr;
        serverAddr.sin_family = AF_INET;
        serverAddr.sin_addr.s_addr = INADDR_ANY;
        serverAddr.sin_port = htons(port);

        if (bind(listenSocket, (sockaddr*)&serverAddr, sizeof(serverAddr)) == SOCKET_ERROR) {
            std::cerr << "bind failed: " << WSAGetLastError() << std::endl;
            exit(1);
        }

        if (listen(listenSocket, SOMAXCONN) == SOCKET_ERROR) {
            std::cerr << "listen failed: " << WSAGetLastError() << std::endl;
            exit(1);
        }

        std::cout << "Server is listening on port " << port << std::endl;

        while (true) {
            sockaddr_in clientAddr;
            int clientAddrSize = sizeof(clientAddr);
            SOCKET clientSocket = accept(listenSocket, (sockaddr*)&clientAddr, &clientAddrSize);
            if (clientSocket == INVALID_SOCKET) {
                std::cerr << "accept failed: " << WSAGetLastError() << std::endl;
                continue;
            }

            char buffer[1024];
            int bytesReceived = recv(clientSocket, buffer, sizeof(buffer), 0);
            if (bytesReceived > 0) {
                buffer[bytesReceived] = '\0';
                std::cout << "Received message: " << buffer << std::endl;
            }

            closesocket(clientSocket);
        }

        closesocket(listenSocket);
    }
};

int main() {
    Server server;
    server.start(8080);
    return 0;
}

这个示例中，我们创建了一个名为`Server`的类，它在构造函数中初始化Winsock库，并在析构函数中清理资源。`start`方法用于启动服务器并监听指定端口。当客户端连接时，服务器接收数据并将其打印到控制台。注意，这个示例没有处理多个客户端连接的情况，也没有实现错误处理和异常处理。在实际项目中，你可能需要根据需求进行相应的修改和扩展。