C++创建一个Server端类，用来接受Client的数据并将消息打印出来

要在C++中创建一个Server端类，可以使用套接字编程来实现。以下是一个简单的示例，展示了如何创建一个Server端类，用于接收客户端的数据并将消息打印出来：

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

class Server {
public:
    Server(int port) {
        sockfd = socket(AF_INET, SOCK_STREAM, 0);
        if (sockfd == -1) {
            std::cerr << "创建套接字失败" << std::endl;
            exit(1);
        }

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

        if (bind(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1) {
            std::cerr << "绑定套接字失败" << std::endl;
            exit(1);
        }

        if (listen(sockfd, 5) == -1) {
            std::cerr << "监听套接字失败" << std::endl;
            exit(1);
        }
    }

    void acceptClients() {
        while (true) {
            sockaddr_in client_addr;
            socklen_t client_addr_len = sizeof(client_addr);
            int new_sockfd = accept(sockfd, (struct sockaddr *)&client_addr, &client_addr_len);
            if (new_sockfd == -1) {
                std::cerr << "接受客户端连接失败" << std::endl;
                continue;
            }

            std::cout << "客户端已连接" << std::endl;
            handleClient(new_sockfd);
        }
    }

private:
    int sockfd;

    void handleClient(int client_sockfd) {
        char buffer[1024];
        while (true) {
            ssize_t bytes_received = recv(client_sockfd, buffer, sizeof(buffer), 0);
            if (bytes_received <= 0) {
                std::cout << "客户端断开连接" << std::endl;
                break;
            }

            buffer[bytes_received] = '\0';
            std::cout << "收到消息： " << buffer << std::endl;
        }

        close(client_sockfd);
    }
};

int main() {
    int port = 8080;
    Server server(port);
    server.acceptClients();

    return 0;
}

这个示例中，我们创建了一个名为`Server`的类，它包含一个构造函数，用于初始化套接字并绑定到指定的端口。`acceptClients`方法用于监听客户端连接，并在有新的连接时调用`handleClient`方法处理客户端发送的数据。`handleClient`方法接收客户端发送的消息并将其打印出来。