生成一个简单的c++服务器例子

好的，以下是一个简单的 C++ 服务器例子：

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

int main(int argc, char *argv[]) {
    int server_socket, client_socket;
    struct sockaddr_in server_address, client_address;
    char buffer[1024] = {0};
    const char *message = "Hello from server!";

    // 创建 socket
    if ((server_socket = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        std::cerr << "Failed to create socket" << std::endl;
        return -1;
    }

    // 设置服务器地址
    server_address.sin_family = AF_INET;
    server_address.sin_addr.s_addr = INADDR_ANY;
    server_address.sin_port = htons(8888);

    // 绑定 socket
    if (bind(server_socket, (struct sockaddr *)&server_address, sizeof(server_address)) < 0) {
        std::cerr << "Failed to bind socket" << std::endl;
        return -1;
    }

    // 监听 socket
    if (listen(server_socket, 3) < 0) {
        std::cerr << "Failed to listen on socket" << std::endl;
        return -1;
    }

    std::cout << "Server listening on port 8888" << std::endl;

    // 接受客户端连接
    socklen_t client_address_size = sizeof(client_address);
    if ((client_socket = accept(server_socket, (struct sockaddr *)&client_address, &client_address_size)) < 0) {
        std::cerr << "Failed to accept client connection" << std::endl;
        return -1;
    }

    std::cout << "Client connected" << std::endl;

    // 从客户端接收数据
    int bytes_received = read(client_socket, buffer, 1024);
    std::cout << "Received " << bytes_received << " bytes from client: " << buffer << std::endl;

    // 发送数据给客户端
    send(client_socket, message, strlen(message), 0);
    std::cout << "Sent message to client: " << message << std::endl;

    // 关闭 socket
    close(client_socket);
    close(server_socket);

    return 0;
}

这个例子实现了一个简单的服务器，它监听本地主机的 8888 端口，接受客户端连接，从客户端接收数据并且发送一条消息给客户端。