计算机网络课设要求做一个基于TCP协议的简易聊天机器人代码要求可多个客户端

好的，下面我将给出一个基于TCP协议的简易聊天机器人C语言示例代码，可以同时与多个客户端进行交互，希望能帮到您：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <pthread.h>

#define PORT 8888
#define MAX_MSG_SIZE 1024
#define MAX_CLIENTS 10

void *handle_client(void *arg);

int main()
{
    int server_fd, new_socket, valread;
    struct sockaddr_in address;
    int opt = 1;
    int addrlen = sizeof(address);
    char buffer[MAX_MSG_SIZE] = {0};
    char *hello = "Hello from server";
    pthread_t thread_id;
    int i, client_sockets[MAX_CLIENTS], max_clients = MAX_CLIENTS, activity, sd, max_sd;
    fd_set readfds;

    // 创建TCP套接字
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0)
    {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }

    // 设置套接字选项
    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt)))
    {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }

    // 初始化服务器地址
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(PORT);

    // 绑定地址和端口
    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0)
    {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }

    // 监听连接
    if (listen(server_fd, 3) < 0)
    {
        perror("listen");
        exit(EXIT_FAILURE);
    }

    // 初始化客户端套接字列表
    for (i = 0; i < max_clients; i++)
    {
        client_sockets[i] = 0;
    }

    // 循环等待客户端连接和消息
    while (1)
    {
        // 清空文件描述符集合
        FD_ZERO(&readfds);

        // 将服务器套接字加入文件描述符集合
        FD_SET(server_fd, &readfds);
        max_sd = server_fd;

        // 将客户端套接字加入文件描述符集合
        for (i = 0; i < max_clients; i++)
        {
            sd = client_sockets[i];

            if (sd > 0)
                FD_SET(sd, &readfds);

            if (sd > max_sd)
                max_sd = sd;
        }

        // 等待读取文件描述符集合中的套接字
        activity = select(max_sd + 1, &readfds, NULL, NULL, NULL);

        if ((activity < 0) && (errno != EINTR))
        {
            printf("select error");
        }

        // 如果服务器套接字有新的连接请求
        if (FD_ISSET(server_fd, &readfds))
        {
            if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen))<0)
            {
                perror("accept");
                exit(EXIT_FAILURE);
            }

            // 发送欢迎消息
            send(new_socket, hello, strlen(hello), 0);
            printf("Hello message sent\n");

            // 将新连接的客户端套接字加入列表中
            for (i = 0; i < max_clients; i++)
            {
                if (client_sockets[i] == 0)
                {
                    client_sockets[i] = new_socket;
                    printf("Adding to list of sockets as %d\n" , i);
                    break;
                }
            }
        }

        // 处理客户端消息
        for (i = 0; i < max_clients; i++)
        {
            sd = client_sockets[i];

            if (FD_ISSET(sd, &readfds))
            {
                // 读取消息
                if ((valread = read(sd, buffer, MAX_MSG_SIZE)) == 0)
                {
                    getpeername(sd, (struct sockaddr*)&address, (socklen_t*)&addrlen);
                    printf("Host disconnected , ip %s , port %d \n" , inet_ntoa(address.sin_addr) , ntohs(address.sin_port));

                    // 关闭套接字并从列表中移除
                    close(sd);
                    client_sockets[i] = 0;
                }
                else
                {
                    // 启动新线程处理客户端消息
                    pthread_create(&thread_id, NULL, handle_client, (void *)&sd);
                    pthread_detach(thread_id);
                }
            }
        }
    }

    // 关闭套接字
    close(server_fd);
    return 0;
}

void *handle_client(void *arg)
{
    int sd = *(int*)arg;
    char buffer[MAX_MSG_SIZE] = {0};

    // 读取客户端消息
    read(sd, buffer, MAX_MSG_SIZE);

    // 根据客户端发送的消息，给出回复
    if (strcmp(buffer, "Hello\n") == 0)
    {
        printf("Server: Hi there!\n");
        send(sd, "Hi there!", strlen("Hi there!"), 0);
    }
    else if (strcmp(buffer, "How are you?\n") == 0)
    {
        printf("Server: I'm fine, thank you!\n");
        send(sd, "I'm fine, thank you!", strlen("I'm fine, thank you!"), 0);
    }
    else if (strcmp(buffer, "Quit\n") == 0)
    {
        printf("Server: Goodbye!\n");
        send(sd, "Goodbye!", strlen("Goodbye!"), 0);
    }
    else
    {
        printf("Server: Sorry, I don't understand.\n");
        send(sd, "Sorry, I don't understand.", strlen("Sorry, I don't understand."), 0);
    }

    // 关闭套接字
    close(sd);
    return NULL;
}

这个示例代码创建了一个TCP服务器程序，等待客户端连接和消息，并根据预先设定好的回复规则，与客户端进行交互。当收到客户端发送的消息后，服务器会根据预先设定好的回复规则，给客户端发送回复。当客户端发送“Quit”消息时，服务器会关闭连接。在实际应用中，可以根据需要修改回复规则和相关参数。同时，这个示例代码使用了多线程技术，可以同时处理多个客户端的消息。