以C语言写一、编写服务器和客户端： 服务器：1.socket() 创建流式套接字. 2.bind() 绑定自己的地址信息. 3.listen()设置成被动监听状态. 4.accept() 等待并接受连接请求. 5.recv()/recvfrom() 接受数据信息. read() 6.send()/sendto() 发送数据信息. write() 7.close() 关闭套接字. 客户端：1.socket() 创建流式套接字. (2.bind() 绑定自己的地址信息.) 3.connet() 向服务器端的套接字发送连接请求. 4.send()/sendto() 发送数据信息. write() 5.recv()/recvfrom() 接受数据信息. read() 6.close() 关闭套接字.

以下是一个简单的服务器和客户端的示例代码，使用了C语言的套接字编程：

服务器端代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>

#define PORT 8080
#define MAX_BUFFER_SIZE 1024

int main(int argc, char const *argv[]) {
    int server_fd, new_socket, valread;
    struct sockaddr_in address;
    int opt = 1;
    int addrlen = sizeof(address);
    char buffer[MAX_BUFFER_SIZE] = {0};
    char *hello = "Hello from server";

    // Create socket file descriptor
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }

    // Forcefully attach socket to the port 8080
    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(PORT);

    // Bind the socket to the specified address and port
    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }

    // Start listening for incoming connections
    if (listen(server_fd, 3) < 0) {
        perror("listen");
        exit(EXIT_FAILURE);
    }

    // Wait for incoming connections and handle them
    if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < 0) {
        perror("accept");
        exit(EXIT_FAILURE);
    }

    valread = read(new_socket, buffer, MAX_BUFFER_SIZE);
    printf("%s\n", buffer);
    send(new_socket, hello, strlen(hello), 0);
    printf("Hello message sent\n");

    return 0;
}

客户端代码：

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

#define PORT 8080
#define MAX_BUFFER_SIZE 1024

int main(int argc, char const *argv[]) {
    int sock = 0, valread;
    struct sockaddr_in serv_addr;
    char *hello = "Hello from client";
    char buffer[MAX_BUFFER_SIZE] = {0};

    // Create socket file descriptor
    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        printf("\n Socket creation error \n");
        return -1;
    }

    memset(&serv_addr, '0', sizeof(serv_addr));

    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(PORT);

    // Convert IPv4 and IPv6 addresses from text to binary form
    if(inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr)<=0) {
        printf("\nInvalid address/ Address not supported \n");
        return -1;
    }

    // Connect the socket to the specified address and port
    if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
        printf("\nConnection Failed \n");
        return -1;
    }

    send(sock, hello, strlen(hello), 0);
    printf("Hello message sent\n");
    valread = read(sock, buffer, MAX_BUFFER_SIZE);
    printf("%s\n", buffer);

    return 0;
}

这个示例代码实现了一个简单的回声服务器和客户端，当客户端连接到服务器后，发送一个“Hello from client”字符串，服务器接收到该字符串后，会将其回传给客户端，并在客户端上显示出来。如果需要实现其他功能，可以根据需要修改代码。