服务器端： 1创建套接字 2绑定 3监听 4accept 5发送 接受
客户端： 1创建套接字 2 建立连接 connect 3 发送消息
#include <arpa/inet.h> // 包含了 sys/socket.h 和netinet/in.h
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>int main(void)
{// 1. 创建监听套接字int listen_fd = socket(AF_INET, SOCK_STREAM, 0);if (listen_fd == -1){perror("socket");exit(EXIT_FAILURE);}// 2. 绑定本地的 IP 和端口struct sockaddr_in server_addr;memset(&server_addr, 0, sizeof(server_addr));server_addr.sin_family = AF_INET;server_addr.sin_port = htons(8088);server_addr.sin_addr.s_addr = INADDR_ANY;if (bind(listen_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1){perror("bind");exit(EXIT_FAILURE);}// 3. 开始监听if (listen(listen_fd, 10) == -1){perror("listen");exit(EXIT_FAILURE);}// 4. 阻塞并等待客户端的连接struct sockaddr_in client_addr;socklen_t client_addr_len = sizeof(client_addr);int conn_fd = accept(listen_fd, (struct sockaddr *)&client_addr, &client_addr_len);if (conn_fd == -1){perror("accept");exit(EXIT_FAILURE);}// 打印客户端的 IP 和端口信息char client_ip[INET_ADDRSTRLEN];printf("客户端的 IP: %s 端口: %d\n",inet_ntop(AF_INET, &client_addr.sin_addr, client_ip, INET_ADDRSTRLEN),ntohs(client_addr.sin_port));// 5. 通信循环while (1){char message[1024];ssize_t len = recv(conn_fd, message, sizeof(message) - 1, 0);if (len > 0){message[len] = '\0'; // 确保字符串以 null 字符结尾printf("客户端说: %s\n", message);send(conn_fd, message, len, 0);}else if (len == 0){printf("客户端已经断开连接\n");break;}else{perror("recv");break;}}// 6. 关闭套接字close(conn_fd);close(listen_fd);return 0;
}客户端：
#include <arpa/inet.h> // 包含了 sys/socket.h 和netinet/in.h
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>int main(int argc, char const *argv[])
{int fd = socket(AF_INET, SOCK_STREAM, 0);if (fd == -1){perror("socket");exit(EXIT_FAILURE);}struct sockaddr_in addr;memset(&addr, 0, sizeof(addr));addr.sin_family = AF_INET;addr.sin_port = htons(8088); // 使用 htons 而不是 htonlif (inet_pton(AF_INET, "192.168.63.129", &addr.sin_addr) <= 0){perror("inet_pton");exit(EXIT_FAILURE);}if (connect(fd, (struct sockaddr *)&addr, sizeof(addr)) == -1){perror("connect");exit(EXIT_FAILURE);}int num = 0;while (1){char buf[1024];memset(buf, 0, sizeof(buf));sprintf(buf, "hello world: %d\n", num++);if (send(fd, buf, strlen(buf), 0) == -1){perror("send");break;}printf("send: %s", buf);memset(buf, 0, sizeof(buf)); // 清理接收缓冲区ssize_t len = recv(fd, buf, sizeof(buf) - 1, 0);if (len > 0){buf[len] = '\0'; // 确保字符串以 null 字符结尾printf("recv: %s", buf);}else if (len == 0){printf("server closed connection\n");break;}else{perror("recv");break;}sleep(1);}close(fd);return 0;
}
