用 C++ 实现简单 TCP 服务端：代码示例与详解

```cpp #include <iostream> #include <string> #include <sys/socket.h> #include <arpa/inet.h> #include <unistd.h> #include <cstring> int main() { int server_fd, new_socket; struct sockaddr_in address; int opt = 1; int addrlen = sizeof(address); char buffer[1024] = {0}; const char *hello = "Hello from server"; // 创建套接字 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); } // 绑定套接字到端口 address.sin_family = AF_INET; address.sin_addr.s_addr = INADDR_ANY; address.sin_port = htons(8080); 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); } // 接受客户端连接 if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < 0) { perror("accept"); exit(EXIT_FAILURE); } // 读取客户端发送的数据 read(new_socket, buffer, 1024); std::cout << "Client: " << buffer << std::endl; // 向客户端发送数据 send(new_socket, hello, strlen(hello), 0); std::cout << "Server: " << hello << std::endl; // 关闭套接字 close(new_socket); close(server_fd); return 0; } ``` ######[AI写代码神器 | 614点数解答 | 2024-02-23 09:56:59]