### Python TCP 实验代码示例 以下是基于所提供的参考资料以及标准的 Python TCP 编程实践所整理的一个完整的实验代码示例。该代码分为服务器端和客户端两部分。 #### 服务端代码 ```python import socket from threading import Thread def handle_client(client_socket): try: while True: request = client_socket.recv(1024).decode('utf-8') if not request: break print(f"Received: {request}") response = f"ECHO: {request}" client_socket.send(response.encode('utf-8')) except Exception as e: print(f"Error handling client: {e}") finally: client_socket.close() def start_server(): server = socket.socket(socket.AF_INET, socket.SOCK_STREAM) server.bind(('localhost', 9999)) server.listen(5) print("Server is listening on port 9999...") try: while True: client_sock, addr = server.accept() print(f"Accepted connection from {addr}") client_handler = Thread(target=handle_client, args=(client_sock,)) client_handler.start() except KeyboardInterrupt: print("\nShutting down the server...") finally: server.close() if __name__ == "__main__": start_server() ``` 此服务端代码实现了多线程处理多个客户端请求的功能[^1]，并加入了异常捕获机制以提高稳定性[^2]。 #### 客户端代码 ```python import socket def start_client(): client = socket.socket(socket.AF_INET, socket.SOCK_STREAM) client.connect(('localhost', 9999)) try: while True: message = input("> ") if not message: break client.send(message.encode('utf-8')) response = client.recv(1024).decode('utf-8') print(f"Response: {response}") except KeyboardInterrupt: print("\nClosing client...") finally: client.close() if __name__ == "__main__": start_client() ``` 这段客户端代码允许用户通过命令行输入消息发送给服务器，并接收来自服务器的响应。 以上代码展示了如何构建一个基本的TCP通信模型，其中包含了错误处理、资源释放等功能设计[^2]。