Question

从TCPServer模块创建socketserver时，可以建立连接并持续使用，直到一方执行shutdown命令。编写了以下程序后，如果（出于各种原因）需要使用UDPServer，我不清楚如何继续与服务器通信。客户端是否应该根据需要继续运行sendto和recv方法并假装服务器将收到消息并返回回复？

客户端

import socket
import sys


def main():
    host, port = 'localhost', 10000
    data = ' '.join(sys.argv[1:])
    client = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    client.sendto(data.encode(), (host, port))
    received = client.recv(1 << 12).decode()
    print('Sent:    ', data)
    print('Received:', received)


if __name__ == '__main__':
    main()

服务器

import socketserver


def main():
    host, port = 'localhost', 10000
    server = socketserver.UDPServer((host, port), UDPHandler)
    server.serve_forever()


class UDPHandler(socketserver.DatagramRequestHandler):

    def handle(self):
        data = self.rfile.read().strip()
        client, port = self.client_address
        print(client, 'wrote:', data)
        self.wfile.write(data.upper())


if __name__ == '__main__':
    main()

Answer 1

由于使用数据报时不存在保证连接，因此客户端可以继续向服务器发送消息并尝试接收回复。在连接，关闭或关闭套接字方面没有什么特别之处。服务器应该像以前一样使用适当编写的处理程序来接收和发送客户端通信。以下示例演示了如何编写此类程序并包含用于指定其参数的命令行界面。

<强> UDPClient.py

#! /usr/bin/env python3
import argparse
import socket


def main():
    parser = argparse.ArgumentParser(description='Execute a UDP client demo.')
    parser.add_argument('host', type=str, help='computer where data is sent')
    parser.add_argument('port', type=int, help='location where server listens')
    arguments = parser.parse_args()
    address = arguments.host, arguments.port
    client = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    for _ in range(5):
        message = input('>>> ').encode('ascii')
        client.sendto(message, address)
        response = client.recv(1 << 12).decode('ascii')
        print(response)


if __name__ == '__main__':
    main()

<强> UDPServer.py

#! /usr/bin/env python3
import argparse
import socketserver


def main():
    parser = argparse.ArgumentParser(description='Execute a UDP server demo.')
    parser.add_argument('port', type=int, help='where the server will listen')
    arguments = parser.parse_args()
    host = socketserver.socket.gethostbyname(socketserver.socket.gethostname())
    address = host, arguments.port
    server = socketserver.ThreadingUDPServer(address, ClientRequestHandler)
    server.serve_forever()


class ClientRequestHandler(socketserver.DatagramRequestHandler):

    def handle(self):
        message = self.rfile.read().decode('ascii')
        print('Received:', message)
        response = 'Received: {}'.format(message).encode('ascii')
        self.wfile.write(response)


if __name__ == '__main__':
    main()

重复UDP通信

1 个答案: