模拟服务器和客户端交互脚本

模拟服务器和客户端交互&＃xff1a;

import argparse, socket
from datetime import datetimeIP &＃61; "127.0.0.1"
CODING &＃61; "utf8"
MAX_BYTES &＃61; 65535 # UDP最大长度def server(port): # port&＃xff1a;端口号sock &＃61; socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # SOCK_DGRAM表示使用udp&＃xff0c;SOCK_STREAM表示TCPsock.bind((IP, port)) # 表示进程启动后监听port端口print("Listing at {}".format(sock.getsockname())) #getsockname返回&＃xff08;ip&＃xff0c;port&＃xff09;while True: # 不停的接收客户消息&＃xff0c;然后告诉客户消息的长度data, address &＃61; sock.recvfrom(MAX_BYTES) # 接受客户端发来的消息&＃xff0c;data表示消息数据&＃xff0c;address表示客户地址text &＃61; data.decode(CODING) # 使用utf8解码二进制流&＃xff0c;还原成字符串print(&＃39;The client at {} says {}&＃39;.format(address, text))text &＃61; &＃39;Your data was {} bytes long&＃39;.format(len(data))sock.sendto(text.encode(CODING), address)def client(port):sock &＃61; socket.socket(socket.AF_INET, socket.SOCK_DGRAM)text &＃61; &＃39;The time is {}&＃39;.format(datetime.now())sock.sendto(text.encode(CODING), ("127.0.0.1", port))print(&＃39;The os assigned me the address {}&＃39;.format(sock.getsockname())) # 客户程序的端口号是操作系统随机分配的&＃xff0c;每次进程启动端口都会变化data, address &＃61; sock.recvfrom(MAX_BYTES)print(&＃39;The server {} replied {}&＃39;.format(address, data.decode(CODING)))if __name__ &＃61;&＃61; &＃39;__main__&＃39;:choices &＃61; {&＃39;client&＃39;: client, &＃39;server&＃39;: server}parser &＃61; argparse.ArgumentParser(description&＃61;&＃39;Send and receive UDP locally&＃39;)parser.add_argument(&＃39;role&＃39;, choices&＃61;choices, help&＃61;&＃39;which orle to play: client or server.&＃39;)parser.add_argument(&＃39;-p&＃39;, metavar&＃61;&＃39;PORT&＃39;, type&＃61;int, default&＃61;1060, help&＃61;&＃39;UDP port(defuault 1060)&＃39;)args &＃61; parser.parse_args()function &＃61; choices[args.role]function(args.p)

结果&＃xff1a;

服务端&＃xff1a;

客户端&＃xff1a;
每次是随机端口