如何制作始终使用套接字侦听的服务器？

Question

建立一个基本的命令服务器：

import socket
import time
import random

server_socket = socket.socket()
server_socket.bind(('0.0.0.0', 8821))

server_socket.listen(1)

(client_socket, client_address) = server_socket.accept()

client_input = client_socket.recv(1024)
client_input = client_input.upper()


if client_input == 'TIME':
    client_socket.send(time.strftime("%c"))
elif client_input == 'RAND':
    client_socket.send(str(random.randrange(0, 11)))
elif client_input == 'NAME':
    client_socket.send("My master called me \"Arik\". Funny, ha?")
else:
    client_socket.send("Unknown command")

if len(client_input) > 4 or len(client_input) < 4:
    client_socket.send("The length of your messege\nneeds to be 4 chracters.\nI know only 4 commands.\nRAND, TIME, NAME & EXIT.\nThanks.")


client_socket.close()
server_socket.close()

和一个基本的客户：

import socket
my_socket = socket.socket()
my_socket.connect(('127.0.0.1', 8820))

message = raw_input("Insert Command\n")
my_socket.send(message)

data = my_socket.recv(1024)
print "Answer Sent: " + data

my_socket.close()

现在我想让服务器一直听命令，直到他得到一个“退出”命令。我不太明白这样做的方法，所以我希望你能帮助我。非常感谢！

Answer 1

我自己从未使用过 python 网络，但我认为这会起作用。 你可以把你的服务器监听器放在一个循环中，如果它收到 EXIT 则打破循环。

while(true):
    server_socket.listen(1)

    (client_socket, client_address) = server_socket.accept()

    client_input = client_socket.recv(1024)
    client_input = client_input.upper()


    if client_input == 'TIME':
        client_socket.send(time.strftime("%c"))
    elif client_input == 'RAND':
        client_socket.send(str(random.randrange(0, 11)))
    elif client_input == 'NAME':
        client_socket.send("My master called me \"Arik\". Funny, ha?")
    elif client_input == 'EXIT':
          break;
    else:
        client_socket.send("Unknown command")

    if len(client_input) > 4 or len(client_input) < 4:
        client_socket.send("The length of your messege\nneeds to be 4 chracters.\nI know only 4 commands.\nRAND, TIME, NAME & EXIT.\nThanks.")

client_socket.close()
server_socket.close()

Answer 2

您可以简单地运行一个循环以继续从客户端接收，直到收到'exit'：

import socket
import time
import random

server_socket = socket.socket()
server_socket.bind(('0.0.0.0', 8821))

server_socket.listen(1)

(client_socket, client_address) = server_socket.accept()

while True:
    client_input = client_socket.recv(1024).upper()
    if len(client_input) > 4 or len(client_input) < 4:
        client_socket.send("The length of your messege\nneeds to be 4 chracters.\nI know only 4 commands.\nRAND, TIME, NAME & EXIT.\nThanks.")
    else:
        if client_input == 'TIME':
            client_socket.send(time.strftime("%c"))
        elif client_input == 'RAND':
            client_socket.send(str(random.randrange(0, 11)))
        elif client_input == 'NAME':
            client_socket.send("My master called me \"Arik\". Funny, ha?")
        elif client_input == 'EXIT':
            client_socket.send("Exiting.")
            break
        else:
            client_socket.send("Unknown command")

client_socket.close()
server_socket.close()

你的客户应该是：

import socket
my_socket = socket.socket()
my_socket.connect(('127.0.0.1', 8820))

message = ''
while message.upper() != 'EXIT':
    message = raw_input("Insert Command\n")
    my_socket.send(message)
    data = my_socket.recv(1024)
    print "Answer Sent: " + data

my_socket.close()