使用套接字編程在python中創建消息傳遞系統

Question

我是socket編程的新手。 我想在服務器和客戶端之間創建一個簡單的消息傳遞系統（聊天）。 我在下面提供了我的代碼。 我希望它能像聊天系統一樣工作，但它不起作用。 如果消息被發送，它應該接收並打印出來但僅在給出輸入后打印接收的字符串。 我期待它應該並行運行（接收消息並發送消息）。

服務器：

import socket
import time
import threading

def get(s):
    tm = s.recv(1024)
    print("\nReceived: ",tm.decode('ascii'))

def set_(s):
    i=input("\nEnter : ")
    s.send(i.encode('ascii'))

 serversocket = socket.socket()
 host = socket.gethostname()
 port = 9981
 serversocket.bind((host,port))
 serversocket.listen(1)
 clientsocket,addr = serversocket.accept()
 while(1):
    t1=threading.Thread( target = get ,  args = (clientsocket,) )
    t1.start()
    t2=threading.Thread( target = set_ ,  args = (clientsocket,) )
    t2.start()
    time.sleep(10)
clientsocket.close()

客戶：

import socket
import threading
import time
def get(s):
    tm = s.recv(1024)
    print("\nReceived: ",tm.decode('ascii'))    

def set_(s):
    i=input("\nEnter : ")
    s.send(i.encode('ascii'))

s = socket.socket()
host = socket.gethostname()
port = 9981
s.connect((host,port))

while(1):
    t1=threading.Thread( target = get ,  args = (s,) )
    t2=threading.Thread( target = set_ , args = (s,) )
    t1.start()
    t2.start()
    time.sleep(10)
s.close()

輸出（在客戶端）：

Enter: hello ------------------------------>(1)

Received: hello --------------------------->(3)

輸出（在服務器上）：

Enter: hello ------------------------------>(2)

Received :  hello ------------------------->(4)

預期產出：

輸出（在客戶端）：

Enter: hello ------------------------------>(1)

Received: hello --------------------------->(4)

輸出（在服務器上）：

Received :  hello ------------------------->(2)

Enter: hello ------------------------------>(3)

數字代表執行順序。

Answer 1

程序的線程邏輯存在問題。 您應該將while(True)循環移動到線程工作者，並且只啟動一次線程。 就目前而言，您的代碼每10秒只能發送/接收一條消息。

服務器：

import socket
import threading

def get(s):
    while True:
        tm = s.recv(1024)
        print("\nReceived: ",tm.decode('ascii'))

def set_(s):
    while True:
        i=input("\nEnter : ")
        s.send(i.encode('ascii'))

serversocket = socket.socket()
host = socket.gethostname()
port = 9981
serversocket.bind((host,port))
serversocket.listen(1)
clientsocket,addr = serversocket.accept()
t1=threading.Thread( target = get ,  args = (clientsocket,) )
t1.start()
t2=threading.Thread( target = set_ ,  args = (clientsocket,) )
t2.start()

客戶：

import socket
import threading

def get(s):
    while True:
        tm = s.recv(1024)
        print("\nReceived: ",tm.decode('ascii'))

def set_(s):
    while True:
        i=input("\nEnter : ")
        s.send(i.encode('ascii'))

s = socket.socket()
host = socket.gethostname()
port = 9981
s.connect((host,port))
t1=threading.Thread( target = get ,  args = (s,) )
t2=threading.Thread( target = set_ , args = (s,) )
t1.start()
t2.start()

您需要以不同的方式處理關閉套接字，並且由於程序的多線程特性，輸入/接收的打印在第一條消息之后變得不同步，但輸入仍在等待。