PythonSocket編程服務器和多個客戶端存盤資料失敗

我目前正在游戲服務器上進行一個簡單的學校專案。我有一個處理 TCPserver 中修改資料的概念性問題。

我為這些問題創建了一個簡單的程式。客戶端將首先鍵入一個數字，然后該數字將發送到服務器。該數字將在服務器中通過加 1 進行處理，服務器會將修改后的數字發送回客戶端。此外，修改后的號碼也會保存到 中totalNum，其中存盤了所有客戶修改號碼的總和。

我希望服務器會“存盤”客戶端編號。例如，當客戶端 A 發送數字 5 時，totalNum將是 6。之后，當客戶端 B 發送數字 8 時，客戶端 A 的資料仍應保留在服務器中，我預計totalNum為 6 9 = 15。

服務器.py

#!/usr/bin/python3

import socket
import threading

class ServerThread(threading.Thread):
    def __init__(self, client):
        threading.Thread.__init__(self)
        self.client = client

    def run(self):
        connectionSocket, addr = self.client    

        totalNum = 0

        number = connectionSocket.recv(1024)
        newNumber = number.decode()
        newNumber = int(newNumber)
        editedNumber = newNumber   1
        #add the edited number to the totalNum in the server
        totalNum = editedNumber   totalNum
        print (totalNum)
        #change back to str for sending
        editedNumber = str(editedNumber)
        connectionSocket.send(editedNumber.encode())
        connectionSocket.close()

class ServerMain:
    def server_run(self):  
        serverPort = 12000
        serverSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        serverSocket.bind( ("", serverPort) )
        serverSocket.listen(5)
        print("The server is ready to receive")
        while True:
            client = serverSocket.accept()
            t = ServerThread(client)
            t.start()

if __name__ == '__main__':
    server = ServerMain()
    server.server_run()

客戶端.py

#!/usr/bin/python3

import socket

clientSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

serverName = "localhost"

serverPort = 12000

clientSocket.connect( (serverName, serverPort) )

# Get input for sending
number = input("Input a number:")

clientSocket.send(number.encode())

modifiednumber = clientSocket.recv(1024)

print("From Server:", modifiednumber.decode())

clientSocket.close()

更新的服務器代碼（更改totalNumto 類變數）：

#!/usr/bin/python3

import socket
import threading

class ServerThread(threading.Thread):
    totalNum = 0
    def __init__(self, client):
        threading.Thread.__init__(self)
        self.client = client

    def run(self):
        connectionSocket, addr = self.client   

        number = connectionSocket.recv(1024)
        newNumber = number.decode()
        newNumber = int(newNumber)
        editedNumber = newNumber   1
        #add the edited number to the totalNum in the server
        self.totalNum = editedNumber   self.totalNum
        print (self.totalNum)
        #change back to str for sending
        editedNumber = str(editedNumber)
        connectionSocket.send(editedNumber.encode())
        connectionSocket.close()

class ServerMain:
    def server_run(self):  
        serverPort = 12000
        serverSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        serverSocket.bind( ("", serverPort) )
        serverSocket.listen(5)
        print("The server is ready to receive")
        while True:
            client = serverSocket.accept()
            t = ServerThread(client)
            t.start()

if __name__ == '__main__':
    server = ServerMain()
    server.server_run()

uj5u.com熱心網友回復：

你很接近。移動totalNum = 0為類級別變數，即

class ServerThread(threading.Thread):
    totalNum = 0
    def __init__(self, client):

以及您totalNum使用它的任何地方ServerThread.totalNum

問題是您將 totalNum 作為范圍變數，因此每次完成時它都會丟失run()。如果我們創建了totalNum一個實體變數，就會出現問題。當run()結束時執行緒結束并且值再次丟失！通過使它成為一個類變數，它總是在那里并且總是共享的。你也可以從課外訪問它ServerThread.totalNum

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