[英]Simple Python Server Client File Transfer
我正在進行這個簡單的python服務器-客戶端文件傳輸項目。 每側有兩個部分。 首先,客戶端將文件發送到服務器的第一部分。 然后,服務器添加一行並將文件發送回第二部分。
我的問題是,由於某種原因,每當我有返回文件代碼時,服務器代碼就會停留在接收狀態。 如果我要注釋掉代碼的第二部分,則服務器將接收客戶端發送的所有文件。 否則,它將在接收時凍結。 是的,客戶確實發送了它。
您可以忽略所有打印命令,只是在那里查看問題所在。
servercode:
import socket
ssFT = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
ssFT.bind((socket.gethostname(), 8756))
ssFT.listen(1)
while True:
(conn, address) = ssFT.accept()
text_file = 'fileProj.txt'
#Receive, output and save file
with open(text_file, "wb") as fw:
print("Receiving..")
while True:
print('receiving')
data = conn.recv(1024)
print('Received: ', data.decode('utf-8'))
if not data:
print('Breaking from file write')
break
fw.write(data)
print('Wrote to file', data.decode('utf-8'))
fw.close()
print("Received..")
#Append and send file
print('Opening file ', text_file)
with open(text_file, 'ab+') as fa:
print('Opened file')
print("Appending string to file.")
string = b"Append this to file."
fa.write(string)
fa.seek(0, 0)
print("Sending file.")
while True:
data = fa.read(1024)
conn.send(data)
if not data:
break
fa.close()
print("Sent file.")
break
ssFT.close()
客戶代碼:
import socket
csFT = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
csFT.connect((socket.gethostname(), 8756))
text_file = 'passphrase.txt'
#Send file
with open(text_file, 'rb') as fs:
#Using with, no file close is necessary,
#with automatically handles file close
while True:
data = fs.read(1024)
print('Sending data', data.decode('utf-8'))
csFT.send(data)
print('Sent data', data.decode('utf-8'))
if not data:
print('Breaking from sending data')
break
fs.close()
#Receive file
print("Receiving..")
with open(text_file, 'wb') as fw:
while True:
data = csFT.recv(1024)
if not data:
break
fw.write(data)
fw.close()
print("Received..")
csFT.close()
我使用Python 3在本地測試了您的代碼。
我看到的問題是服務器代碼中的conn.recv 。 由於conn.recv阻止了連接,因此它正在等待更多數據。
我發現的解決方案是向服務器發送命令,以通知數據傳輸的BEGIN和END,如下所示:
#Send file
with open(text_file, 'rb') as fs:
#Using with, no file close is necessary,
#with automatically handles file close
csFT.send(b'BEGIN')
while True:
data = fs.read(1024)
print('Sending data', data.decode('utf-8'))
csFT.send(data)
print('Sent data', data.decode('utf-8'))
if not data:
print('Breaking from sending data')
break
csFT.send(b'ENDED') # I used the same size of the BEGIN token
fs.close()
with open(text_file, "wb") as fw:
print("Receiving..")
while True:
print('receiving')
data = conn.recv(32)
if data == b'BEGIN':
continue
elif data == b'ENDED':
print('Breaking from file write')
break
else:
print('Received: ', data.decode('utf-8'))
fw.write(data)
print('Wrote to file', data.decode('utf-8'))
fw.close()
print("Received..")
Client.py完整代碼: https ://pastebin.com/LySsgEe4
Server.py完整代碼: https ://pastebin.com/KADZpqkM
希望對您有所幫助!
我解決此問題的方法是先發送文件大小,然后服務器在收到整個文件后就可以立即停止等待。 我不知道是否有更好的解決方案,但這就像一個魅力:
BUFFER_SIZE = 1024
client.py
import os
fsize = os.path.getsize(text_file)
csFT.send(str(fsize).encode('utf-8'))
with open(text_file, 'rb') as fs:
data = fs.read(BUFFER_SIZE)
while data:
csFT.send(data)
data = fs.read(BUFFER_SIZE)
server.py
with open(text_file, 'wb') as fw:
msg = ssFT.recv(BUFFER_SIZE)
fsize = int(msg.decode('utf-8'))
rsize = 0
while True:
data = ssFT.recv(BUFFER_SIZE)
rsize = rsize + len(data)
fw.write(data)
if rsize >= fsize:
print('Breaking from file write')
break
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