Tcp套接字用于发送和接收文件，使用python

Question

我正在尝试制作一个简单的客户端-服务器程序，以便使用tcp套接字发送和接收文件表单服务器。只要从服务器获取文件不是问题，服务器就会创建一个同名文件，并将数据放入该文件中，但当将文件放入服务器时，有时效果很好，但总是有机会，所以大多数情况下，服务器都是将文件名和文件内容一起获取，而不是将其写入文件，而是将文件名与内容作为新文件名写入，而该文件仍然为空。如果有人能提出任何解决方案，那将是非常有帮助的。

服务器.py

import socket
import sys
HOST = 'localhost'
PORT = 3820
socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
socket.bind((HOST, PORT))
socket.listen(1)
while (1):
conn, addr = socket.accept()
print 'New client connected ..'
reqCommand = conn.recv(1024)
print 'Client> %s' %(reqCommand)
if (reqCommand == 'quit'):
break
#elif (reqCommand == lls):
#list file in server directory
else:
string = reqCommand.split(' ', 1)   #in case of 'put' and 'get' method
reqFile = string[1]
if (string[0] == 'put'):
with open(reqFile, 'wb') as file_to_write:
data=conn.recv(1024)
while True:
if not data:
break
else:
file_to_write.write(data)
data=conn.recv(1024)
file_to_write.close()
break
print 'Receive Successful'
elif (string[0] == 'get'):
with open(reqFile, 'rb') as file_to_send:
for data in file_to_send:
conn.sendall(data)
print 'Send Successful'
conn.close()
socket.close()

客户端.py

import socket
import sys
HOST = 'localhost'    # server name goes in here
PORT = 3820

def put(commandName):
socket1 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
socket1.connect((HOST, PORT))
socket1.send(commandName)
string = commandName.split(' ', 1)
inputFile = string[1]
with open('clientfolder/'+inputFile, 'rb') as file_to_send:
data=file_to_send.read(1024)
while(data):
socket1.send(data)
data=file_to_send.read(1024)
file_to_send.close()
print 'PUT Successful'
socket1.close()
return

def get(commandName):
socket1 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
socket1.connect((HOST, PORT))
socket1.send(commandName)
string = commandName.split(' ', 1)
inputFile = string[1]
with open('clientfolder/'+inputFile, 'wb') as file_to_write:
while True:
data = socket1.recv(1024)
# print data
if not data:
break
# print data
file_to_write.write(data)
file_to_write.close()
print 'GET Successful'
socket1.close()
return

msg = raw_input('Enter your name: ')
while(1):
print 'Instruction'
print '"put [filename]" to send the file the server '
print '"get [filename]" to download the file from the server '
print '"ls" to list all files in this directory'
print '"lls" to list all files in the server'
print '"quit" to exit'
sys.stdout.write('%s> ' % msg)
inputCommand = sys.stdin.readline().strip()
if (inputCommand == 'quit'):
socket.send('quit')
break
# elif (inputCommand == 'ls')
# elif (inputCommand == 'lls')
else:
string = inputCommand.split(' ', 1)
if (string[0] == 'put'):
put(inputCommand)
elif (string[0] == 'get'):
get(inputCommand)
#current working directory is server location
#get will get file from current directory to clientfolder directory.

Answer 1

TCP是一个流协议，因此您必须在协议中设计消息中断。例如：

s.send('put filename')
s.send('data')

可以接收为：

s.recv(1024)
# 'put filenamedata'

所以缓冲接收到的数据，只提取完整的消息。一种方法是在消息之前发送消息的大小。