Python服务器-客户端网络关系问题

Question

我为我的网络类编写了一个程序，通过通过套接字发送文件并计时传输来测量上传和下载速度，并且我使用了Python。我遇到的问题是，服务器和客户端在同一台机器上运行时可以很好地通信，但一旦我将服务器程序放到网络上的另一台机器上，就不会发生文件传输。它们相互通信(客户端说“已连接到服务器”，服务器说“来自xxx.xxx的连接”)，但文件传输大小和速度显示为0和0。

以下是服务器代码：

import util
import socket
import os
import shutil
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = ""
port = 12345
f = open("receivedfromclient.txt", "r+")
print "Waiting for clients..."
s.bind((host, port))
s.listen(5)
c, addr = s.accept()
print "Client connected:", addr
start = time.clock()
msg = c.recv(257024)
stop = time.clock()
duration = stop-start
f.write(str(msg))
b = os.path.getsize("receivedfromclient.txt")
print "File size = ", b, "bits"
print "Time to transfer from client  = ", duration, " seconds"
bw = (b/duration)/1048576
print "The upload bit rate is ", bw, "Mpbs"
f.close()
shutil.copy("receivedfromclient.txt", "sendtoclient.txt")
f.open("sendtoclient.txt")
c.send(f.read())
f.close()
c.close()
s.close()

客户端代码类似于：

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = raw_input("Please enter host address: ")#socket.gethostname()
port = 12345
sendfile = raw_input("Please enter name of file to transfer: ")
f = open(sendfile,"rb")
g = open("receivedfromserver.txt","w")
print "Connecting to ", host, port
s.connect((host, port))
s.send(f.read())

诸若此类。有人能告诉我我哪里做错了吗？

Answer 1

嗯-至少有一些问题：

主要的一点是，我不清楚你真正想做的是什么。

以下是您的代码和一些备注：

# import util <-- NOT NEEDED
import socket
import os
import shutil
import time # <-- Added
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = ""
port = 12345
f = open("receivedfromclient.txt", "r+")
print "Waiting for clients..."
s.bind((host, port))
s.listen(5)
c, addr = s.accept() # <-- FORGOTTEN ()
print "Client connected:", addr
start = time.clock()
msg = c.recv(257024) # <-- You need some loop here to get the whole file
stop = time.clock()
duration = stop-start
f.write(str(msg))
b = os.path.getsize("receivedfromclient.txt") # <-- = instead of .
print "File size = ", b, "bits"
print "Time to transfer from client  = ", duration, " seconds"
bw = (b/duration)/1048576
print "The upload bit rate is ", bw, "Mpbs"
f.close()
shutil.copy("receivedfromclient.txt", "sendtoclient.txt")
f.open("sendtoclient.txt")
c.send(f.read())
f.close()
c.close()
s.close()

这里的一个问题是，start在大多数情况下都等于stop -所以在(b/duration)中你会得到一个除以零的错误。

在客户端部分，至少缺少一个import socket；根本不需要g。

请进一步解释一下，你想做什么。

如果你想传输文件，有很多方法(sftp，rsync，nc，...)。