Question

我已经编写了以下用于文件传输的python代码。它在localhost环境中工作正常。它在两台不同的物理机器之间失败。我得到的文件，但数据不完整。将文件大小发送到客户端时将字符串转换为long时也存在无效的文字错误。我无法弄清楚为什么？

server.py

from socket import *
import thread
import os

l = {}
def handler(clientsocket, clientaddr):
    print "Accepted connection from: ", clientaddr 
    while 1:
        data = clientsocket.recv(8192)
        if not data:
            break
        else:           
            print "The following data was received - ",data
            l[clientaddr] = data
            print l
            print "Opening file - ",data
            fp = open(data,'r')
            size = os.path.getsize(data)
            clientsocket.send(str(size))
            strng = "hi"
            print size
            while size > 0:
                strng = fp.read(8192)
                clientsocket.send (strng)
                size = size - 8192

    clientsocket.close()



if __name__ == "__main__":

    host = 'localhost'
    port = 55573
    buf = 8192

    addr = (host, port)

    serversocket = socket(AF_INET, SOCK_STREAM)

    serversocket.bind(addr)

    serversocket.listen(5)

    while 1:
        print "Server is listening for connections\n"

        clientsocket, clientaddr = serversocket.accept()
        thread.start_new_thread(handler, (clientsocket, clientaddr))
    serversocket.close()

client.py

from socket import *
import os
if __name__ == '__main__':

    host = '10.1.99.176'
    port = 55573
    buf = 8192

    addr = (host, port)

    clientsocket = socket(AF_INET, SOCK_STREAM)

    clientsocket.connect(addr)

    while 1:
        fname = raw_input("Enter the file name that u want>> ")
        if not fname:
            break
        else:
            clientsocket.send(fname)
            print "\nThe file will be saved and opened- "
            fname = '/home/coep/Downloads/'+fname
            nf = open(fname,"a")
            strng = "hi"
            size = clientsocket.recv(16)
            size = long(size)
            print size  
            while size > 0:
                strng = clientsocket.recv(8192)
                        if not strng:
                            break
                        nf.write(strng)
                size = size - 8192
                if size > 500000:
                    print size

            nf.close()
            fname = 'viewnior '+ fname
            print fname
            os.system(fname)

Answer 1

在server.py中，您正在使用

host ='localhost'，它只是将端口绑定到localhost IP地址，即127.0.0.1。

将其更改为host ='0.0.0.0'，它会将特定端口绑定到所有可用接口。

更新：另一个原因可能是缓冲区大小太大而且有8192，它可能永远被阻止，因为上次传输永远无法填充缓冲区。要绕过它，如果缓冲区没有填满，请将超时设置为makeure以继续。在client.py中，尝试更改，

    clientsocket.timeout(5)
    while size > 0:
            try:
                strng = clientsocket.recv(8192)
                if not strng:
                    break
                nf.write(strng)
                size = size - 8192
                if size > 500000:
                    print size
             except:
                 nf.write(string)

8192也是相当大的尺寸，并尝试将大小减小到1000-1300字节。 Chossing 8192没有给你带来任何好处，因为数据包仍将在片段上移动，MTU上限通常为1436字节。

Python文件传输仅适用于localhost，并且在两台计算机之间失败

1 个答案: