python实现用socket传输文件

python传输文件最重要的有两步:
1).将要传输的文件的信息发送过去,包括文件包,大小以及其它信息;
2).发送端读取文件内容并发送过去,接受端将缓存里面的内容写入文件.
发送端:

from socket import *
import os
import struct

ADDR = ('192.168.1.103',8000)
BUFSIZE = 1024
filename = 'client.py'
FILEINFO_SIZE=struct.calcsize('128s32sI8s')

sendSock = socket(AF_INET,SOCK_STREAM)
sendSock.connect(ADDR)

fhead=struct.pack('128s11I',filename,0,0,0,0,0,0,0,0,os.stat(filename).st_size,0,0)
sendSock.send(fhead)

fp = open(filename,'rb')
while 1:
    filedata = fp.read(BUFSIZE)
    if not filedata: break
    sendSock.send(filedata)
fp.close()

sendSock.close()

接收端:

# -*- coding: cp936 -*-
from socket import *
import struct

ADDR = ('192.168.1.103',8000)
BUFSIZE = 1024
FILEINFO_SIZE=struct.calcsize('128s32sI8s')

recvSock = socket(AF_INET,SOCK_STREAM)
recvSock.bind(ADDR)
recvSock.listen(True)

print "wait..."
conn,addr = recvSock.accept()
print "send from ",addr

fhead = conn.recv(FILEINFO_SIZE)
filename,temp1,filesize,temp2=struct.unpack('128s32sI8s',fhead)
#print filename,temp1,filesize,temp2
print filename,len(filename),type(filename)
print filesize

filename = 'new_'+filename.strip('\00') #...
fp = open(filename,'wb')
restsize = filesize
while 1:
    if restsize > BUFSIZE:
        filedata = conn.recv(BUFSIZE)
    else:
        filedata = conn.recv(restsize)
    if not filedata: break
    fp.write(filedata)
    restsize = restsize-len(filedata)
    if restsize == 0: break
fp.close()

conn.close()
recvSock.close()

print "Finished"


代码中,将文件信息采用struct的方式传送过去.接收端接收并unpack.整个过程发送和接受各两次,这便是整个的过程.