基于python3实现socket文件传输和校验

发布日期： 2026-01-12 阅读量： 作者： 用户投稿

基于socket的文件传输并进行MD5值校验，供大家参考，具体内容如下

文件传输分为两个类，一个是服务端，一个是客户端。

客户端发起发送文件或接收文件的请求，服务端收到请求后接收或发送文件，最后进行MD5值的校验

socket数据通过struct模块打包

需要发送文件到服务端时，调用sendFile函数，struct包内包含文件信息、文件大小、文件MD5等信息，服务端接收到文件后进行MD5值校验，校验成功后则返回成功

需要从服务器下载文件时，调用recvFile函数，收到文件后进行MD5校验

client类代码如下

import socket
import struct,os
import subprocess
 
dataFormat='8s32s100s100sl'
 
class fileClient():
 def __init__(self,addr):
  self.addr = addr
  self.action = ''
  self.fileName = ''
  self.md5sum = ''
  self.clientfilePath = ''
  self.serverfilePath = ''
  self.size = 0
 
 def struct_pack(self):
  ret = struct.pack(dataFormat,self.action.encode(),self.md5sum.encode(),self.clientfilePath.encode(),
       self.serverfilePath.encode(),self.size)
  return ret
 
 def struct_unpack(self,package):
  self.action,self.md5sum,self.clientfilePath,self.serverfilePath,self.size = struct.unpack(dataFormat,package)
  self.action = self.action.decode().strip('\x00')
  self.md5sum = self.md5sum.decode().strip('\x00')
  self.clientfilePath = self.clientfilePath.decode().strip('\x00')
  self.serverfilePath = self.serverfilePath.decode().strip('\x00')
 
 def sendFile(self,clientfile,serverfile):
  if not os.path.exists(clientfile):
   print('源文件/文件夹不存在')
   return "No such file or directory"
  self.action = 'upload'
  (status, output) = subprocess.getstatusoutput("md5sum " + clientfile + " | awk '{printf $1}'")
  if status == 0:
   self.md5sum = output
  else:
   return "md5sum error:"+status
  self.size = os.stat(clientfile).st_size
  self.serverfilePath = serverfile
  self.clientfilePath = clientfile
  ret = self.struct_pack()
  s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  try:
   s.connect(self.addr)
   s.send(ret)
   recv = s.recv(1024)
   if recv.decode() == 'dirNotExist':
    print("目标文件/文件夹不存在")
    return "No such file or directory"
   elif recv.decode() == 'ok':
    fo = open(clientfile, 'rb')
    while True:
     filedata = fo.read(1024)
     if not filedata:
      break
     s.send(filedata)
    fo.close()
    recv = s.recv(1024)
    if recv.decode() == 'ok':
     print("文件传输成功")
     s.close()
     return 0
    else:
     s.close()
     return "md5sum error:md5sum is not correct!"
  except Exception as e:
   print(e)
   return "error:"+str(e)
 
 def recvFile(self,clientfile,serverfile):
  if not os.path.isdir(clientfile):
   filePath,fileName = os.path.split(clientfile)
  else:
   filePath = clientfile
  if not os.path.exists(filePath):
   print('本地目标文件/文件夹不存在')
   return "No such file or directory"
  self.action = 'download'
  self.clientfilePath = clientfile
  self.serverfilePath = serverfile
  s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  try:
   s.connect(self.addr)
   ret = self.struct_pack()
   s.send(ret)
   recv = s.recv(struct.calcsize(dataFormat))
   self.struct_unpack(recv)
   if self.action.startswith("ok"):
    if os.path.isdir(clientfile):
     fileName = (os.path.split(serverfile))[1]
     clientfile = os.path.join(clientfile, fileName)
    self.recvd_size = 0
    file = open(clientfile, 'wb')
    while not self.recvd_size == self.size:
     if self.size - self.recvd_size > 1024:
      rdata = s.recv(1024)
      self.recvd_size += len(rdata)
     else:
      rdata = s.recv(self.size - self.recvd_size)
      self.recvd_size = self.size
     file.write(rdata)
    file.close()
    print('\n等待校验...')
    (status, output) = subprocess.getstatusoutput("md5sum " + clientfile + " | awk '{printf $1}'")
    if output == self.md5sum:
     print("文件传输成功")
    else:
     print("文件校验不通过")
     (status, output) = subprocess.getstatusoutput("rm " + clientfile)
   elif self.action.startswith("nofile"):
    print('远程源文件/文件夹不存在')
    return "No such file or directory"
  except Exception as e:
   print(e)
   return "error:"+str(e)

server类代码如下

import socket
import struct,os
import subprocess
import socketserver
 
dataFormat='8s32s100s100sl'
 
class fileServer(socketserver.StreamRequestHandler):
 def struct_pack(self):
  ret = struct.pack(dataFormat, self.action.encode(), self.md5sum.encode(), self.clientfilePath.encode(),
       self.serverfilePath.encode(), self.size)
  return ret
 
 def struct_unpack(self, package):
  self.action, self.md5sum, self.clientfilePath, self.serverfilePath, self.size = struct.unpack(dataFormat,
                          package)
  self.action = self.action.decode().strip('\x00')
  self.md5sum = self.md5sum.decode().strip('\x00')
  self.clientfilePath = self.clientfilePath.decode().strip('\x00')
  self.serverfilePath = self.serverfilePath.decode().strip('\x00')
 
 def handle(self):
  print('connected from:', self.client_address)
  fileinfo_size = struct.calcsize(dataFormat)
  self.buf = self.request.recv(fileinfo_size)
  if self.buf:
   self.struct_unpack(self.buf)
   print("get action:"+self.action)
   if self.action.startswith("upload"):
    try:
     if os.path.isdir(self.serverfilePath):
      fileName = (os.path.split(self.clientfilePath))[1]
      self.serverfilePath = os.path.join(self.serverfilePath, fileName)
     filePath,fileName = os.path.split(self.serverfilePath)
     if not os.path.exists(filePath):
      self.request.send(str.encode('dirNotExist'))
     else:
      self.request.send(str.encode('ok'))
      recvd_size = 0
      file = open(self.serverfilePath, 'wb')
      while not recvd_size == self.size:
       if self.size - recvd_size > 1024:
        rdata = self.request.recv(1024)
        recvd_size += len(rdata)
       else:
        rdata = self.request.recv(self.size - recvd_size)
        recvd_size = self.size
       file.write(rdata)
      file.close()
      (status, output) = subprocess.getstatusoutput("md5sum " + self.serverfilePath + " | awk '{printf $1}'")
      if output == self.md5sum:
       self.request.send(str.encode('ok'))
      else:
       self.request.send(str.encode('md5sum error'))
    except Exception as e:
     print(e)
    finally:
     self.request.close()
   elif self.action.startswith("download"):
    try:
     if os.path.exists(self.serverfilePath):
      (status, output) = subprocess.getstatusoutput("md5sum " + self.serverfilePath + " | awk '{printf $1}'")
      if status == 0:
       self.md5sum = output
      self.action = 'ok'
      self.size = os.stat(self.serverfilePath).st_size
      ret = self.struct_pack()
      self.request.send(ret)
      fo = open(self.serverfilePath, 'rb')
      while True:
       filedata = fo.read(1024)
       if not filedata:
        break
       self.request.send(filedata)
      fo.close()
     else:
      self.action = 'nofile'
      ret = self.struct_pack()
      self.request.send(ret)
    except Exception as e:
     print(e)
    finally:
     self.request.close()

调用server，并开启服务

import fileSocket
import threading
import socketserver
import time
 
serverIp = '127.0.0.1'
serverPort = 19821
serverAddr = (serverIp,serverPort)
 
class fileServerth(threading.Thread):
 def __init__(self):
  threading.Thread.__init__(self)
  self.create_time = time.time()
  self.local = threading.local()
 
 def run(self):
  print("fileServer is running...")
  fileserver.serve_forever()
 
fileserver = socketserver.ThreadingTCPServer(serverAddr, fileSocket.fileServer)
fileserverth = fileServerth()
fileserverth.start()

调用client，发送/接受文件

import fileSocket
 
serverIp = '127.0.0.1'
serverPort = 19821
serverAddr = (serverIp,serverPort)
 
fileclient = fileSocket.fileClient(serverAddr)
fileclient.sendFile('fromClientPath/file','toServerPath/file')
fileclient.recvFile('toClientPath/file','fromServerPath/file')

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。

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