#!/usr/bin/env python
# -*-coding:utf-8 -*-
import socket, struct, json
download_dir = r'D:\Python\python_learning\gd\code\part3\02網(wǎng)絡(luò)編程\文件傳輸\client\download'
gd_client=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
gd_client.connect(('127.0.0.1',8123))

 #1、發(fā)命令
  cmd=input('>>: ').strip() #get a.txt
  if not cmd:continue
  gd_client.send(cmd.encode('utf-8'))
  #2、以寫的方式打開一個(gè)新文件，接收服務(wù)端發(fā)來(lái)的文件的內(nèi)容寫入客戶的新文件
  #第一步：先收?qǐng)?bào)頭的長(zhǎng)度
  obj=gd_client.recv(4)
  header_size=struct.unpack('i',obj)[0]
  # 第二步：再收?qǐng)?bào)頭
  header_bytes = gd_client.recv(header_size)
  # 第三步：從報(bào)頭中解析出對(duì)真實(shí)數(shù)據(jù)的描述信息
  header_json = header_bytes.decode('utf-8')
  header_dic = json.loads(header_json)
  '''
  header_dic = {
    'filename': filename, # 1.txt
    'file_size': os.path.getsize(r'%s\%s' % (share_dir, filename)) # 路徑/1.txt
  }  
  '''
  total_size = header_dic['file_size']
  file_name = header_dic['filename']
  # 第四步：接收真實(shí)的數(shù)據(jù)
  with open(r'%s\%s'%(download_dir, file_name),'wb') as f:
    recv_size = 0
    while recv_size < total_size:
      line = gd_client.recv(1024)
      f.write(line)
      recv_size += len(line)
      print('總大?。?s  已下載大小：%s' % (total_size, recv_size))
gd_client.close()​

#!/usr/bin/env python
# -*-coding:utf-8 -*-
import socket
import subprocess
import struct
import json
import os
share_dir = r'D:\Python\python_learning\gd\code\part3\02網(wǎng)絡(luò)編程\文件傳輸\server\share'
gd_server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
gd_server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
gd_server.bind(('127.0.0.1', 8123)) # 0-65535: 0-1024給操作系統(tǒng)使用
gd_server.listen(5)
while True:
  conn, client_addr = gd_server.accept()
  while True: # 通信循環(huán)
    try:
      # 1、收命令
      res = conn.recv(8096) # b'get 1.txt'
      if not res: break # 適用于linux操作系統(tǒng)
      # 2、解析命令，提取相應(yīng)命令參數(shù)
      cmds = res.decode('utf-8').split() # ['get','1.txt']
      filename = cmds[1]
      # 3、以讀的方式打開文件,讀取文件內(nèi)容發(fā)送給客戶端
      # 第一步：制作固定長(zhǎng)度的報(bào)頭
      header_dic = {
        'filename': filename, # 1.txt
        'file_size':os.path.getsize(r'%s\%s'%(share_dir, filename)) # 路徑/1.txt
      }
      header_json = json.dumps(header_dic)
      header_bytes = header_json.encode('utf-8')
      # 第二步：先發(fā)送報(bào)頭的長(zhǎng)度
      conn.send(struct.pack('i',len(header_bytes)))
      # 第三步:再發(fā)報(bào)頭
      conn.send(header_bytes)
      # 第四步：再發(fā)送真實(shí)的數(shù)據(jù)
      with open('%s/%s'%(share_dir, filename),'rb') as f:
        for line in f:
          conn.send(line)
    except ConnectionResetError: # 適用于windows操作系統(tǒng)
      break
  conn.close()
gd_server.close()​