import socket
def main():
  tcp_client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  # 服務(wù)器位于本機(jī) 9999
  tcp_client_socket.connect( ("192.168.27.72", 9999) )
  # 告訴服務(wù)器，我要下載哪一個(gè)文件
  file_name = input("請(qǐng)輸入要下載的文件名:")
  tcp_client_socket.send(file_name.encode("utf-8"))
  temp = tcp_client_socket.recv(1024)
  print(temp)
  file_length = int(temp.decode("utf-8"))
  # 接收數(shù)據(jù) 字節(jié)
  recv_data = tcp_client_socket.recv(file_length)
  # 得到數(shù)據(jù)，需要將數(shù)據(jù)寫入文件
  if recv_data:
    # f = open("new_" + file_name, "wb")
    # try:
    #   f.write(recv_data)
    # except Exception as result:
    #   print("寫入文件錯(cuò)誤")
    # finally:
    #   f.close()
    with open("new_" + file_name, "wb") as f:
      f.write(recv_data)
  tcp_client_socket.close()
if __name__ == '__main__':
  main()

import socket
def main():
  #1創(chuàng)建套接字
  tcp_server_socket = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
  #2綁定本地信息bind
  tcp_server_socket.bind(('',9999))
  #3讓默認(rèn)的套接字由主動(dòng)變?yōu)楸粍?dòng)listen ????
  tcp_server_socket.listen(128)
  #4等待別人的電話到來（等待客戶端的鏈接 accept）
  new_client_socket, client_addr = tcp_server_socket.accept()
  #5調(diào)用發(fā)送文件函數(shù)，完成為客戶端服務(wù)
  rece_data = new_client_socket.recv(1024)
  file_name = rece_data.decode('utf-8')
  try:
    f = open(file_name, 'rb')
    content = f.read()
    file_length = len(content)
    print(file_length)
    new_client_socket.send(str(file_length).encode('utf-8'))   #????1兩個(gè)發(fā)送第二個(gè)執(zhí)行快了怎么辦？
    new_client_socket.send(content)
  except Exception as f:
    print('文件打開失敗')
  # 6關(guān)閉套接字
  new_client_socket.close()
  tcp_server_socket.close()
if __name__ == '__main__':
  main()