#main.py
import socketserver,json,os,hashlib
class MyTcpHandler(socketserver.BaseRequestHandler):
    def put(self,*args):
        cmd_dic=args[0]
        filename=cmd_dic["filename"]
        filesize=cmd_dic["size"]
        if os.path.isfile(filename):
            f=open(filename+".new",'wb')
        else:
            f=open(filename,'wb')
        self.request.send(b'200 ok')
        received_size=0
        m=hashlib.md5()
        while received_size             data=self.request.recv(1024)
            m.update(data)
            f.write(data)
            received_size+=len(data)
        else:
            uploaded_file_md5=m.hexdigest()
            self.request.send(b"ready recive your md5")
            client_file_md5=self.request.recv(1024)
            print("client_file_md5:",client_file_md5.decode())
            print("uploaded_file_md5:",uploaded_file_md5)
            print("file [%s] has uploaded..."%filename)
    def get(self,*args):
        cmd_dic=args[0]
        filename=cmd_dic["filename"]
        if os.path.isfile(filename):
            f=open(filename,'rb')
            filesize=os.stat(filename).st_size
            self.request.send(str(filesize).encode())
            self.request.recv(1024)
            m = hashlib.md5()
            for line in f:
                m.update(line)
                self.request.send(line)
            else:
                print("file md5:", m.hexdigest())
                self.request.recv(1024)
                self.request.send(m.hexdigest().encode("utf-8"))
                print("file download  success...")
                f.close()
        else:
            print(filename,"is not exist")
    def handle(self):
        while True:
            try:
                self.data=self.request.recv(1024).strip()
                print("{} wrote:".format(self.client_address[0]))
                print(self.data.decode())
                cmd_dic=json.loads(self.data.decode())
                print("cmd_dic:",cmd_dic)
                action=cmd_dic["action"]
                if hasattr(self,action):
                    func=(getattr(self,action))
                    func(cmd_dic)
            except ConnectionResetError as e:
                print("error",e)
                break
if __name__=="__main__":
    HOST,PORT="localhost",5566
    server=socketserver.ThreadingTCPServer((HOST,PORT),MyTcpHandler)
    server.serve_forever()
    server.allow_reuse_address()

#client.py
 import socket,os,json,hashlib
 class Ftpclient(object):
     def __init__(self):
         self.client=socket.socket()
     def help(self):
         print("put/get/cd/pwd")
     def connect(self,ip,port):
         self.client.connect((ip,port))
     def interactive(self):
         while True:
             cmd=input("请输入要上传下载的文件:").strip()
             if len(cmd)==0:continue
             cmd_str=cmd.split()[0]
             if hasattr(self,cmd_str):
                 func=getattr(self,cmd_str)
                 func(cmd)
             else:
                 self.help()
     def put(self,*args):
         cmd_split=args[0].split()
         if len(cmd_split)>1:
             filename=cmd_split[1]
             if os.path.isfile(filename):
                 filesize=os.stat(filename).st_size
                 msg_dic={
                     "action":"put",
                     "filename":filename,
                     "size":filesize,
                     "overridden":True
                 }
                 self.client.send(json.dumps(msg_dic).encode("utf-8"))
                 server_response=self.client.recv(1024)
                 m=hashlib.md5()
                 f=open(filename,'rb')
                 for line in f:
                     m.update(line)
                     self.client.send(line)
                 else:
                     print("file md5:", m.hexdigest())
                     self.client.recv(1024)
                     self.client.send(m.hexdigest().encode("utf-8"))
                     print("file upload success...")
                     f.close()
             else:
                 print(filename,"is not exist")
     def get(self,*args):
         cmd_split=args[0].split()
         if len(cmd_split)>1:
             filename=cmd_split[1]
             msg_dic={
                     "action":"get",
                     "filename":filename,
                     "overridden":True
             }
             self.client.send(json.dumps(msg_dic).encode("utf-8"))
             received_size = 0
             m = hashlib.md5()
             f=open(filename+".download",'wb')
             server_response=self.client.recv(1024)
             file_total_size=int(server_response.decode())
             self.client.send(b"ready to recv file")
             while received_size < file_total_size:
                 if file_total_size - received_size > 1024:
                     size=1024
                 else:
                     size=file_total_size - received_size
                 data = self.client.recv(size)
                 m.update(data)
                 f.write(data)
                 received_size += len(data)
             else:
                 download_file_md5 = m.hexdigest()
                 self.client.send(b"ready recive your md5")
                 servrer_file_md5 = self.client.recv(1024)
                 print("server_file_md5:",servrer_file_md5.decode())
                 print("download_file_md5:",download_file_md5)
                 print("file [%s] has download..."%filename)
                 print("源文件和下载文件大小分别为:",received_size,file_total_size)
 ftp=Ftpclient()
 ftp.connect("localhost",5566)
 ftp.interactive()