ftp_client.py

import socket

client = socket.socket()
client.connect(('localhost',8080))

while True:
    cmd = input('>>>').strip()#input filename for download
    if not cmd:
        continue
    if cmd.startswith('get'):
        client.send(cmd.encode())
        file_total_size = int(client.recv(1024))
        print('文件的大小是',file_total_size)
        client.send('客户端以准备好了'.encode())
        received_size = 0
        filename = cmd.split()[1]
        f = open(filename,'wb')
        while received_size < file_total_size:
            data = client.recv(1024)
            received_size += len(data)
            print('已经接受大小：',received_size)
            f.write(data)
        else:
            print('接受到的文件总大小是：',received_size)
            f.close()

client.close()

ftp_server.py

import socket
import os

server = socket.socket()
server.bind(('0.0.0.0',8080))
server.listen()

while True:
    conn,addr = server.accept()#wait for connect
    print('the new connect is',addr)

    while True:
        print('等待新指令')
        data = conn.recv(1024)
        if not data:
            print('disconenct with client ')
            break
        cmd,filename = data.decode().split()
        print('文件名是：',filename)
        if os.path.isfile(filename):
            file_size = os.stat(filename).st_size
            conn.send(str(file_size).encode())#send file size to client
            client_ack = conn.recv(1024)
            print('来自客户端的确认信息：',client_ack.decode())
            
            f = open(filename,'rb')
            for line in f:#send file
                conn.send(line)
            f.close()
        print('send done')

server.close()

对传输文件进行md5加密检验

md5加密小代码回顾

import hashlib

m1 = hashlib.md5()
m1.update('admin'.encode())
print(m1.hexdigest())

print('*'*30)

m2 = hashlib.md5()
m2.update('adm'.encode())
m2.update('in'.encode())
print(m2.hexdigest())

ftp_client_md5.py

import socket
import hashlib

client = socket.socket()
client.connect(('localhost',8080))

while True:
    cmd = input('>>>').strip()#input filename for download
    if not cmd:
        continue
    if cmd.startswith('get'):
        client.send(cmd.encode())
        file_total_size = int(client.recv(1024))
        print('文件的大小是',file_total_size)
        client.send('客户端以准备好了'.encode())
        received_size = 0
        filename = cmd.split()[1]
        f = open(filename,'wb')
        m = hashlib.md5()
        while received_size < file_total_size:
            if file_total_size - received_size > 1024:
                size = 1024
            else:
                size = file_total_size - received_size
                # print('最后收到文件大小：',size)

            data = client.recv(size)
            m.update(data)
            received_size += len(data)
            f.write(data)
        else:
            print('接受到的文件总大小是：',received_size)
            f.close()

        server_file_md5 = client.recv(1024)
        print('server file md5:',server_file_md5.decode())
        print('client file md5:',m.hexdigest())

client.close()

ftp_server_md5.py

import socket
import os
import hashlib

server = socket.socket()
server.bind(('0.0.0.0',8080))
server.listen()

while True:
    conn,addr = server.accept()#wait for connect
    print('the new connect is',addr)

    while True:
        print('等待新指令')
        data = conn.recv(1024)
        if not data:
            print('disconenct with client ')
            break
        cmd,filename = data.decode().split()
        print('文件名是：',filename)
        if os.path.isfile(filename):
            file_size = os.stat(filename).st_size
            conn.send(str(file_size).encode())#send file size to client
            client_ack = conn.recv(1024)
            print('来自客户端的确认信息：',client_ack.decode())
            
            m = hashlib.md5()
            f = open(filename,'rb')
            for line in f:#send file
                conn.send(line)
                m.update(line)
            f.close()
            print('file md5:',m.hexdigest())
            conn.send(m.hexdigest().encode())
        print('send done')

server.close()