import socket,os,hashlib

server = socket.socket()

server.bind(('0.0.0.0',9999))

server.listen()

while True:

    conn,addr = server.accept()

    print("new conn:",addr)

    while True:

        print("server on....")

        data = conn.recv(1024)

        if not data:

            print("客户端已断开")

            break

        cmd,filename = data.decode().split()

        print(filename)

        if os.path.isfile(filename): #是否是文件

            f = open(filename,"rb")

            m = hashlib.md5() #创建md5校验

            file_size = os.stat(filename).st_size #获取文件大小

            conn.send(str(file_size).encode()) #发送文件大小

            conn.recv(1024) #等待ACK交互防止粘包

            for line in f:

                m.update(line) #递增加密文件

                conn.send(line)

            print("file md5",m.hexdigest()) #打印16进制md5

            f.close()

            conn.send(m.hexdigest().encode())

        print("send done")

server.close()

import socket

import hashlib

client = socket.socket()

client.connect(('localhost',9999))

while True:

    cmd = input(">>:").strip()

    if len(cmd) == 0:continue

    if cmd.startswith("get"): #是否以get开头

        client.send(cmd.encode())

        server_response = client.recv(1024)

        print("server respoense:",server_response)

        client.send(b"ready to recv file")　　#发送ACK确认，交互防止send粘包

        file_total_size = int(server_response.decode())

        received_size = 0

        filename = cmd.split()[1]

        f = open(filename + ".new","wb")

        m = hashlib.md5() #使用md5加密

        while received_size < file_total_size:　　#判断总数据比递增接收数据大就成立

            if file_total_size - received_size > 1024: #数据比recv大就成立

               size = 1024

            else: #最后一次，还剩多少

               size = file_total_size - received_size　　#求出剩余recv数值

               print("last receive:",size) #最后一次收了多少

            data = client.recv(size)

            received_size += len(data)　　#递增接收数据

            m.update(data) #递增接收数据并加密md5

            f.write(data)

            #print(file_total_size,received_size) #每次发送大小

        else:

            new_file_md5 = m.hexdigest()

            print("file recv done",received_size,file_total_size)

            f.close()

        server_file_md5 = client.recv(1024)

        print("server file md5:",server_file_md5)

        print("client file md5:",new_file_md5)

client.close()