day36 作业

客户端

import struct
import json
from socket import *

client=socket(AF_INET,SOCK_STREAM)
# client.connect(('121.36.98.49',8822))
client.connect(('127.0.0.1',8811))

while True:
    cmd=input('请输入命令（dw or up +文件）>>：').strip()
    if len(cmd) == 0:continue
    client.send(cmd.encode('utf-8'))

    # 接收端
    # 1、先手4个字节，从中提取接下来要收的头的长度
    x=client.recv(4)
    print(x)
    header_len=struct.unpack('i',x)[0]

    # 2、接收头，并解析
    json_str_bytes=client.recv(header_len)
    json_str=json_str_bytes.decode('utf-8')
    header_dic=json.loads(json_str)
    print(header_dic)
    total_size=header_dic["file_size"]

    # 3、接收真实的数据
    recv_size = 0
    while recv_size < total_size:
        recv_data=client.recv(1024)
        recv_size+=len(recv_data)
        with open(f"my{header_dic['file_name']}",'wb') as f :
            f.write(recv_data)
    else:
        print()

服务端

import struct
import json
from socket import *


server = socket(AF_INET, SOCK_STREAM)
server.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
server.bind(('127.0.0.1',8811))
# server.bind(('0.0.0.0',8812))
server.listen(5)

while True:
    conn, client_addr = server.accept()

    while True:
        try:
            cmd = conn.recv(1024)
            if len(cmd) == 0: break
            cmd = cmd.decode('utf-8')
            cmd = cmd.split(',')
            print(cmd[0],cmd[1])
            if cmd[0] == 'up':
                pass # 执行上传
            elif cmd[0] == 'dw': # 执行下载
                print('开始传送')
                with open(f'/hz/{cmd[1]}','rb') as f :
                    file_data = f.read()
                    print(file_data)
                    print('传送完毕')
                file_size = len(file_data)
                header_dic = {
                    "mode": cmd[0],
                    'file_name':cmd[1],
                    "file_size": file_size,
                }
                print(header_dic)
                json_str = json.dumps(header_dic)
                json_str_bytes = json_str.encode('utf-8')
                x = struct.pack('i', len(json_str_bytes))
                print(x)
                conn.send(x)
                conn.send(json_str_bytes)
                conn.send(file_data)


        except Exception:
            break
    conn.close()