day34作业

文件上传与下载

服务端

import socket,struct,json

server = socket.socket()
server.bind(("127.0.0.1",3333))
server.listen(5)
while True:
    client,addr = server.accept()
    while True:
        try:
            ml = client.recv(1024).decode("utf-8")#模拟客户端请求报告
            if not ml:
                client.close()
                break
            if ml != "1":continue
            #开始资质表头
            filename = "总结"
            #计算文件bytes长度
            file_len = 0
            f = open(r"F:\Python_exe\day34\上午总结","rb")
            for line in f:
                line_len = len(line)
                file_len += line_len
            f.close()
            file_dict = {"filename":filename,"length":file_len}
            #将字典装换为json格式
            json_dict = json.dumps(file_dict)
            #再json字符串转为bytes
            byte_dict = json_dict.encode("utf-8")
            #计算字典二进制的长度
            head_len = len(byte_dict)
            #将长度打包成一个数据头
            head = struct.pack("i", head_len)
            client.send(head)
            client.send(byte_dict)
            #标记内容完成
            #传输正式内容
            with open(r"F:\Python_exe\day34\上午总结","rb") as f:
                for line in f:
                    client.send(line)


        except ConnectionResetError:
            print("连接错误连接")
            client.close()
            break

客户端

import socket,struct,json

client = socket.socket()
client.connect(("127.0.0.1",3333))

while True:
    ml = input(">>>:")
    if not ml:continue
    client.send(ml.encode("utf-8"))
    #获取字典的二进制
    bytes_len = client.recv(4)
    #还原
    head_len =struct.unpack('i', bytes_len)[0]
    #获取数据报头
    bytes_dict = client.recv(head_len)
    #将bytes类型转化为json格式
    json_dict = bytes_dict.decode("utf-8")
    #将字典json格式还原为成python的字典

    file_dict=json.loads(json_dict)
    #获取文件的名称
    filename = file_dict["filename"]
    #获取文件的传输长度
    file_len = file_dict["length"]
    #打开文件追加写
    f = open(filename,"ab")
    #当前接受长度
    data_len = 0

    while data_len<file_len:
        data = client.recv(1024)
        data_len += len(data)
        f.write(data)
    f.close()
    client.close()

client.close()

时间服务器

import time
import socket
server = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
server.bind(("127.0.0.1",4444))
while True:
    req,addr = server.recvfrom(1024)
    if not req:
        fmt = "%Y-%m-%d %X"
    else:
        fmt = req.decode("utf-8")
    back_msg = time.strftime(fmt)
    server.sendto(back_msg.encode("utf-8"),addr)

server.close()

服务端

import socket
client = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)

while True:
    time_fmt = input("请输入时间格式 %Y %m %d等")
    client.sendto(time_fmt.encode("utf-8"),("127.0.0.1",4444))

    time,addr = client.recvfrom(1024)
    print(time.decode("utf-8"))

客户端