Based socket UDP protocol

udp is no link, and then start the service can receive messages directly, no need to establish a link in advance

A, UDP basic use

Server

Import Socket 
Server = socket.socket (type = socket.SOCK_DGRAM)    # the UDP protocol 
server.bind (( ' 127.0.0.1 " , 8080 )) 

the while True: 
    Data, addr = server.recvfrom (1024 )
     Print ( ' Data: ' , Data)   # client message sent by the 
    Print ( ' address: ' , addr)   # client to address 
    server.sendto (data.upper (), addr)

server

 

Client

Import Socket 
Client = socket.socket (type = socket.SOCK_DGRAM) 
the server_address = ( ' 127.0.0.1 ' , 8080 )
 the while True: 
    client.sendto (B ' Hello ' , the server_address) 
    Data, addr = client.recvfrom (1024 )
     Print ( ' service data sent by the end ' , data)
     Print ( ' server address sent ' , addr)

client

 

Two, UDP achieve simple version of QQ

Server

import socket

server = socket.socket(type=socket.SOCK_DGRAM)
server.bind(('127.0.0.1',8080))

while True:
    data,addr = server.recvfrom(1024)
    print(data.decode('utf-8'))
    msg = input('>>>:')
    server.sendto(msg.encode('utf-8'),addr)

server

 

Client

import socket

client = socket.socket(type=socket.SOCK_DGRAM)
server_address = ('127.0.0.1',8080)

while True:
    msg = input('<<<:')
    msg = '来自客户端1的消息：%s'%msg
    client.sendto(msg.encode('utf-8'),server_address)
    data,server_addr = client.recvfrom(1024)
    print(data.decode('utf-8'))

client

Third, upload files operations

Server

import socket
import os
import json
import struct


server = socket.socket()
server.bind(('127.0.0.1',8080))
server.listen(5)

while True:
    conn,addr = server.accept()
    while True:
        try:
            header_len = conn.recv(4)
            # 解析字典报头
            header_len = struct.unpack('i',header_len)[0]
            #Then receiving data dictionary 
            header_dic = conn.recv (header_len) 
            real_dic = json.loads (header_dic.decode ( ' UTF-. 8 ' ))
             # acquires data length 
            total_size = real_dic.get ( ' FILE_SIZE ' )
             # loop receives and writes the file 
            = recv_size 0 
            with Open (real_dic.get ( ' file_name ' ), ' WB ' ) AS F:
                 the while recv_size < total_size: 
                    Data = conn.recv (1024 )
                    f.write(data)
                    recv_size += len(data)
                print('上传成功')
        except ConnectionResetError as e:
            print(e)
            break
    conn.close()

server

 

Client

Import socket
 Import json
 Import os
 Import struct 


Client = socket.socket () 
the client.connect (( ' 127.0.0.1 ' , 8080 )) 

the while True:
     # get movie listings cycle through 
    MOVIE_DIR = r ' D: \ Python full-time 10 video \ day25 \ video ' 
    movie_list = the os.listdir (MOVIE_DIR)
     # Print (movie_list) 
    for I, Movie in the enumerate (movie_list,. 1 ):
         Print (I, Movie)
     # user selects 
    choice = input (' Please to Upload >>> Choice Movie: ' )
     # determines whether the number 
    if choice.isdigit ():
         # string into digital int 
        Choice = int (Choice) -. 1 # determines whether the user selected within the range not listed if Choice in the Range (0, len (movie_list)):
             # get the user wants to upload a file path 
            path = movie_list [Choice]
             # absolute path splicing file 
            file_path = os.path.join (MOVIE_DIR, path)
             # get file size 
            file_size = os.path.getsize (file_path)
             # define a dictionary 
            res_d =
        
        {
                 ' File_name ' : ' sexy dealer online licensing .mp4 ' ,
                 ' FILE_SIZE ' : FILE_SIZE,
                 ' MSG ' : ' attention to the body, nutrition drink Express ' 
            } 
            # serialized dictionary 
            json_d = json.dumps (res_d) 
            json_bytes json_d.encode = ( ' UTF-. 8 ' ) 

            # 1. first make dictionary format header 
            header struct.pack = ( ' I ' , len (json_bytes))
             # 2. send dictionary header
            client.send (header)
             # 3. recurrent dictionary 
            client.send (json_bytes)
             # 4. retransmission data file (file open loop transmission) 
            with Open (file_path, ' RB ' ) AS F:
                 for Line in F: 
                    Client. Send (Line) 
        the else :
             Print ( ' Not in Range ' )
     the else :
         Print ( ' MUST BE A Number ' )

client

 

Four, sockserver module

Server

import socketserver
class MyServer(socketserver.BaseRequestHandler):
    def handle(self):
        while True:
            data = self.request.recv(1024)
            print(self.client_address)
            print(data.decode('utf-8'))
            self.request.send(data.upper())



if __name__ == '__main__':
    server = socketserver.ThreadingTCPServer(('127.0.0.1',8080),MyServer)  # 创建一个基于TCP的对象
    server.serve_forever ()   # start the service object

server

 

Client

import socket

client = socket.socket()
client.connect(('127.0.0.1',8080))
while True:
    client.send(b'hello')
    data = client.recv(1024)
    print(data.decode('utf-8'))

client