VMware虚拟机基于Python3实现简单的通信

# a simple udp app
from socket import *
serverPort = 12000
serverSocket = socket(AF_INET, SOCK_DGRAM)
serverSocket.bind(('192.168.88.88', serverPort))  # ('192.168.88.88', serverPort) is a tuple

print('The server is ready to receive: ')
i = 1

while True:
    message, clientAddress = serverSocket.recvfrom(2048)

    while i > 0:
        print(clientAddress)
        print("The data type of clientAddress is :", type(clientAddress))
        i -= 1

    print(message)
    # python对bytes类型的数据用带b前缀的单引号或双引号表示：
    print(type(message))  # <class 'bytes'>
    print(message.decode())

    modifiedMessage = message.decode().upper()
    # print(modifiedMessage)

    serverSocket.sendto(modifiedMessage.encode(), clientAddress)
    # The server must attach a destination address to the packet before dropping it into the socket.

from socket import *
# serverName = "hostname"

serverName = "192.168.30.130"
serverPort = 12000
clientSocket = socket(AF_INET, SOCK_DGRAM)

while True:
    message = input("Input lowercase sentence:")
    clientSocket.sendto(message.encode(), (serverName, serverPort))
    modifiedMessage, serverAddress = clientSocket.recvfrom(2048)

# With the above line, when a packet arrives from the Internet at the client’s socket, the packet’s data is
# put into the variable modifiedMessage and the packet’s source address is put into the variable serverAddress.
# The program UDPClient doesn't actually need this server address information,
# since it already knows the server address from the outset;
# but this line of Python provides the server address nevertheless.
# The method recvfrom also takes the buffer size 2048 as input.

    print("Data from the UDP server:", modifiedMessage.decode())


clientSocket.close()

[root@localhost PyCode]# systemctl stop firewalld

[shun@localhost ~]$ su root
密码：
[root@localhost shun]# cd /home
[root@localhost home]# mkdir PyCode
[root@localhost home]# cd /mnt/hgfs/Share/
[root@localhost Share]# ls
curve01.py  TCPClient.py  TCPServer.py  UDPClient.py  UDPServer.py
[root@localhost Share]# cp -f UDPServer.py /home/PyCode/
[root@localhost Share]# cd /home/PyCode/
[root@localhost PyCode]# ls
UDPServer.py

[shun@localhost ~]$ ip addr

[root@localhost PyCode]# vim UDPServer.py 

[root@localhost PyCode]# python3 -V
Python 3.9.8
[root@localhost PyCode]# python3 UDPServer.py 
The server is ready to receive: 

[shun@localhost ~]$ su root
密码：
[root@localhost shun]# cd /home
[root@localhost home]# mkdir PyCode
[root@localhost home]# cd PyCode/
[root@localhost PyCode]# cd /mnt/hgfs/Share/
[root@localhost Share]# ls
curve01.py  TCPClient.py  TCPServer.py  UDPClient.py  UDPServer.py
[root@localhost Share]# cp -f UDPClient.py /home/PyCode/
[root@localhost Share]# cd /home/PyCode/
[root@localhost PyCode]# ls
UDPClient.py

[root@localhost PyCode]# vim UDPClient.py 

[root@localhost PyCode]# python3 -V
Python 3.9.8
[root@localhost PyCode]# python3 UDPClient.py 
Input lowercase sentence:i love china
Data from the UDP server: I LOVE CHINA