tcp udp实践

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前言

真的来写一个tcp udp试试

环境

  • python3.10[client]
  • Ubuntu-22.04（wsl）[client]

UDP样例

实现了一个发送字符串，接收大写字符串的udp客户端与服务端

客户端

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from socket import *
serverName = '127.0.0.1'#目标host
serverPort = 12000
clientSocket = socket(AF_INET, SOCK_DGRAM)#第一个参数为使用ipv4 第二个说明为udp
while True:
    message = input('Input lowercase sentence:')
    clientSocket.sendto(message.encode(),(serverName,serverPort))
    modifiedMessage, serverAddress = clientSocket.recvfrom(2048)
    print (modifiedMessage.decode())#从python3开始 socket传输需要bytes类型

服务端

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from socket import *
serverPort = 12000
serverSocket = socket(AF_INET,SOCK_DGRAM)
serverSocket.bind(('',serverPort))
print("The server is ready to receive")
while True:
    message, clientAddress = serverSocket.recvfrom(2048)
    print(message,clientAddress)
    modifiedMessage = message.upper()
    serverSocket.sendto(modifiedMessage, clientAddress)

TCP样例

tcp要求在传输数据前有三次握手，在python中体现为使用一个socket来进行握手，然后创建另一个socket继续传输

客户端

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from socket import *
serverName = '127.0.0.1'
serverPort = 12000

while True:
    sentence = input("input lowercase sentence:")
    clientSocket = socket(AF_INET,SOCK_STREAM) #还不理解close后会不会彻底删除那个对象，这里重新创建一遍
    clientSocket.connect((serverName,serverPort))#与udp对比，这里出现了一次connect()
    clientSocket.send(sentence.encode())
    modifiedSentence = clientSocket.recv(1024)
    print("From server",modifiedSentence.decode())
    clientSocket.close()

服务端

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from socket import *
serverPort = 12000
serverSocket = socket(AF_INET,SOCK_STREAM)
serverSocket.bind(('',serverPort))
serverSocket.listen(1)#请求的最大连接数
print('The server is ready')
while True:
    connectionSocket, addr = serverSocket.accept()#多出来个serversocket处理connect()带来的握手
    print("connected with",addr)
    sentence = connectionSocket.recv(1024)
    modifiedSentence = sentence.upper()
    connectionSocket.send(modifiedSentence)
    connectionSocket.close()

套接字编程作业

Web服务器

udp ping

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