TCP傳輸控制協議 穩定，相對於UDP而言要慢一些，Web服務器都是使用TCP

UDP用戶數據包協議 不穩定

TCP客戶端與服務端的連接

# client.py
from socket import *
clientSocket = socket(AF_INET,SOCK_STREAM)
clientSocket.connect(("192.168.52.1",8897))

while True:
    user = input("請輸入用戶名：")
    clientSocket.sendall(user.encode())

    passwd = input("請輸入密碼：
 
")
    clientSocket.sendall(passwd.encode())
    serdata1 = clientSocket.recv(1024)
    print(str(serdata1, "utf8"))
    serdata2 = clientSocket.recv(1024)
    if (serdata2):
        while True:
            data = input("你可以進行以下操作：1.增加用戶2.刪除用戶3.修改用戶>>>")
            clientSocket.sendall(data.encode())
            
 
if data == ‘1‘:
                newuser = input ("請輸入要創建的用戶名：")
                newpasswd = input("請輸入創建用戶的密碼:")
                newstr = newuser + ‘ ‘ + newpasswd
                clientSocket.sendall(newstr.encode())
                serdata3 = clientSocket.recv(1024)
                print(str(serdata3, "
 
utf8"))
            elif data == ‘2‘:
                deluser = input("請輸入要刪除的用戶名：")
                clientSocket.sendall(deluser.encode())
                serdata4 = clientSocket.recv(1024)
                print(str(serdata4, "utf8"))
            elif data == ‘3‘:
                reuser = input("請輸入要修改的用戶名：")
                clientSocket.sendall(reuser.encode())
                repasswd = input("請輸入修改後的密碼：")
                clientSocket.sendall(repasswd.encode())
                serdata5 = clientSocket.recv(1024)
                print(str(serdata5, "utf8"))

        else:
            break
clientSocket.close()








# server.py

from socket import *
ip_port=("",8897)

serSocket = socket(AF_INET,SOCK_STREAM)
serSocket.bind(ip_port)

serSocket.listen(5)
num = open(‘data.txt‘,‘a+‘,encoding = ‘utf-8‘)
num.seek(0)
fileWords = num.read().split()
while True:
    newSocket,address = serSocket.accept()
    while True:
        recvData1 = newSocket.recv(1024).decode()
        if fileWords[0] == recvData1:
            recvData2 = newSocket.recv(1024).decode()
            if fileWords[1] == recvData2:
                server_response = ("登陸成功\n")
                newSocket.sendall(bytes(server_response, "utf8"))
                i = 1
            else:
                server_response = ("密碼錯誤")
                newSocket.sendall(bytes(server_response, "utf8"))
                i = 0
        else:
            recvData2 = newSocket.recv(1024).decode()
            server_response = ("用戶名錯誤")
            newSocket.sendall(bytes(server_response, "utf8"))
            i =0
        if(i):
            serve = ("True")
            newSocket.sendall(bytes(serve, "utf8"))
            Data = newSocket.recv(1024).decode()
            if Data == ‘1‘:
                newline = newSocket.recv(1024).decode()
                num.write(‘\n‘ + newline)
                num.close()
                print(str(num))
                resop = ("創建成功")
                newSocket.sendall(bytes(resop,"utf8"))
            elif Data == ‘2‘:
                deluser = newSocket.recv(1024).decode()
                a = (fileWords.index(deluser))
                del fileWords[a]
                del fileWords[a]
                print(fileWords)
                file = open(‘data.txt‘, ‘w‘)
                for i in fileWords:
                    file.write(i)
                    file.write(" ")
                file.close()
                resop = ("刪除成功")
                newSocket.sendall(bytes(resop, "utf8"))
            elif Data == ‘3‘:
                reviseuser = newSocket.recv(1024).decode()
                a = (fileWords.index(reviseuser))
                repasswd = newSocket.recv(1024).decode()
                fileWords[a+1] = repasswd
                print(fileWords)
                file = open(‘data.txt‘, ‘w‘)
                for i in fileWords:
                    file.write(i)
                    file.write(" ")
                file.close()
                resop = ("修改成功")
                newSocket.sendall(bytes(resop, "utf8"))

    newSocket.close()
serSocket.close()

服務端客戶端連接以及登陸用戶的增刪改