使用Qt的PySide2制作了一款用户登录界面，特点如下：
- 使用Qt的PySide2构建GUI界面；
- 加密方式：md5加salt方式进行两次加密，提高密码强度；
- 对登录/注册逻辑进行梳理；
- PySide2实现窗口间互相调用。
话不多说直接上代码：
#!/usr/bin/env python3.7
# -*- coding: utf-8 -*-from PySide2 import QtCore, QtGui, QtWidgets
import sys, time, os
import hashlib
import re
from mainwindow import MainWindowclass welcomWidget(QtWidgets.QMainWindow):def __init__(self):self.userFile = os.path.join(sys.path[0],"user.txt")super(welcomWidget, self).__init__()# 设定登录页面大小self.resize(800, 480)self.centralwidget = QtWidgets.QWidget(self)self.setCentralWidget(self.centralwidget)self.setWindowTitle('注册登录界面')# 添加组控件（位置大小基于centralwidget）self.groupBox = QtWidgets.QGroupBox(self.centralwidget)self.groupBox.setGeometry(QtCore.QRect(50, 25, 700, 160))self.groupBox.setTitle("用户注册/登录")self.groupBox.setStyleSheet("QGroupBox{font-family:'黑体';font-size:14px;}")# 设置用户名label（位置大小基于groupBox）self.nameLabel = QtWidgets.QLabel(self.groupBox)self.nameLabel.setGeometry(QtCore.QRect(50, 35, 130, 30))self.nameLabel.setText("用户名称：")self.nameLabel.setStyleSheet("QLabel{font-family:'黑体';font-size:24px;}")self.nameLabel.setAlignment(QtCore.Qt.AlignCenter)# 设置密码label（位置大小基于groupBox）self.pwdLabel = QtWidgets.QLabel(self.groupBox)self.pwdLabel.setGeometry(QtCore.QRect(50, 105, 130, 30))self.pwdLabel.setText("用户密码：")self.pwdLabel.setStyleSheet("QLabel{font-family:'黑体';font-size:24px;}")self.pwdLabel.setAlignment(QtCore.Qt.AlignCenter)# 设置图片区域（位置大小基于groupBox）self.picLabel = QtWidgets.QLabel(self.groupBox)self.pic=QtGui.QPixmap(os.path.join(sys.path[0],'pictures/welcome.png'))self.picLabel.setPixmap(self.pic)self.picLabel.setGeometry(QtCore.QRect(440, 22, 210, 120))# 设置用户名输入框（位置大小基于groupBox）self.userLineedit = QtWidgets.QLineEdit(self.groupBox)self.userLineedit.setGeometry(QtCore.QRect(170, 35, 200, 30))self.userLineedit.setPlaceholderText('请输入用户名')self.userLineedit.setStyleSheet("QLineEdit{font-family:'黑体';font-size:16px;}")self.userLineedit.setClearButtonEnabled(True)# 设置密码输入框（位置大小基于groupBox）self.pwdLineedit = QtWidgets.QLineEdit(self.groupBox)self.pwdLineedit.setGeometry(QtCore.QRect(170, 105, 200, 30))self.pwdLineedit.setPlaceholderText('请输入密码')self.pwdLineedit.setStyleSheet("QLineEdit{font-family:'黑体';font-size:16px;}")self.pwdLineedit.setClearButtonEnabled(True)# 设置登录按钮（位置大小基于centralwidget）self.loginButton = QtWidgets.QPushButton(self.centralwidget)self.loginButton.setGeometry(QtCore.QRect(50, 200, 200, 40))self.loginButton.setText('登录系统')self.loginButton.setShortcut('Enter')self.loginButton.setStyleSheet("QPushButton{font-family:'黑体';font-size:16px;}")# 设置注册按钮（位置大小基于centralwidget）self.registerButton = QtWidgets.QPushButton(self.centralwidget)self.registerButton.setGeometry(QtCore.QRect(300, 200, 200, 40))self.registerButton.setText('新用户注册')self.registerButton.setShortcut('Enter')self.registerButton.setStyleSheet("QPushButton{font-family:'黑体';font-size:16px;}")# 设置退出按钮（位置大小基于centralwidget）self.cancelButton = QtWidgets.QPushButton(self.centralwidget)self.cancelButton.setGeometry(QtCore.QRect(551, 200, 200, 40))self.cancelButton.setText('退出系统')self.cancelButton.setShortcut('Escape')self.cancelButton.setStyleSheet("QPushButton{font-family:'黑体';font-size:16px;}")# 以下均为设置label填写文字内容（位置大小基于centralwidget）self.contactLabel = QtWidgets.QLabel(self.centralwidget)self.contactLabel.setGeometry(QtCore.QRect(50, 250, 700, 20))self.contactLabel.setText('用户名为数字及（或）大写字母及（或）小写字母，长度须大于等于4字节。')self.contactLabel.setStyleSheet("QLabel{font-family:'黑体';font-size:16px; color:red;}")self.contactLabel.setAlignment(QtCore.Qt.AlignCenter)self.warningLabel = QtWidgets.QLabel(self.centralwidget)self.warningLabel.setGeometry(QtCore.QRect(50, 280, 700, 20))self.warningLabel.setText("密码为数字、大写字母、小写字母，且至少含大小写字母及数字各1个，长度须大于等于6字节。")self.warningLabel.setStyleSheet("QLabel{font-family:'黑体';font-size:16px; line-height:100px; color:red;}")self.warningLabel.setAlignment(QtCore.Qt.AlignCenter)self.warningLabel = QtWidgets.QLabel(self.centralwidget)self.warningLabel.setGeometry(QtCore.QRect(50, 310, 700, 20))self.warningLabel.setText("用户名密码储存于user.txt文件，使用hashlib加salt方式两次加密，强度满足需求。")self.warningLabel.setStyleSheet("QLabel{font-family:'黑体';font-size:16px; line-height:100px; color:red;}")self.warningLabel.setAlignment(QtCore.Qt.AlignCenter)# 设置LCD钟表（位置大小基于centralwidget）self.dateclockLCD=QtWidgets.QLCDNumber(self.centralwidget)self.dateclockLCD.setDigitCount(19)self.dateclockLCD.setStyleSheet("border:0px; color: black; background: rgb(240, 240, 240);")self.dateclockLCD.resize(400,150)self.dateclockLCD.setSegmentStyle(QtWidgets.QLCDNumber.Flat)self.dateclockLCD.setGeometry(QtCore.QRect(50,355,700,100))self.timeTimer = QtCore.QTimer()self.timeTimer.connect(self.timeTimer, QtCore.SIGNAL('timeout()'), self.showTime)self.timeTimer.start(1000)# 禁止窗口最大最小化self.setWindowFlags(QtCore.Qt.WindowCloseButtonHint)# 禁止拉伸窗口self.setFixedSize(self.width(), self.height()) # 密码隐藏self.pwdLineedit.setEchoMode(QtWidgets.QLineEdit.Password)# 点击取消按钮退出应用self.connect(self.cancelButton, QtCore.SIGNAL('clicked()'), self.closeWelcome)# 点击确定按钮进入主窗口self.loginButton.clicked.connect(self.login)# 点击注册按钮进行注册self.registerButton.clicked.connect(self.register)# 按规则检查用户名：4字符及以上，且仅包括数字及（或）大小写字母def username_check(self, username):if len(username)>=4:if re.match("^[A-Za-z0-9]+$", username)==None:QtWidgets.QMessageBox.information(self, u'用户名不符合要求', u'用户名仅包括数字及大小写字母，请检查后重新输入', QtWidgets.QMessageBox.Ok)return Falseelse:return True else:QtWidgets.QMessageBox.information(self, u'用户名不符合要求', u'用户名须大于4字符，请检查后重新输入', QtWidgets.QMessageBox.Ok)return False# 按规则检查密码：6字符及以上，且仅包括数字及大小写字母，至少含大小写字母及数字各1个def password_check(self,password):if len(password)>=6:if re.match("^(?:(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])).*$", password)==None:QtWidgets.QMessageBox.information(self, u'密码不符合要求', u'密码仅包括数字及大小写字母，且至少含大小写字母及数字各1个，请检查后重新输入', QtWidgets.QMessageBox.Ok)return Falseelse:return Trueelse:QtWidgets.QMessageBox.information(self, u'密码不符合要求', u'密码须大于6字符，请检查后重新输入', QtWidgets.QMessageBox.Ok)return False# 用户名密码加salt加密def encryption(self,info):# 加salt（002587字符串）md5=hashlib.md5(b'002587')md5.update(info.encode('utf-8'))return md5.hexdigest()# 检查用户名是否已存在def user_exist(self,username):try:with open(self.userFile,"r",encoding="utf-8") as f:for line in f:line = line.strip()line_new = line.split("#")if line_new[0] == username:return Truereturn Falseexcept IOError:QtWidgets.QMessageBox.warning(self, u'系统错误', u'系统错误程序即将关闭，\n请稍后重启程序或联系管理员', QtWidgets.QMessageBox.Ok)if QtWidgets.QMessageBox.Ok:self.closeWelcome()return False# 验证及登录def login(self):username=self.userLineedit.text()password=self.pwdLineedit.text()if username=='':QtWidgets.QMessageBox.information(self, u'用户名为空', u'请输入用户名', QtWidgets.QMessageBox.Ok)elif password=='':QtWidgets.QMessageBox.information(self, u'密码为空', u'请输入密码', QtWidgets.QMessageBox.Ok)else:# 用户名密码两次加密提高强度username1=self.encryption(username)username2=self.encryption(username1)username=username2password1=self.encryption(password)password2=self.encryption(password1)password=password2if self.user_exist(username):try:with open(self.userFile,"r",encoding="utf-8") as f:for line in f:line = line.strip()line_list = line.split("#")if line_list[0] == username and line_list[1] == password:self.homePage = MainWindow()self.homePage.show()self.hide()elif line_list[0] == username and line_list[1] != password:QtWidgets.QMessageBox.information(self, u'提示', u'密码或错误，请重新输入', QtWidgets.QMessageBox.Ok)if QtWidgets.QMessageBox.Ok:self.userLineedit.setText('')self.pwdLineedit.setText('')except IOError:QtWidgets.QMessageBox.warning(self, u'系统错误', u'系统错误程序即将关闭，\n请稍后重启程序或联系管理员', QtWidgets.QMessageBox.Ok)if QtWidgets.QMessageBox.Ok:self.closeWelcome()else:no_user=QtWidgets.QMessageBox.question(self, u'用户不存在', u'当前用户不存在，是否注册新用户？')if no_user==QtWidgets.QMessageBox.StandardButton.Yes:self.register()if no_user==QtWidgets.QMessageBox.StandardButton.No:self.userLineedit.setText('')self.pwdLineedit.setText('')# 验证及注册def register(self):username=self.userLineedit.text()password=self.pwdLineedit.text()if self.username_check(username) and self.password_check(password):username1=self.encryption(username)username2=self.encryption(username1)username=username2if not self.user_exist(username):password1=self.encryption(password)password2=self.encryption(password1)password=password2with open(self.userFile,"a",encoding="utf-8")as f:temp = "\n" + username + "#" + passwordf.write(temp)register_success=QtWidgets.QMessageBox.question(self, u'提示', u'注册成功，是否登录？')if register_success==QtWidgets.QMessageBox.StandardButton.Yes:self.login()if register_success==QtWidgets.QMessageBox.StandardButton.No:self.userLineedit.setText('')self.pwdLineedit.setText('')else:QtWidgets.QMessageBox.information(self, u'提示', u'用户名已存在，请重新输入', QtWidgets.QMessageBox.Ok)if QtWidgets.QMessageBox.Ok:self.userLineedit.setText('')self.pwdLineedit.setText('')else:self.userLineedit.setText('')self.pwdLineedit.setText('')# 配合LCD显示时间def showTime(self):mytime = time.strftime('%Y-%m-%d %H:%M:%S')self.dateclockLCD.display(mytime)# 关闭窗口def closeWelcome(self):self.close()if __name__ == '__main__':app = QtWidgets.QApplication(sys.argv)gui = welcomWidget()gui.show()sys.exit(app.exec_())
待完善项目：
- user.txt文件保护及定时备份；
- 多次用户名密码错误锁定/删除功能；
- 用户注销功能；
- 不同用户分区读取文件功能；
- 密码找回功能（利用注册时提供的唯一识别码）；
- 其他。
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