代码功能：
可实现应用程序用户管理，实现用户登录、注册、密码修改
代码文档结构：
- user_database.db：数据库文件，用于存储用户数据，第一运行代码时自动生成
- login.ui：UI文件，由QT设计
- ui_login.py（由login.ui编译过来）
- 在终端Windows PowerShell运行如下代码即可生成
bash
pyside6-uic login.ui -o ui_login.py- test_login.py（如下代码：）
python
from PySide6.QtWidgets import QApplication, QWidget, QLineEdit, QPushButton, QVBoxLayout, QHBoxLayout, QLabel, \
QMessageBox, QDialog
from PySide6.QtCore import Qt, QSize, QFile
from PySide6.QtGui import QPixmap, QPalette, QBrush, QShortcut, QKeySequence
import sqlite3
from src.ui.ui_login import Ui_login_widget
def create_user_table():
conn = sqlite3.connect('user_database.db')
cursor = conn.cursor()
cursor.execute("""
CREATE TABLE IF NOT EXISTS user (
id INTEGER PRIMARY KEY AUTOINCREMENT,
username TEXT NOT NULL UNIQUE,
password TEXT NOT NULL
);
""")
conn.commit()
conn.close()
create_user_table()
class LoginWidget(QWidget, Ui_login_widget):
def __init__(self):
super().__init__()
self.setupUi(self) # Ui_login_widget中的方法，用于设置UI
# 设置窗口标志：隐藏最小化和最大化
self.setWindowFlags(Qt.Window | Qt.WindowCloseButtonHint)
self.setWindowTitle("登录")
# 连接信号和槽
self.btn_login.clicked.connect(self.login)
self.btn_quit.clicked.connect(self.quit)
# 设置快捷键
self.shortcut_register = QShortcut(QKeySequence("Ctrl+Alt+R"), self)
self.shortcut_register.activated.connect(self.register)
self.shortcut_changePassword = QShortcut(QKeySequence("Ctrl+Alt+P"), self)
self.shortcut_changePassword.activated.connect(self.changePassword)
# 设置登录窗体背景颜色和字体
self.set_default_styleSheet()
# 设置登录窗体背景图片
# self.set_background()
def set_background(self):
# 加载背景图片
pixmap = QPixmap("resources/images/images/login_example.jpg")
# 调整图片尺寸以适应窗体大小
scaled_pixmap = pixmap.scaled(self.size(), Qt.KeepAspectRatioByExpanding)
palette = QPalette()
palette.setBrush(QPalette.Window, QBrush(scaled_pixmap))
self.setPalette(palette)
def set_default_styleSheet(self):
# 设置登录窗体背景颜色和字体
self.setStyleSheet("""
background-color: rgb(40, 44, 52);
color: rgb(255, 255, 255);
""")
# 设置登录窗体默认logo，如需更换需要重新编译resources/resources.qrc文件
self.lb_app_logo.setStyleSheet("""
background-image: url(:/images/images/images/login_example.png);
background-position: center;
background-repeat: no-repeat;
""")
def login(self):
username = self.cBox_username.currentText()
password = self.le_password.text()
if len(password) == 0:
QMessageBox.warning(self, "登录失败", "用户名和密码不能为空！")
return
conn = sqlite3.connect('user_database.db')
cursor = conn.cursor()
cursor.execute("SELECT password FROM user WHERE username = ?", (username,))
result = cursor.fetchone()
if result and result[0] == password:
QMessageBox.information(self, "登录成功", "您已成功登录！")
else:
QMessageBox.warning(self, "登录失败", "密码错误！")
conn.close()
def register(self):
self.register_widget = RegisterWidget()
self.register_widget.show()
def changePassword(self):
username = '普通用户'
self.change_password_widget = ChangePasswordWidget(username)
self.change_password_widget.show()
def quit(self):
self.close()
class RegisterWidget(QDialog):
def __init__(self):
super().__init__()
self.setWindowTitle("注册")
# 设置窗口标志：隐藏最小化和最大化
self.setWindowFlags(Qt.Window | Qt.WindowCloseButtonHint)
# 设置窗体为模态
self.setModal(True)
self.setup_ui()
def setup_ui(self):
self.layout = QVBoxLayout(self)
self.username = QLineEdit(self)
self.username.setPlaceholderText("用户名")
self.layout.addWidget(self.username)
self.password = QLineEdit(self)
self.password.setPlaceholderText("密码")
self.layout.addWidget(self.password)
self.register_button = QPushButton("注册", self)
self.register_button.clicked.connect(self.register)
self.layout.addWidget(self.register_button)
def register(self):
username = self.username.text()
password = self.password.text()
if not username or not password:
QMessageBox.warning(self, "注册失败", "用户名和密码不能为空！")
return
try:
conn = sqlite3.connect('user_database.db')
cursor = conn.cursor()
cursor.execute("INSERT INTO user (username, password) VALUES (?, ?)", (username, password))
conn.commit()
QMessageBox.information(self, "注册成功", "您已成功注册！请返回登录。")
self.close()
except sqlite3.IntegrityError:
QMessageBox.warning(self, "注册失败", "用户名已存在！")
finally:
conn.close()
class ChangePasswordWidget(QDialog):
def __init__(self, username):
super().__init__()
self.username = username # 用户名应该在实例化时提供
self.setWindowTitle("修改密码")
# 设置窗口标志：隐藏最小化和最大化
self.setWindowFlags(Qt.Window | Qt.WindowCloseButtonHint)
# 设置窗体为模态
self.setModal(True)
self.setup_ui()
def setup_ui(self):
self.layout = QVBoxLayout(self)
# 旧密码输入框
self.old_password = QLineEdit(self)
self.old_password.setPlaceholderText("旧密码")
self.old_password.setEchoMode(QLineEdit.Password)
self.layout.addWidget(self.old_password)
# 新密码输入框
self.new_password = QLineEdit(self)
self.new_password.setPlaceholderText("新密码")
self.new_password.setEchoMode(QLineEdit.Password)
self.layout.addWidget(self.new_password)
# 确认新密码输入框
self.confirm_new_password = QLineEdit(self)
self.confirm_new_password.setPlaceholderText("确认新密码")
self.confirm_new_password.setEchoMode(QLineEdit.Password)
self.layout.addWidget(self.confirm_new_password)
# 修改密码按钮
self.change_password_button = QPushButton("修改密码", self)
self.change_password_button.clicked.connect(self.change_password)
self.layout.addWidget(self.change_password_button)
def change_password(self):
old_password = self.old_password.text()
new_password = self.new_password.text()
confirm_new_password = self.confirm_new_password.text()
if new_password != confirm_new_password:
QMessageBox.warning(self, "修改失败", "新密码和确认密码不匹配！")
return
conn = sqlite3.connect('user_database.db')
cursor = conn.cursor()
# 验证旧密码
cursor.execute("SELECT password FROM user WHERE username = ?", (self.username,))
result = cursor.fetchone()
if not result or result[0] != old_password:
QMessageBox.warning(self, "修改失败", "旧密码错误！")
conn.close()
return
# 更新数据库中的密码
cursor.execute("UPDATE user SET password = ? WHERE username = ?", (new_password, self.username))
conn.commit()
QMessageBox.information(self, "修改成功", "密码修改成功！")
conn.close()
self.close()
if __name__ == "__main__":
app = QApplication([])
login_widget = LoginWidget()
login_widget.show()
app.exec()