题目描述：
(1)模拟登陆界面，判别用户名和密码，给出合适的提示，如果超过三次，锁定输入。用代替密码；或者最新输入显示，前面的变成；安全性措施。
(2)同时添加如下图的加强验证（京东）。
(3)在触动滚动条时再出现空缺位置。
拓展：
- 增加注册页面，可供用户注册新用户
- 增加数字验证码区别人机
解题思路/算法分析/问题及解决
滑块验证就是将滑块的移动和图片小块的移动相绑定，在滑块松开时触发相对应的检查函数，为了有一定的容错率，设定滑块的位置与设定的位置相差3个像素以内即算验证成功。
- 每次的位置随机生成，同时随即从14张事先准备好的图片中选取一张作为背景图。
- 图片小块和背景图片分别放在两个不同的QLabel容器中。
- 每次刷新时将背景图片的相应位置抠出放于图片小块中，并将背景图片的相应部分置为白色以示区别。
- 拓展：
- 新增注册页部分就是点击按钮弹出注册页的对话框，可在里面输入新用户信息并保存到用户信息字典中，随后可用新注册的用户登录。
- 数字验证码由4位数字0-9和字母a-z及A-Z组成，随机在可行字符集中选取4个字符组成四位验证码，然后自动生成验证码以图片的方式呈现给用户。
实验代码
登录主界面：
登录验证：
def check_login_func(self):
if not self.validate_line.text():
QMessageBox.warning(self, "警告", "还未输入验证码")
return
validate_slide = Validate_page()
r = validate_slide.exec_()
if not r:
return
if self.validate.upper() == self.validate_line.text().upper():
if USER_PWD.get(self.user_line.text()) == self.pwd_line.text():
QMessageBox.information(self, 'Information', 'Log in Successfully!')
self.nums = 0
self.refresh()
# self.close()
# self.STU.exec()
else:
QMessageBox.critical(self, 'Wrong', 'Wrong Username or Password!')
self.nums = self.nums + 1
if self.nums == 3:
QMessageBox.critical(self, "wrong", "密码输错次数已达三次！")
self.close()
self.user_line.clear()
self.pwd_line.clear()
self.validate_line.clear()
else:
QMessageBox.critical(self, "wrong", "验证码输入有误！")
self.refresh()
self.validate_line.clear()
自动生成验证码图片：
def get_chars():
"""生成给定长度的字符串，返回列表格式"""
return random.sample(chars, length)
def create_lines():
"""绘制干扰线"""
line_num = random.randint(*n_line) # 干扰线条数
for i in range(line_num):
# 起始点
begin = (random.randint(0, size[0]), random.randint(0, size[1]))
# 结束点
end = (random.randint(0, size[0]), random.randint(0, size[1]))
draw.line([begin, end], fill=(0, 0, 0))
def create_points():
"""绘制干扰点"""
chance = min(100, max(0, int(point_chance))) # 大小限制在[0, 100]
for w in range(width):
for h in range(height):
tmp = random.randint(0, 100)
if tmp > 100 - chance:
draw.point((w, h), fill=(0, 0, 0))
def create_strs():
"""绘制验证码字符"""
c_chars = get_chars()
strs = ' %s ' % ' '.join(c_chars) # 每个字符前后以空格隔开
font = ImageFont.truetype(font_type, font_size)
font_width, font_height = font.getsize(strs)
draw.text(((width - font_width) / 3, (height - font_height) / 3),
strs, font=font, fill=fg_color)
return ''.join(c_chars)
if draw_lines:
create_lines()
if draw_points:
create_points()
strs = create_strs()
# 图形扭曲参数
params = [1 - float(random.randint(1, 2)) / 100,
0,
0,
0,
1 - float(random.randint(1, 10)) / 100,
float(random.randint(1, 2)) / 500,
0.001,
float(random.randint(1, 2)) / 500
]
img = img.transform(size, Image.PERSPECTIVE, params) # 创建扭曲
img = img.filter(ImageFilter.EDGE_ENHANCE_MORE) # 滤镜，边界加强（阈值更大）
mstream = io.BytesIO()
img.save(mstream, img_type)
if save_img:
img.save("validate.jpg", img_type)
return mstream, strs
注册界面部分：
页面初始化：
def __init__(self):
super(SigninPage, self).__init__()
self.signin_user_label = QLabel('Username:', self)
self.signin_pwd_label = QLabel('Password:', self)
self.signin_pwd2_label = QLabel('Password:', self)
self.signin_user_line = QLineEdit(self)
self.signin_pwd_line = QLineEdit(self)
self.signin_pwd2_line = QLineEdit(self)
self.signin_button = QPushButton('Sign in', self)
self.user_h_layout = QHBoxLayout()
self.pwd_h_layout = QHBoxLayout()
self.pwd2_h_layout = QHBoxLayout()
self.all_v_layout = QVBoxLayout()
self.lineedit_init()
self.pushbutton_init()
self.layout_init()
def layout_init(self):
self.user_h_layout.addWidget(self.signin_user_label)
self.user_h_layout.addWidget(self.signin_user_line)
self.pwd_h_layout.addWidget(self.signin_pwd_label)
self.pwd_h_layout.addWidget(self.signin_pwd_line)
self.pwd2_h_layout.addWidget(self.signin_pwd2_label)
self.pwd2_h_layout.addWidget(self.signin_pwd2_line)
self.all_v_layout.addLayout(self.user_h_layout)
self.all_v_layout.addLayout(self.pwd_h_layout)
self.all_v_layout.addLayout(self.pwd2_h_layout)
self.all_v_layout.addWidget(self.signin_button)
self.setLayout(self.all_v_layout)
def lineedit_init(self):
self.signin_user_line.setPlaceholderText("username")
self.signin_pwd_line.setPlaceholderText("password")
self.signin_pwd2_line.setPlaceholderText("password again")
self.signin_pwd_line.setEchoMode(QLineEdit.Password)
self.signin_pwd2_line.setEchoMode(QLineEdit.Password)
self.signin_user_line.textChanged.connect(self.check_input_func)
self.signin_pwd_line.textChanged.connect(self.check_input_func)
self.signin_pwd2_line.textChanged.connect(self.check_input_func)
注册检验部分：
def check_signin_func(self):
if self.signin_pwd_line.text() != self.signin_pwd2_line.text():
QMessageBox.critical(self, 'Wrong', 'Two Passwords Typed Are Not Same!')
elif self.signin_user_line.text() not in USER_PWD:
USER_PWD[self.signin_user_line.text()] = self.signin_pwd_line.text()
QMessageBox.information(self, 'Information', 'Register Successfully')
self.close()
else:
QMessageBox.critical(self, 'Wrong', 'This Username Has Been Registered!')
self.signin_user_line.clear()
self.signin_pwd_line.clear()
self.signin_pwd2_line.clear()
滑块验证部分：
class Validate_page(QDialog):
def __init__(self):
super(Validate_page, self).__init__()
self.resize(600, 500)
self.setWindowTitle("拖动滑块验证")
self.initUI()
self.Widget_init()
self.refresh()
# self.show()
def initUI(self):
# 初始化相关控件位置
self.lb_bg = QLabel(self)
self.lb_sl = QLabel(self)
self.lb_bg.setStyleSheet("border: 2px solid red")
# self.lb_sl.setStyleSheet("border: 2px solid blue")
self.lb_bg.setGeometry(100, 100, 400, 200)
self.lb_wz = QLabel(self)
# self.lb_wz.setStyleSheet("border: 2px solid green")
self.refresh()
self.button = QPushButton("取消", self)
self.button.setGeometry(400, 430, 100, 50)
self.slider = QSlider(Qt.Horizontal, self)
self.slider.setGeometry(100, 350, 400, 50)
def Widget_init(self):
# 初始化相关组件的信号连接
self.slider.setMinimum(0)
self.slider.setMaximum(360)
self.slider.valueChanged.connect(self.slide)
self.slider.sliderReleased.connect(self.check)
self.button.clicked.connect(self.cancel)
def slide(self, value):
self.lb_sl.move(100 + value, self.answer_y) # 将滑块与图片小块绑定
# print(value)
def refresh(self):
import random
# 随机生成验证区域
self.answer_x = random.randint(100, 460)
self.answer_y = random.randint(100, 260)
pic = random.randint(0, 14)
self.lb_sl.setGeometry(100, self.answer_y, 40, 40)
self.lb_wz.setGeometry(self.answer_x, self.answer_y, 40, 40)
img = cv2.imread(f"pic/{pic}.jpeg") # 读取背景图片
img = cv2.resize(img, (400, 200))
x = self.answer_x - 100
y = self.answer_y - 100
img1 = copy.copy(img[y:y + 40, x:x + 40]) # 扣40*40的图片小块
img[y:y + 40, x:x + 40] = 255 # 将被扣区域置为白色
img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
img1 = cv2.cvtColor(img1, cv2.COLOR_BGR2RGB)
qt_img = QImage(img.data, 400, 200, QImage.Format_RGB888)
qt_img1 = QImage(img1.data, 40, 40, QImage.Format_RGB888)
self.lb_bg.setPixmap(QPixmap.fromImage(qt_img))
self.lb_sl.setPixmap(QPixmap.fromImage(qt_img1))
def check(self): # 检验滑动验证是否成功
# 获取设定区域坐标
x = self.lb_sl.pos().x()
y = self.lb_sl.pos().y()
print(f"({x},{y})")
if abs(x - self.answer_x) <= 3: # 容错为3px
QMessageBox.information(self, "恭喜", "验证成功")
self.done(1)
else:
QMessageBox.critical(self, "错误", "验证失败")
self.slider.setValue(0)
self.refresh()
def cancel(self):
self.done(0) # 点击取消滑动验证
运行结果
全部背景图片：
注册界面：
完整代码
到此这篇关于python 密码验证(滑块验证)的文章就介绍到这了,更多相关python 密码验证(滑块验证)内容请搜索编程网以前的文章或继续浏览下面的相关文章希望大家以后多多支持编程网！
