【python】-- 基于Django的杂货铺
Django的杂货铺
此篇文章保存基于Django而实现的各种小功能示例
1、验证码 + Session
这个是在前端图片验证码的生成,再配合Session进行后端校验的功能示例
1 import random 2 from PIL import Image, ImageDraw, ImageFont, ImageFilter 3 4 _letter_cases = "abcdefghjkmnpqrstuvwxy" # 小写字母,去除可能干扰的i,l,o,z 5 _upper_cases = _letter_cases.upper() # 大写字母 6 _numbers = ''.join(map(str, range(3, 10))) # 数字 7 init_chars = ''.join((_letter_cases, _upper_cases, _numbers)) 8 9 10 def create_validate_code(size=(120, 30), 11 chars=init_chars, 12 img_type="GIF", 13 mode="RGB", 14 bg_color=(255, 255, 255), 15 fg_color=(0, 0, 255), 16 font_size=18, 17 font_type="Monaco.ttf", 18 length=4, 19 draw_lines=True, 20 n_line=(1, 2), 21 draw_points=True, 22 point_chance=2): 23 """ 24 @todo: 生成验证码图片 25 @param size: 图片的大小,格式(宽,高),默认为(120, 30) 26 @param chars: 允许的字符集合,格式字符串 27 @param img_type: 图片保存的格式,默认为GIF,可选的为GIF,JPEG,TIFF,PNG 28 @param mode: 图片模式,默认为RGB 29 @param bg_color: 背景颜色,默认为白色 30 @param fg_color: 前景色,验证码字符颜色,默认为蓝色#0000FF 31 @param font_size: 验证码字体大小 32 @param font_type: 验证码字体,默认为 ae_AlArabiya.ttf 33 @param length: 验证码字符个数 34 @param draw_lines: 是否划干扰线 35 @param n_lines: 干扰线的条数范围,格式元组,默认为(1, 2),只有draw_lines为True时有效 36 @param draw_points: 是否画干扰点 37 @param point_chance: 干扰点出现的概率,大小范围[0, 100] 38 @return: [0]: PIL Image实例 39 @return: [1]: 验证码图片中的字符串 40 """ 41 42 width, height = size # 宽高 43 # 创建图形 44 img = Image.new(mode, size, bg_color) 45 draw = ImageDraw.Draw(img) # 创建画笔 46 47 def get_chars(): 48 """生成给定长度的字符串,返回列表格式""" 49 return random.sample(chars, length) 50 51 def create_lines(): 52 """绘制干扰线""" 53 line_num = random.randint(*n_line) # 干扰线条数 54 55 for i in range(line_num): 56 # 起始点 57 begin = (random.randint(0, size[0]), random.randint(0, size[1])) 58 # 结束点 59 end = (random.randint(0, size[0]), random.randint(0, size[1])) 60 draw.line([begin, end], fill=(0, 0, 0)) 61 62 def create_points(): 63 """绘制干扰点""" 64 chance = min(100, max(0, int(point_chance))) # 大小限制在[0, 100] 65 66 for w in range(width): 67 for h in range(height): 68 tmp = random.randint(0, 100) 69 if tmp > 100 - chance: 70 draw.point((w, h), fill=(0, 0, 0)) 71 72 def create_strs(): 73 """绘制验证码字符""" 74 c_chars = get_chars() 75 strs = ' %s ' % ' '.join(c_chars) # 每个字符前后以空格隔开 76 77 font = ImageFont.truetype(font_type, font_size) 78 font_width, font_height = font.getsize(strs) 79 80 draw.text(((width - font_width) / 3, (height - font_height) / 3), 81 strs, font=font, fill=fg_color) 82 83 return ''.join(c_chars) 84 85 if draw_lines: 86 create_lines() 87 if draw_points: 88 create_points() 89 strs = create_strs() 90 91 # 图形扭曲参数 92 params = [1 - float(random.randint(1, 2)) / 100, 93 0, 94 0, 95 0, 96 1 - float(random.randint(1, 10)) / 100, 97 float(random.randint(1, 2)) / 500, 98 0.001, 99 float(random.randint(1, 2)) / 500 100 ] 101 img = img.transform(size, Image.PERSPECTIVE, params) # 创建扭曲 102 103 img = img.filter(ImageFilter.EDGE_ENHANCE_MORE) # 滤镜,边界加强(阈值更大) 104 105 return img, strs
1 from utils.check_code import create_validate_code 2 3 4 def check_code(request): 5 """ 6 验证码 7 :param request: 8 :return: 9 """ 10 stream = BytesIO() 11 img, code = create_validate_code() 12 img.save(stream, 'PNG') 13 request.session['CheckCode'] = code 14 return HttpResponse(stream.getvalue()) 15 16 17 def login(request): 18 """ 19 登陆 20 :param request: 21 :return: 22 """ 23 if request.method == "POST": 24 if request.session['CheckCode'].upper() == request.POST.get('check_code').upper(): 25 pass 26 else: 27 print('验证码错误') 28 29 30 return render(request, 'login.html')
1 <!DOCTYPE html> 2 <html> 3 <head lang="en"> 4 <meta charset="UTF-8"> 5 <title></title> 6 <link rel="stylesheet" href="/static/plugins/bootstrap/css/bootstrap.css"/> 7 <link rel="stylesheet" href="/static/plugins/font-awesome/css/font-awesome.css"/> 8 <link rel="stylesheet" href="/static/css/edmure.css"/> 9 <link rel="stylesheet" href="/static/css/commons.css"/> 10 <link rel="stylesheet" href="/static/css/account.css"/> 11 <style> 12 13 </style> 14 </head> 15 <body> 16 <div class="login"> 17 <div style="font-size: 25px; font-weight: bold;text-align: center;"> 18 用户登陆 19 </div> 20 <form role="form"> 21 <div class="form-group"> 22 <label for="username">用户名</label> 23 <input type="text" class="form-control" id="username" name="username" placeholder="请输入用户名"> 24 </div> 25 <div class="form-group"> 26 <label for="password">密码</label> 27 <input type="password" class="form-control" id="password" name="password" placeholder="请输入密码"> 28 </div> 29 <div class="form-group"> 30 <label for="password">验证码</label> 31 32 <div class="row"> 33 <div class="col-xs-7"> 34 <input type="text" class="form-control" id="check_code" name="code" placeholder="请输入验证码" > 35 </div> 36 <div class="col-xs-5"> 37 <img id="imgcode" src="/check_code.html" onclick="changeCode(this);"> 38 </div> 39 </div> 40 41 </div> 42 <div class="checkbox"> 43 <label> 44 <input type="checkbox"> 一个月内自动登陆 45 </label> 46 <div class="right"> 47 <a href="#">忘记密码?</a> 48 </div> 49 </div> 50 <button type="submit" class="btn btn-default">登 陆</button> 51 </form> 52 </div> 53 <script> 54 function changeCode(ths){ //ths是传递自己 55 //给img更换新的地址,这里的ths.src=ths.src后面是新的url地址, 56 // 但是这样页面不刷新(浏览器对相同的URL不做刷新,在后面加?来更改。原来的?是跟传递参数的,所以这样写没有问题 57 ths.src=ths.src+"?" 58 } 59 </script> 60 </body> 61 </html>
2、持续更新......