Django后端返回验证码图片
views.py
html
点击图片刷新验证码
url
check_code.py代码
import random from PIL import Image, ImageDraw, ImageFont, ImageFilter _letter_cases = "abcdefghjkmnpqrstuvwxy" # 小写字母,去除可能干扰的i,l,o,z _upper_cases = _letter_cases.upper() # 大写字母 _numbers = ''.join(map(str, range(3, 10))) # 数字 init_chars = ''.join((_letter_cases, _upper_cases, _numbers)) def create_validate_code(size=(120, 30), chars=init_chars, img_type="GIF", mode="RGB", bg_color=(255, 255, 255), fg_color=(0, 0, 255), font_size=18, font_type="Monaco.ttf", length=4, draw_lines=True, n_line=(1, 2), draw_points=True, point_chance=2): """ @todo: 生成验证码图片 @param size: 图片的大小,格式(宽,高),默认为(120, 30) @param chars: 允许的字符集合,格式字符串 @param img_type: 图片保存的格式,默认为GIF,可选的为GIF,JPEG,TIFF,PNG @param mode: 图片模式,默认为RGB @param bg_color: 背景颜色,默认为白色 @param fg_color: 前景色,验证码字符颜色,默认为蓝色#0000FF @param font_size: 验证码字体大小 @param font_type: 验证码字体,默认为 ae_AlArabiya.ttf @param length: 验证码字符个数 @param draw_lines: 是否划干扰线 @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 @param draw_points: 是否画干扰点 @param point_chance: 干扰点出现的概率,大小范围[0, 100] @return: [0]: PIL Image实例 @return: [1]: 验证码图片中的字符串 """ width, height = size # 宽高 # 创建图形 img = Image.new(mode, size, bg_color) draw = ImageDraw.Draw(img) # 创建画笔 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) return img, strsviews.py 代码
from io import BytesIO from utils.check_code import create_validate_code def tu(request): f = BytesIO() img, code = create_validate_code() img.save(f,'PNG') request.session['CheckCode'] = code return HttpResponse(f.getvalue()) def yan(request): if request.method == 'POST': print(request.POST.get('verification')) print(request.session['CheckCode']) return HttpResponse('正确') return render(request,'yan.html')
字体文件:
https://pan.baidu.com/s/195gwul3ZyblbGrEBQ4QTyw
补充:
提交验证码为字符串 所以可以使用python的字符串大小写转换来实现 不区分大小写功能
str.lower():将str中的大写字母转小写字母
str.upper():将str中的小写字母转成大写字母
实例:
from io import BytesIO from utils.check_code import create_validate_code # 验证码图片 def tu(request): f = BytesIO() img, code = create_validate_code() img.save(f,'PNG') request.session['CheckCode'] = code return HttpResponse(f.getvalue()) # 注册并验证 from web.form01 import F1from import json import re def register(request): if request.method == 'GET': obj = F1from() return render(request,'register.html',{'obj':obj}) obj = F1from(request.POST) if obj.is_valid(): # print('1111111111') ver = request.POST.get('verification') che = request.session['CheckCode'] che = che.lower() if ver == che: img = request.FILES.get('img') f = open('static/user_img/'+img.name,'wb') for line in img.chunks(): f.write(line) f.close() models.User.objects.create(**obj.cleaned_data,img='static/user_img/'+img.name) return primary(request) else: obj.a = '验证码错误' return render(request,'register.html',{"obj":obj}) return render(request,'register.html',{"obj":obj})