python-图片流传输的思路及示例(url转换二维码)
1.静态文件路径访问返回URL_name,（a标签，src 静态路由访问）
2.流传输，前端渲染二进制流返回前端，前端根据二进制流编码类型显示
3.前端js生成后台获取到微信支付的code_url,前端js将code_url生成二维码，并渲染
实际代码使用python_web 框架--》tornadomanager.py
import osimport asyncioimport tornado.ioloopimport tornado.httpserverimport tornado.webimport tornado.optionsfrom tornado.options import define, options, parse_command_linefrom apps import UrlHandler, Url2Handler, Url3Handlerdefine('port', default=8000, type=int)def create_app(): settings = { 'template_path': os.path.join(os.path.dirname(__file__), 'templates'), 'static_path': os.path.join(os.path.dirname(__file__), 'static'), } application = tornado.web.Application( handlers=[ (r'/url', UrlHandler), (r'/url2', Url2Handler), (r'/url3', Url3Handler), ], debug=True, **settings, ) return applicationif __name__ == ’__main__’: parse_command_line() app = create_app() server = tornado.httpserver.HTTPServer(app) server.listen(options.port) asyncio.get_event_loop().run_forever()
apps.py
import tornado.webfrom manager_handler import gen_qrcode, gen_qrcode_obj,gen_qrcode_bufclass BaseHandler(tornado.web.RequestHandler): passclass UrlHandler(BaseHandler): def get(self): # 获取链接 self.render(’qrcode.html’, title=’url’, data=’URL-提交’, img_stream=’’) async def post(self): # 生成二维码 url = self.get_argument(’url_str’) # URL转换二维码 img_stream = gen_qrcode(url) await self.render(’qrcode.html’, title=’qrcode’, data=’扫码支付’, img_stream=img_stream)class Url2Handler(BaseHandler): def get(self): # 获取链接 self.render(’qrcode.html’, title=’url’, data=’URL-提交’, img_stream=’’) async def post(self): # 生成二维码 url = self.get_argument(’url_str’) # URL转换二维码 img_stream = gen_qrcode_obj(url=url) # await self.render(’qrcode.html’, title=’qrcode’, data=’扫码支付’, img_stream=img_stream) self.set_header(’Content_Type’, ’image/jpg’) self.set_header(’Content_length’, len(img_stream)) self.write(img_stream)class Url3Handler(BaseHandelr): def get(self): self.render(’qrcode.html’, title=’url’, data=’URL-提交’, img_stream=’’) def post(self): url = self.get_argument(’url’) img_stream = gen_qrcode_buf(url) self.set_header(’Content-Type’, ’image/png’) self.write(img_stream)
manager_handler.py
import qrcodeimport ioimport base64import timedef gen_qrcode(url): ''' 方式1： URL转换二维码 :param url: 转换二维码的URL :return: base64编码后的 二进制流 二维码数据 ''' qr = qrcode.make(url) buf = io.BytesIO() qr.save(buf) img_buf = buf.getvalue() img_stream = base64.b64encode(img_buf) return img_streamdef gen_qrcode_obj(version=1, box_size=10, border=4, url=None): ''' 方式2： URL转换二维码（图片流传输， template需要指明 data:base64编码） :param version: :param box_size: :param border: :return: ''' qr = qrcode.QRCode( version=version, error_correction=qrcode.constants.ERROR_CORRECT_L, box_size=box_size, border=border, ) url = 'https://www.12dms.com' if url is None else url save_name = './' + 'qrcode' + str(time.time()) + '.png' qr.add_data(url) qr.make() img = qr.make_image() img.save(save_name.encode()) with open(save_name, ’rb’) as img_f: img_stream = img_f.read() img_stream = base64.b64encode(img_stream) print(img_stream) return img_streamdef gen_qrcode_buf(words): qr = qrcode.make(words) buf = io.BytesIO() qr.save(buf, ’png’) qr_buf = buf.getvalue() # img_stream = base64.b64encode(qr_buf) return qr_buf
base.html
<!DOCTYPE html><html lang='en'><head> <meta charset='UTF-8'> <title>{% block title %}{% end %}</title> {% block head %}{% end %}</head><body> <h1 style='text-align: center'> {% block h1 %}{{ data }}{% end %} </h1> {% block content %}{% end %}</body></html>
qrcode.html
{% extends 'base.html' %}{% block title %} {{ title }}{% end %}{% block h1 %} {{ data }}{% end %}{% block content %} <form method='post' action='' > <p> 输入待转换的URL：<input name='url_str'/> <br>{# {{ img_stream }}#} {% if img_stream %}<img src='data:;base64,{{ img_stream }}' alt=''> {% end %} </p> <br> <input type='submit' value='生成二维码'> </form>{% end %}
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