python-图片流传输的思路及示例(url转换二维码)
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2022-03-27 09:21:51
1.场景 将url动态生成二维码前端展示(微信支付等,)--》 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...
1.场景
- 将url动态生成二维码前端展示(微信支付等,)--》
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--》tornado
manager.py
import os import asyncio import tornado.ioloop import tornado.httpserver import tornado.web import tornado.options from tornado.options import define, options, parse_command_line from apps import urlhandler, url2handler, url3handler define("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 application if __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.web from manager_handler import gen_qrcode, gen_qrcode_obj,gen_qrcode_buf class basehandler(tornado.web.requesthandler): pass class 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 qrcode import io import base64 import time def 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_stream def 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_stream def 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 style="width:180px" src="data:;base64,{{ img_stream }}" alt=""> {% end %} </p> <br> <input id="submit" type="submit" value="生成二维码"> </form> {% end %}
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