Python后端框架（一）：Tornado的使用

python和javascript是轮子王语言，容易上手出机会，造轮子先不想，好好用起来，tornado开发代码量介于bottle和django之间，简单易用，异步特征，引入web和ioloop就可以用，安装依赖

pip install bokeh -i http://mirrors.aliyun.com/pypi/simple/ --trusted-host=mirrors.aliyun.com  --upgrade

main代码： 

# -*- coding:utf8 -
import tornado.web
import tornado.ioloop
import tornado.gen
from concurrent.futures import ThreadPoolExecutor
import tornado.concurrent
import json
import re

class BaseHandler(tornado.web.RequestHandler):
    
    def set_default_headers(self):
        self.set_header('Access-Control-Allow-Origin', '*')
        self.set_header('Access-Control-Allow-Headers', '*')
        self.set_header('Access-Control-Max-Age', 1000)
        self.set_header('Content-type', 'application/json')
        self.set_header('Access-Control-Allow-Methods', 'POST, GET, OPTIONS')
        self.set_header('Access-Control-Allow-Headers','Content-Type, Access-Control-Allow-Origin, Access-Control-Allow-Headers, X-Requested-By, Access-Control-Allow-Methods')

    def options(self):
        # 返回方法1
        self.set_status(20000) # 这里的状态码一定要设置200，建议
        self.finish()


class IndexHandler(BaseHandler):

    executor=ThreadPoolExecutor(1000)
    @tornado.gen.coroutine
    def get(self, *args, **kwargs):
        yield self.index_response()
    @tornado.concurrent.run_on_executor
    def index_response(self,*args,**kwargs):
        print (*args)
        foods_json=[{
        "code": 20000,
        "menu": [
          {
            "path": "/home/main",
            "name": "main",
            "label": "首页",
            "icon": "s-home",
            "url": "home/index"
          },
          {
            "path": "/home/mall",
            "name": "mall",
            "label": "商品管理",
            "icon": "video-play",
            "url": "mall/index"
          },
          {
            "path": "/home/user",
            "name": "user",
            "label": "用户管理",
            "icon": "user",
            "url": "User/index"
          },
          {
            "label": "其他",
            "icon": "location",
            "children": [
              {
                "path": "/page1",
                "name": "page1",
                "label": "页面1",
                "icon": "setting",
                "url": "Other/PageOne.vue"
              },
              {
                "path": "/page2",
                "name": "page2",
                "label": "页面2",
                "icon": "setting",
                "url": "Other/PageTwo.vue"
              }
            ]
          }
        ],
        "token": "radlfjdslfdfdfdsfdsf",
        "message": "获取成功"
      }];
        foods=json.dumps(foods_json,ensure_ascii=False)
        #self.set_header("Access-Control-Allow-Origin","*")
        #self.set_header('Access-Control-Allow-Methods', 'POST, GET, OPTIONS')
        #self.set_header("Access-Control-Allow-Headers","*,Content-Type")
        #self.set_header("Content-Type","application/json; charset=UTF-8")
        self.write(foods)


application = tornado.web.Application([
    ('/api/menu/getMenu', IndexHandler),
])

if __name__ == "__main__":
    application.listen(9999)
    tornado.ioloop.IOLoop.instance().start()

运行后结果：