关于tornado实现登录和登出

main.py如下：

import tornado.httpserver
import tornado.ioloop
import tornado.web
import tornado.options
import os.path
 
from tornado.options import define, options
define("port", default=8000, help="run on the given port", type=int)
 
class BaseHandler(tornado.web.RequestHandler):
    def get_current_user(self):
        return self.get_secure_cookie("username")
class LoginHandler(BaseHandler):
    def get(self):
        self.render('login.html')
    def post(self):
        self.set_secure_cookie("username", self.get_argument("username"))
        self.redirect("/")
class WelcomeHandler(BaseHandler):
    @tornado.web.authenticated
    def get(self):
        self.render('index.html', user=self.current_user)

class LogoutHandler(BaseHandler):
    def post(self):
        if (self.get_argument("logout", None)):
            self.clear_cookie("username")
        self.redirect("/")
if __name__ == "__main__":
    tornado.options.parse_command_line()
    settings = {
        "template_path": os.path.join(os.path.dirname(__file__), "templates"),
        "cookie_secret": "bZJc2sWbQLKos6GkHn/VB9oXwQt8S0R0kRvJ5/xJ89E=",
        "login_url": "/login"
    }
    application = tornado.web.Application([
        (r'/', WelcomeHandler),
        (r'/login', LoginHandler),
        (r'/logout', LogoutHandler)
    ],debug= True,**settings)
    http_server = tornado.httpserver.HTTPServer(application)
    http_server.listen(options.port)
    tornado.ioloop.IOLoop.instance().start()

index.html

	
Hello {{ user }}
	

	

login.html

	Login Page
	Name: