使用装饰器配置路由的

 

上面的 “Hello World” 修改如下：

# tornadoapp.py
import tornado.ioloop
import tornado.web

class Application(tornado.web.Application):
    def route(self, pattern):
        def _(handler):
            handler_pattern = [(pattern, handler)]
            self.add_handlers(".*$", handler_pattern)
            return handler
        return _

app = Application()

@app.route(r"/")
class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.write("Hello, world")

if __name__ == "__main__":
    app.listen(8888)
    tornado.ioloop.IOLoop.instance().start()