import tornado.web       # web服务

import tornado.ioloop    # I/O 时间循环

class MainHandler(tornado.web.RequestHandler):

    def initialize(self,name):

    	self.name = name

        print 'initialize方法执行'

    def prepare(self):

        print 'prepare方法执行'

    def set_default_headers(self):

        print 'set_default_headers方法执行'

        self.set_header("Access-Control-Allow-Origin", "*")

        self.set_header("Access-Control-Allow-Headers", "x-requested-with")

        self.set_header("Access-Control-Allow-Methods", "POST, GET, OPTIONS")

    # 响应以get方式发起的请求

    def get(self, *args, **kwargs):

    	print 'get方法执行'

        self.write("hello world!")

    # 响应以post方式发起的请求

    def post(self, *args, **kwargs):

        print 'post方法执行'

        self.write(json.dumps({"status": "success", "data": task_list}))

    def on_finish(self):

        print 'on_finish方法执行'

    def write_error(self, status_code, **kwargs):

        print 'write_error方法执行'

        super().write_error(status_code, **kwargs)

app = tornado.web.Application([

        (r"/index", MainHandler, dict(name="name")),

    ])

if __name__ == "__main__":

    app.listen(8000)  # 监听端口

    # tornado.ioloop.IOLoop.current().start()

    tornado.ioloop.IOLoop.instance().start()  # 开始事件