小白学习tornado第二站-tornado简单介绍

from datetime import datetime

import tornado.ioloop
import tornado.web


class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.write("Hello, world")
        # self.write_error(500)       # 输出错误响应
        # self.set_status(500)        # 设置错误响应

    def prepare(self):               # 先被执行
        print(‘prepare‘ + str(datetime.now()))
        self.write(‘in prepare‘)


class IndexHandler(tornado.web.RequestHandler):
    def get(self):
        self.redirect(r‘/‘)         # 重定向


class PictureHandler(tornado.web.RequestHandler):
    def get(self):
        self.write(‘<img height="160" width="230" src="https://tse2-mm.cn.bing.net/th?id=OIP.VvmsvFfpntCllfa7uQbfrQHaEK&amp;w=230&amp;h=160&amp;c=7&amp;o=5&amp;pid=1.7">‘)


def make_app():
    return tornado.web.Application([
        (r"/", MainHandler),    # 路由表映射
        (r"/index/", IndexHandler),
        (r‘/pic/‘, PictureHandler),
    ],
    debug=True,         # setting关键字
    )


if __name__ == "__main__":
    app = make_app()
    app.listen(8000)
    tornado.ioloop.IOLoop.current().start()