Tornado学习总结4
一个Tornado的Web应用会将一组URL映射到tornado.web.RequestHandler的子类上去，子类中定义了get()和post()方法用以处理不同的HTTP请求。
下面代码将根目录/映射到MainHandler，将一个URL模式/story/([0-9]+)映射到StoryHandler.
class MainHandler(tornado.web.RequestHandler): def get(self): self.write("You request the main page")class StoryHandler(tornado.web.RequestHandler): def get(self,story_id): self.write("You requested the story " + story_id)application = tornado.web.Application([(r"/",MainHandler),(r"/story/([0-9]+)",StoryHandler),])使用get_argument()方法获取发送过来的参数：
class MainHandler(tornado.web.RequestHandler): def get(self): self.write('<html><body><form action="/" method="post">' '<input type="text" name="message">' '<input type="submit" value="Submit">' '</form></body></html>') def post(self): self.set_header("Content-Type","text/plain") self.write("You wrote "+ self.get_argument("message"))