前言： 启动一个tornado 服务器基本代码
class HomeHandler(tornado.web.RequestHandler): #创建 RequesHandler 对象，处理接收到的 http 请求
def get(self):
entries = self.db.query("SELECT * FROM entries ORDER BY published DESC LIMIT 5")
if not entries:
self.redirect("/compose")
return
self.render("home.html", entries=entries) class Application(tornado.web.Application): #创建 Application 对象， 定义 setting 和 URL 映射规则
def __init__(self):
handlers = [
(r"/", HomeHandler),
(r"/archive", ArchiveHandler),
]
settings = dict(
blog_title=u"Tornado Blog",
template_path=os.path.join(os.path.dirname(__file__), "templates"),
static_path=os.path.join(os.path.dirname(__file__), "static"),
ui_modules={"Entry": EntryModule},
xsrf_cookies=True,
debug=True,
)
tornado.web.Application.__init__(self, handlers, **settings) #将参数设置传递到父类 Application中 def main():
http_server = tornado.httpserver.HTTPServer(Application()) #传递 Application 对象，封装成 HTTPServer 对象
http_server.listen(8000) #启动 HTTPServer 监听，实际上 HTTPServer 继承自 TCPServer，是在TCPServer 中启动 listen Socket 端口
tornado.ioloop.IOLoop.instance().start() 获取全局IOLoop 单例，启动IOLoop 大循环