Tornado Web Server框架编写简易Python服务器

我们都知道在Web开发中，都需要服务器，比如Java Web开发的Tomcat，WebLogic，WebSphere，现在来看利用Tornado Web Server框架如何写一个简易的Python服务器。

一般来说只需要实现get和post方法就可以了。以上次使用redis数据库的例子说明，数据库插入代码如下：

import redis
import datetime

class Database:
  def __init__(self):
    self.host = 'localhost'
    self.port = 6379
    self.write_pool = {}

  def add_write(self,website,city,year,month,day,deal_number):
    key = '_'.join([website,city,str(year),str(month),str(day)])
    val = deal_number
    self.write_pool[key] = val

  def batch_write(self):
    try:
      r = redis.StrictRedis(host=self.host,port=self.port)
      r.mset(self.write_pool)
    except Exception, exception:
      print exception

def add_data():
  beg = datetime.datetime.now()
  db = Database()
  for i in range(1,10000):
    db.add_write('meituan','beijing',2013,i,1,i)
  db.batch_write()
  end = datetime.datetime.now()
  print end-beg

if __name__ == '__main__':
  add_data()

以上代码插入了数据，那么现在用我们的服务器来访问一些数据。

import json
import redis
import tornado.web
import tornado.httpserver
from tornado.options import define, options

define("port", default=8888, type=int)

class DealHandler(tornado.web.RequestHandler):
  def initialize(self):
    self.port = 6379
    self.host = "localhost"

  def get(self):
    website = self.get_argument("website",None)
    city  = self.get_argument("city",None)
    year  = self.get_argument("year",None)
    month  = self.get_argument("month",None)

    keyset = []
    for i in range(1,31):
      key = '_'.join([website,city,year,month,str(i)])
      keyset.append(key)

    r = redis.StrictRedis(host=self.host,port=self.port)
    self.write( json.dumps(r.mget(keyset)) )

class ExampleHandler(tornado.web.RequestHandler):
  def get(self):
    who = self.get_argument("who", None)
    if who:
      self.write("Hello, " + who)
    else:
      self.write("Hello World!")

  def post(self):
    who = self.get_argument("who", None)
    if who:
      self.write("Hello, " + who)
    else:
      self.write("Hello World!")

class Application(tornado.web.Application):
  def __init__(self):
    handlers = [
      (r"/", ExampleHandler),
      (r"/deal", DealHandler),
    ]
    settings = dict()
    tornado.web.Application.__init__(self, handlers, settings)

def create_server():
  tornado.options.parse_command_line()
  http_server = tornado.httpserver.HTTPServer(Application())
  http_server.listen(options.port)
  tornado.ioloop.IOLoop.instance().start()

if __name__ == "__main__":
  create_server()

以上代码实现了一个简单的服务器，用于处理http请求。

在浏览器中输入：

http://localhost:8888/deal?website=meituan&city=beijing&year=2013&month=9

即可得到需要的数据。

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