首页 > > 网络编程 > 其它 >

创建web站点（单例模式）

2018-06-18 00:39:10来源：未知阅读 ()

在python2.7下运行。

#!usr/bin/env python
# -*- coding:utf-8 -*-
from wsgiref.simple_server import make_server

插入单例模式，创建私有类型变量。其中静态方法 get_instance 为单例模式，

 1 class ConnectionPool:
 2 
 3     __instance = None
 4 
 5     def __init__(self):
 6         pass
 7 
 8     @staticmethod
 9     def get_instance():
10         if ConnectionPool.__instance:
11             return ConnectionPool.__instance
12         else:
13             ConnectionPool.__instance = ConnectionPool()
14             return ConnectionPool.__instance
15 
16     def get_connection(self):
17         import random
18         r = random.randrange(1,11)
19         return r

def index():
    p = ConnectionPool.get_instance()   # 访问web时主动调用单例模式 get_instance
    Con = p.get_connection()
    print(p)                            # 每次在内存中都是同一个对象
    return "INDEX" + str(Con)

RunServer

def RunServer(environ, start_response):
    start_response(status='200 0k', headers=[('Content-Type', 'text/html')])
    url = environ['PATH_INFO']
    if url.endswith('index'):
        ret = index()
        return ret
    else:
        return '404'

if __name__ == '__main__':
    httpd = make_server('', 8008, RunServer)
    print('Serving HTTP on port 8008....')
    httpd.serve_forever()