模拟Django，搭建web服务器

socket服务端功能划分:
a.负责与浏览器收发消息(socket通信) --> wsgiref / uWsgi / gunicorn…

b.根据用户访问不同的路径执行不同的函数

c.从HTML读取出内容, 并且完成字符串的替换 --> jinja2(模板语言)
Django实现了b、c两部分，a借助了第三方库实现。以下为Django框架的大致流程。

import socket

server = socket.socket()     #创建套接字，实现socket服务端功能
server.bind(("127.0.0.1", 8888))
server.listen()
def xm(url):
    # result = "hello {}".format(url)
    with open('xiaoming.html', 'r', encoding='utf8') as f:
        result = f.read()
        result = result.replace('xxoo', '文明你我他')    #实现了字符串替换
    return bytes(result, encoding='utf8')

def wrong_page(url):
    with open('wrongpage.html', 'r', encoding='utf8') as f:
        result = f.read()
        # result.replace('xxoo', '文明你我他')
    return bytes(result, encoding='utf8')

def xh(url):
    with open('小红.html', 'r', encoding='utf8') as f:
        result = f.read()
        result = result.replace('xxoo', '文明你我他')
    return bytes(result, encoding='utf8')


url_view = [('/xiaoming', xm), ('/xiaohong', xh)]     #路由与函数的映射

while True:
    con, ip = server.accept()
    data = con.recv(8096)
    # print(data)
    request_header = str(data, encoding='utf-8').split('\r\n')
    request_url = request_header[0].split()[1]
    # print(request_url)
    con.send(b"http/1.1 200 ok\r\ncontent-type: text/html; charset=utf-8\r\n\r\n")
    # if request_url == '/xiaoming':
    #     response = "
hello {}!
".format('xiaoming')
    #     con.send(bytes(response, encoding='utf8'))
    # else:
    #     con.send(b'
404
')
    for current_url, f in url_view:
        if current_url == request_url:
            func = f
            break
    else:
        func = wrong_page
    con.send(func(current_url))
    con.close()