web框架介绍，从简到MVC架构解读

Posted 2021-05-01 洪伟学Python

# 作者 : 'zhw'
# IDE : PyCharm
# Version:Python3.6
# 创建时间: 2018/5/2 19:34
# coding = 'utf-8'

from wsgiref.simple_server import make_server
"""
    web框架：
        MVC： Model(数据库）, View(模版文件),Controller(业务处理)
        MTV:  Model(数据库), Template(模版文件), View(业务处理)
"""


def handle_index():    
    # return ["<h1>Hello,Index!</h1>".encode("utf-8"), ]
    import time
    v = str(time.time())
    f = open("index.html", mode="rb")
    data = f.read()
    data = data.replace(b"@bianliang", v.encode("utf-8"))     # Model
    return [data, ]


def handle_date():
    return ["<h1>Hello,date!</h1>".encode("utf-8"), ]


URL_DICT = {         ## Controller
    "/index": handle_index,
    "/date": handle_date,
}


def RunServer(environ, start_response):
    # environ 客户端发来的所有数据
    # start_response 封装要返回给用户的数据，响应头状态
    start_response("200 OK", [("Content-Type", "text/html")])
    current_url = environ["PATH_INFO"]
    # if current_url == "/index":
    #     return handle_index()
    # elif current_url == "/date":
    #     return handle_date()
    func = None
    if current_url in URL_DICT:
        func = URL_DICT[current_url]
    if func:
        return func()
    else:
        return ["<h1>404</h1>".encode("utf-8"), ]


if __name__ == "__main__":
    httpd = make_server("", 8000, RunServer)
    print("Server HTTP on port 8000...")
    httpd.serve_forever()