web框架 

1. web框架的本质:
	socket服务端  与 浏览器的通信
2. 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)
	
3. Python中 Web框架的分类:
	
	1. 按上面三个功能划分:
		1. 框架自带a,b,c                 --> Tornado
		2. 框架自带b和c,使用第三方的a    --> Django
		3. 框架自带b,使用第三方的a和c    --> Flask
	2. 按另一个维度来划分:
		1. Django   --> 大而全(你做一个网站能用到的它都有)
		2. 其他     --> Flask 轻量级

　　

import time
from wsgiref.simple_server import make_server


# 将返回不同的内容部分封装成函数
def yimi(url):
    with open("yimi.html", "r", encoding="utf8") as f:
        s = f.read()
        now = str(time.time())
        s = s.replace("@@xx@@", now)
    return bytes(s, encoding="utf8")


def xiaohei(url):
    with open("xiaohei.html", "r", encoding="utf8") as f:
        s = f.read()
    return bytes(s, encoding="utf8")


# 定义一个url和实际要执行的函数的对应关系
list1 = [
    ("/yimi/", yimi),
    ("/xiaohei/", xiaohei),
]


def run_server(environ, start_response):
    start_response('200 OK', [('Content-Type', 'text/html;charset=utf8'), ])  # 设置HTTP响应的状态码和头信息
    url = environ['PATH_INFO']  # 取到用户输入的url
    func = None
    for i in list1:
        if i[0] == url:
            func = i[1]
            break
    if func:
        response = func(url)
    else:
        response = b"404 not found!"
    return [response, ]


if __name__ == '__main__':
    httpd = make_server('127.0.0.1', 8090, run_server)
    print("我在8090等你哦...")
    httpd.serve_forever()
wsgiref
from wsgiref.simple_server import make_server
from jinja2 import Template


def index():
    with open("09 jinja2版web框架.html", "r", encoding="utf-8") as f:
        data = f.read()
    template = Template(data)  # 生成模板文件
    # 从数据库中取数据
    import pymysql

    conn = pymysql.connect(
        host="127.0.0.1",
        port=3306,
        user="root",
        password="123456",
        database="day59",
        charset="utf8",
    )
    cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
    cursor.execute("select * from userinfo;")
    user_list = cursor.fetchall()
    # 实现字符串的替换
    ret = template.render({"user_list": user_list})  # 把数据填充到模板里面
    return [bytes(ret, encoding="utf8"), ]


def home():
    with open("home.html", "rb") as f:
        data = f.read()
    return [data, ]


# 定义一个url和函数的对应关系
URL_LIST = [
    ("/index/", index),
    ("/home/", home),
]


def run_server(environ, start_response):
    start_response('200 OK', [('Content-Type', 'text/html;charset=utf8'), ])  # 设置HTTP响应的状态码和头信息
    url = environ['PATH_INFO']  # 取到用户输入的url
    func = None  # 将要执行的函数
    for i in URL_LIST:
        if i[0] == url:
            func = i[1]  # 去之前定义好的url列表里找url应该执行的函数
            break
    if func:  # 如果能找到要执行的函数
        return func()  # 返回函数的执行结果
    else:
        return [bytes("404没有该页面", encoding="utf8"), ]


if __name__ == '__main__':
    httpd = make_server('', 8000, run_server)
    print("Serving HTTP on port 8000...")
    httpd.serve_forever()
jinja2.py
<!DOCTYPE html>
<html lang="zh-CN">
<head> 
    <title>Title</title>
</head>
<body>


<table border="1">
    <thead>
    <tr>
        <th>ID</th>
        <th>用户名</th>
        <th>密码</th>
    </tr>
    </thead>
    <tbody>
    {% for user in user_list %}
    <tr>
        <td>{{user.id}}</td>
        <td>{{user.name}}</td>
        <td>{{user.pwd}}</td>
    </tr>
    {% endfor %}
    </tbody>
</table>
</body>
</html>
jinja2.html

 

posted @ 2018-05-26 19:55  慕沁  阅读(99)  评论(0)    收藏  举报