Django(一)

HTTP协议对于收发消息的格式要求如下图：

 

wsgiref版返回动态的HTML文件

'''
根据访问的不同路径返回不同的内容
实现不同的用户得到不同的HTML页面
'''

import time
from wsgiref.simple_server import make_server


def home(url):
    s = 'this is {} page'.format(url)
    return bytes(s,encoding='utf8')

def index(url):
    return b'<h1>index page</h1>'

def user(url):
    c_time = str(time.time())
    with open('user.html','r') as f:
        data_s = f.read()
        data_s = data_s.replace('@@xx@@',c_time)  #用时间戳模拟不同的用户访问
        return bytes(data_s,encoding='utf8')

def login(url):
    with open('login.html','rb') as f:
        return f.read()

url_func = [
    ('/index/',index),
    ('/home/',home),
    ('/user/',user),
    ('/login/',login),
]

def run_server(environ,start_response):
    '''
    按照wsgiref的要求定义一个run_server函数
    :param environ: 跟请求相关的参数
    :param start_response:
    :return:
    '''
    start_response('200 OK',[('Content-Type','text/html;charset=utf8'),])
    # print('查看environ参数:',environ)   #查看environ参数
    url = environ['PATH_INFO']  #拿到用户输入的url
    print(url)

    for i in url_func:
        if url == i[0]:
            func = i[1]
            break
    else:
        func = None

    if func:
        msg = func(url)
    else:
        msg = b'<h1>404</h1>'
    return [msg,]

if __name__ == '__main__':
    httpd = make_server('127.0.0.1',8000,run_server)
    print(httpd)
    httpd.serve_forever()

jinja2返回动态的HTML文件

'''
利用jinja2进行路径切割替换
'''

from wsgiref.simple_server import make_server
from jinja2 import Template
import pymysql


def home(url):
    s = 'this is {} page'.format(url)
    return bytes(s,encoding='utf8')

def index(url):
    return b'<h1>index page</h1>'

def user(url):
    conn = pymysql.connect(
        host = '127.0.0.1',
        port = 3306,
        user = 'root',
        password = '123456789',
        database = 'day61',
        charset = 'utf8',
    )
    cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
    cursor.execute('select * from user')
    ret = cursor.fetchall()
    #在页面上显示出来
    with open('user.html','r',encoding='utf8') as f:
        data_s = f.read()
        template = Template(data_s)
        msg = template.render({'user_list':ret})
        return bytes(msg,encoding='utf8')


def login(url):
    with open('login1.html','rb') as f:
        return f.read()

url_func = [
    ('/index/',index),
    ('/home/',home),
    ('/user/',user),
    ('/login/',login),
]

def run_server(environ,start_response):
    '''
    按照wsgiref的要求定义一个run_server函数
    :param environ: 跟请求相关的参数
    :param start_response:
    :return:
    '''
    start_response('200 OK',[('Content-Type','text/html;charset=utf8'),])
    # print('查看environ参数:',environ)   #查看environ参数
    url = environ['PATH_INFO']  #拿到用户输入的url
    # print(url)

    for i in url_func:
        if url == i[0]:
            func = i[1]
            break
    else:
        func = None

    if func:
        msg = func(url)
    else:
        msg = b'<h1>404</h1>'
    return [msg,]

if __name__ == '__main__':
    httpd = make_server('127.0.0.1',8000,run_server)
    # print(httpd)
    httpd.serve_forever()

Django命令行创建方式：

django-admin startproject mysite

Django基础重要的3个要素

from django.shortcuts import HttpResponse, render, redirect