web框架和django基础(粗糙版)

web框架本质：
    浏览器：socket客户端
    服务器：socket服务端
   
    1.自己写socket服务端(最傻)
        #!/usr/bin/env python
        # -*- coding:utf-8 -*-
        import socket

        def handle_request(client):
            date = client.recv(1024)
            client.send(b'HTTP/1.1 200 OK ')
            client.send(b'Hello')
        def main():
            sock = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
            sock.bind(('localhost',8000))
            sock.listen(5)
            while True:
                conn,addr = sock.accept()
                handle_request(conn)
                conn.close()
        if __name__ == '__main__':
            main()
    2.次之(web框架的开发者) 
        WSGI：通用网关服务接口
            server_names = {
                'cgi': CGIServer,
                'flup': FlupFCGIServer,
                'wsgiref': WSGIRefServer,
                'waitress': WaitressServer,
                'cherrypy': CherryPyServer,
                'paste': PasteServer,
                'fapws3': FapwsServer,
                'tornado': TornadoServer,
                'gae': AppEngineServer,
                'twisted': TwistedServer,
                'diesel': DieselServer,
                'meinheld': MeinheldServer,
                'gunicorn': GunicornServer,
                'eventlet': EventletServer,
                'gevent': GeventServer,
                'geventSocketIO':GeventSocketIOServer,
                'rocket': RocketServer,
                'bjoern' : BjoernServer,
                'auto': AutoServer,
            }
        Python中的模块来实现web框架
            from wsgiref.simple_server import make_server
            def RunServer(environ, start_response):
                # environ 用户请求的相关信息
                # start_response  设置用户相应的相关信息
                start_response('200 OK', [('Content-Type', 'text/html')])
                return [bytes('<h1>Hello, web!</h1>', encoding='utf-8'), ]
            if __name__ == '__main__':
                httpd = make_server('localhost', 8000, RunServer)
                print("Serving HTTP on port 8000...")
                httpd.serve_forever()
               
    3.现成的web框架 Bottle,Flask,Django,tornado(不是用django写的)
       

       
四，Django
    web框架分两类：
    (功能齐全)
        Django        大而全
        Bottle,Flask,Tornado,Webpy
    安装：
        1.pip3 install django
        2.解压
            python3 setup.py install
            可执行文件  django-admin.exe 目录在python3下的script下
            #添加环境变量
           
        3.基本使用
            创建project
                django-admin startproject projectname(Mysite)
               
                mysite
                    - mysite        (配置文件)
                    - manage.py        (管理project)
                    - app(cmdb)
                        - models.py     数据库操作
                        - admin.py         配置django自带的后台管理
                        - apps.py         当前app的配置
                        - test.py        单元测试
                        - views.py        做业务处理
           
            运行
                cd mysite
                python3 manage.py runserver 127.0.0.1:8000
               
            创建app(处理业务逻辑)
                cd mysite
                python3 manage.py startapp cmdb
                python3 manage.py startapp monitor(监控)
               
        django的基本使用
            urls中的配置
                from cmdb(appname) import views
                urlpatterns = [
                    url(r'^admin/', admin.site.urls),#默认的管理界面
                    url(r'^index/', views.index),#自己配置的指向views.index
                ]
            views中的配置
                from django.shortcuts import HttpResponse
                # 至少一个参数request
                # request封装用户请求相关信息
                def index(request):
                    print(request.GET)
                    return HttpResponse('ok')