python学习第七十一天:django2与1的差别和视图

django1与2路由的差别

在django1中的url在django2中为re_path
django2中新增了path 1.from django.urls import path 2.不支持正则,精准匹配 3.5个转换器(int,str,slug,path,uuid4.自定义转换器: 1 写一个类: class Test: regex = '[0-9]{4}' def to_python(self, value): # 写一堆处理 value=value+'aaa' return value def to_url(self, value): return '%04d' % value 2 from django.urls import register_converter 3 register_converter(Test,'ttt'4 path('index/<ttt:year>', views.index,name='index'), 

MVC和MTV

    M          T                 V

	models	   template         views

	M          V                 C(路由+views)
	models    模板              控制器 其实MVC与MTV是一样的,django中为MTV,数据交互层,视图层以及控制层 

视图层:request对象

request对象:
# form表单,不写method ,默认是get请求 # 1 什么情况下用get:请求数据,请求页面, # 2 用post请求:向服务器提交数据 # request.GET 字典 # request.POST 字典 # 请求的类型 # print(request.method) # 路径 # http://127.0.0.1:8000/index/ppp/dddd/?name=lqz # 协议:ip地址和端口/路径?参数(数据) # print(request.path) -->/index/ppp/dddd/ # print(request.get_full_path()) -->/index/ppp/dddd/?name=lqz 

三件套

render
HttpResponse
redirect

JsonResponse

向前端页面发json格式字符串
封装了json
from django.http import JsonResponse

dic={'name':'lqz','age':18} li=[1,2,3,4] return JsonResponse(li,safe=False) 

CBV和FBV

CBVclass base view)和FBV(function base view) cbv: from django.views import View class Test(View): def dispatch(self, request, *args, **kwargs): # 分发 # 可加逻辑判断语句 obj=super().dispatch(request, *args, **kwargs) # 可加逻辑判断语句 return obj def get(self,request): obj= render(request,'index.html') print(type(obj)) return obj def post(self,request): return HttpResponse('ok') urls中: re_path(r'index/', views.Test.as_view()), 

简单文件上传

html中:
<form action="" method="post" enctype="multipart/form-data">
用户名:<input type="text" name="name"> 密码:<input type="text" name="password"> 文件:<input type="file" name="myfile"> <input type="submit"> </form> viewsclass Cbv(View): def dispatch(self, request, *args, **kwargs): obj = super().dispatch(request, *args, **kwargs) return obj def get(self,request): return render(request,'index.html') def post(self,request): aaa = request.FILES.get('myfile') with open(aaa.name,'wb') as f: for line in aaa.chunks(): f.write(line) return HttpResponse('ok')

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转载自www.cnblogs.com/luck-L/p/9595448.html