django搭建web (五) views.py

http请求:　HttpRequest
http响应:　HttpResponse

所在位置：django.http

isinstance(request,HttpResponse) True->request的类型就是HttpRequest

HttpRequest对象属性：

Attribute	Description
path	请求页面的全路径
method	```请求中使用的HTTP方法的字符串表示。全大写表示。例如
if quest.method == 'GET':

                       do_something()
                    elif request.method == 'POST':　
                        do_something_else() ```

|GET |包含所有HTTP GET参数的类字典对象 |
|POST |包含所有HTTP POST参数的类字典对象 |

    localhost:8000/hello/?name=12345

参数名为name,在接收的时候可以如下

    def hello(request):
        print(quest.GET.get('name'))

get()	如果key对应多个value,get()返回最后一个value

form-表单

response = HttpResponse("Here is the text of the web page",mimetype="text/plain")
return response

#等价
return render(request,'table.html',{'foo':'bar'})

t = loader.get_template('table.html')
c = {'foo':'bar'}
return HttpResponse(t.render(c,request),content_type="text/html")

from django.shortcuts import render_to_response
return render_to_response('table.html',{'foo':'bar'})

redirect 页面跳转

from django.shortcuts import redirect
... ...
return redirect('http://www.baidu.com')

locals()

#locals()将当前作用于的变量全部传递给模板变量
return render_to response('table.html',locals())

demo

# -*- coding: utf-8 -*-
from __future__ import unicode_literals

from django.shortcuts import render
from .models import myQuestion,myAnswer
# Create your views here.


def research(request):
    question_list = myQuestion.objects.all() 
    answer_list = myAnswer.objects.all()
    context = {'question_list':question_list,'answer_list':answer_list}
    return render(request,"polls/index.html",context)

在该demo中

首先从models中引入模型myQuestion,myAnswer

from .models import myQuestion,myAnswer

其次定义了一个函数hello,这个地方的hello名称要与urls.py中名称对应，例如hello出现在urls.py如下:

urlpatterns = [
    url(r'^$',views.hello,name = 'hello'),
]

之后调用

question_list = myQuestion.objects.all() 

函数，将myQuestion模型的全部变量以列表形式赋值给question_list，下句类似

然后

context = {'question_list':question_list,'answer_list':answer_list}

将列表转成字典，并起上名称，一同赋值给context

最后

return render(request,"polls/index.html",context)

将内容context放进templates/polls/index.html文件中渲染，显示