Django如何处理一个请求

Django如何处理一个请求

当一个用户通过网页发送一个请求给Django网站，Django执行过程如下：

1. 首先访问项目下的settings.py文件中 ROOT_URLCONF = ‘test1.urls’

2. 执行项目包下的urls.py文件中的urlpatterns列表

3. 根据匹配的url正则调用相应的视图函数/通用视图

4. 如果没有匹配的正则，将会自动调用Django错误处理页面

url函数配置方式

• 方式1

#student/urls.py

from django.conf.urls import url
from . import views

urlpatterns=[
    url(r'^query$',views.queryAll)

]

#student/views.py

from django.http import HttpResponse
from django.shortcuts import render

def queryAll(request):

    return HttpResponse('hello world')
    
    
    

#访问地址
http://127.0.0.1:8000/student/query

• 方式2:位置传参

#student/urls.py


from django.conf.urls import url
from . import views

urlpatterns=[
    
    url(r'^query/(\d{2})$',views.queryAll),

]


#student/views.py

from django.http import HttpResponse
from django.shortcuts import render

def queryAll(request,sno):
    print(sno) #打印参数
    return HttpResponse('hello world')


#访问地址
http://127.0.0.1:8000/student/query/12

• 方式3：关键字传参

urlpatterns=[
  
    url(r'^query/(?P[0-9]{4})/(?P[0-9]{2})/(?P[0-9]{2})/$', views.queryAll),

]


def queryAll(request,year,day,month):
    print year,month,day
    return HttpResponse('hello world')
    
    
#访问地址
http://127.0.0.1:8000/student/query/2008/10/12/   
 
 

• 方式4：加载其他映射文件

from django.conf.urls import include, url

urlpatterns = [
     
    url(r'^community/', include('aggregator.urls')),

]

• 方式5：传参(参数名必须保持一致)

urlpatterns=[
    
    url(r'^query/(?P\d{3})/$',views.queryAll,{'hello':'123'}),
]



def queryAll(request,num1,hello):
    print num1,hello
    return HttpResponse('hello world')
    
#访问地址   
http://127.0.0.1:8000/student/query/888/