Django rest framework（5）----解析器

解析器

 （1）api/urls.py

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# api/urls.py   from django.urls import path,re_path from .views import UserView,PaserView   urlpatterns = [     re_path('(?P<version>[v1|v2]+)/users/', UserView.as_view(),name = 'api_user'),     path('paser/', PaserView.as_view()),   #解析 ]

　　

（2）views.py

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from rest_framework.parsers import JSONParser,FormParser   class PaserView(APIView):       parser_classes = [JSONParser,FormParser,]     #JSONParser：表示只能解析content-type:application/json的头     #FormParser:表示只能解析content-type:application/x-www-form-urlencoded的头       def post(self,request,*args,**kwargs):         #获取解析后的结果         print(request.data)         return HttpResponse('paser')

　　

（3）通过postman发送Json数据

在后台可以获取发过来的Json数据

 

源码流程

 （1）dispatch

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def dispatch(self, request, *args, **kwargs):         """         `.dispatch()` is pretty much the same as Django's regular dispatch,         but with extra hooks for startup, finalize, and exception handling.         """         self.args = args         self.kwargs = kwargs         #对原始request进行加工，丰富了一些功能         #Request(         #     request,         #     parsers=self.get_parsers(),         #     authenticators=self.get_authenticators(),         #     negotiator=self.get_content_negotiator(),         #     parser_context=parser_context         # )         #request(原始request,[BasicAuthentications对象，])         #获取原生request,request._request         #获取认证类的对象，request.authticators         #1.封装request         request = self.initialize_request(request, *args, **kwargs)         self.request = request         self.headers = self.default_response_headers  # deprecate?           try:             #2.认证             self.initial(request, *args, **kwargs)               # Get the appropriate handler method             if request.method.lower() in self.http_method_names:                 handler = getattr(self, request.method.lower(),                                   self.http_method_not_allowed)             else:                 handler = self.http_method_not_allowed               response = handler(request, *args, **kwargs)           except Exception as exc:             response = self.handle_exception(exc)           self.response = self.finalize_response(request, response, *args, **kwargs)         return self.response

　　

（2）initialize_request

获取所有解析器

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def initialize_request(self, request, *args, **kwargs):         """         Returns the initial request object.         """         parser_context = self.get_parser_context(request)           return Request(             request,             parsers=self.get_parsers(),                  #获取所有的解析器             authenticators=self.get_authenticators(),    #[BasicAuthentication(),],把所有的认证类对象封装到request里面了             negotiator=self.get_content_negotiator(),             parser_context=parser_context         )

　　

（3）get_parsers

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def get_parsers(self):     """     Instantiates and returns the list of parsers that this view can use.     """     return [parser() for parser in self.parser_classes]

　　

（4）parser_classes

 

 同样我们可以在settings里面全局配置

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#全局配置 REST_FRAMEWORK = {     #版本     "DEFAULT_VERSIONING_CLASS":"rest_framework.versioning.URLPathVersioning",       #解析器     "DEFAULT_PARSER_CLASSES":["rest_framework.parsers.JSONParser","rest_framework.parsers.FormParser"] }

 

这个解析器好简单啊