目录

解析器

 （1）api/urls.py

# api/urls.pyfrom django.urls import path,re_pathfrom .views import UserView,PaserViewurlpatterns = [    re_path('(?P
     
      [v1|v2]+)/users/', UserView.as_view(),name = 'api_user'),    path('paser/', PaserView.as_view(),),   #解析]
     

（2）views.py

from rest_framework.parsers import JSONParser,FormParserclass 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

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

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

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

#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"]}