DRF——解析器

一 、解析器的作用：

对应 请求头的content_type选择对应的解析器对应的请求体内容进行处理

有application/json、x-www-form-urlencoded、form-data等格式

二、全局使用解析器

1、settiing文件中

REST_FRAMEWORK = {    'DEFAULT_PARSER_CLASSES':[        'rest_framework.parsers.JSONParser'        'rest_framework.parsers.FormParser'        'rest_framework.parsers.MultiPartParser'    ]}

2、路由层

urlpatterns = [    url(r'test/', TestView.as_view()),]

3、视图层中

from rest_framework.views import APIViewfrom rest_framework.response import Responseclass TestView(APIView):    def post(self, request, *args, **kwargs):        print(request.content_type)        # 获取请求的值，并使用对应的JSONParser进行处理        print(request.data)        # application/x-www-form-urlencoded 或 multipart/form-data时，request.POST中才有值        print(request.POST)        print(request.FILES)        return Response('POST请求，响应内容')    def put(self, request, *args, **kwargs):        return Response('PUT请求，响应内容')

三、局部使用：

1、仅处理请求头content-type为application/json的请求体

from django.conf.urls import url, includefrom web.views.s5_parser import TestViewurlpatterns = [    url(r'test/', TestView.as_view(), name='test'),]

from rest_framework.views import APIViewfrom rest_framework.response import Responsefrom rest_framework.request import Requestfrom rest_framework.parsers import JSONParserclass TestView(APIView):    parser_classes = [JSONParser, ]    def post(self, request, *args, **kwargs):        print(request.content_type)        # 获取请求的值，并使用对应的JSONParser进行处理        print(request.data)        # application/x-www-form-urlencoded 或 multipart/form-data时，request.POST中才有值        print(request.POST)        print(request.FILES)        return Response('POST请求，响应内容')    def put(self, request, *args, **kwargs):        return Response('PUT请求，响应内容')

2、仅上传文件

from django.conf.urls import url, includefrom web.views import TestViewurlpatterns = [    url(r'test/(?P<filename>[^/] )', TestView.as_view(), name='test'),]

#!/usr/bin/env python# -*- coding:utf-8 -*-from rest_framework.views import APIViewfrom rest_framework.response import Responsefrom rest_framework.request import Requestfrom rest_framework.parsers import FileUploadParserclass TestView(APIView):    parser_classes = [FileUploadParser, ]    def post(self, request, filename, *args, **kwargs):        print(filename)        print(request.content_type)        # 获取请求的值，并使用对应的JSONParser进行处理        print(request.data)        # application/x-www-form-urlencoded 或 multipart/form-data时，request.POST中才有值        print(request.POST)        print(request.FILES)        return Response('POST请求，响应内容')    def put(self, request, *args, **kwargs):        return Response('PUT请求，响应内容')

四、源码分析

1、通过reques.data 进行解析，由此入手

2、通过查看self._load_data_and_files()方法---->self._data, self._files = self._parse()

3、查看_parse

4、查看self.negotiator.select_parser(self, self.parsers)

5、最终调用parser的解析方法来解析parsed = parser.parse(stream, media_type, self.parser_context)

来源：https://www.icode9.com/content-4-305351.html