向服务器传参

1. 通过url - path传参

 path('articles/<int:year>/<int:month>/<slug:slug>/', views.article_detail),

2. 查询字符串方式传参

http://localhost:8000?key1=value1&key2=value2 ;

3. （body）请求体的方式传参，比如文件，照片等
4. 在http的报文的头（header）中传参
   

传参练习

子应用

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

# Create your views here.
def index(request):
    return HttpResponse("视图测试...")

def weather(request,city,date):
    return HttpResponse(f'weather :城市 {city} 日期:{date}')

from django.contrib import admin
from django.urls import path,include
from .views import *
urlpatterns = [
    path('index/',index ),
    # 路由转换器提取
    path('weather/<str:city>/<int:date>', weather),
]

Django中的QueryDict对象

定义在django.http.QueryDict
HttpRequest对象的属性GET、POST都是QueryDict类型的对象
与python字典不同，QueryDict类型的对象用来处理同一个键带有多个值的情况
获取请求路径中的查询字符串参数（形如?k1=v1&k2=v2），可以通过request.GET属性获取，返回
QueryDict对象。

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


# Create your views here.
def index(request):
    return HttpResponse("视图测试...")


def weather(request, city, date):
    return HttpResponse(f'weather :城市 {city} 日期:{date}')


def qs(request):
    """查询字符串获取"""
    a = request.GET.get("num")
    b = request.GET.get("price")
    b_list = request.GET.getlist("price")
    return HttpResponse(f'参数a：{a}, 参数b：{b} 参数b(列表)：{b_list}')

from django.contrib import admin
from django.urls import path,include
from .views import *
urlpatterns = [
    path('index/',index ),
    # 路由转换器提取
    path('weather/<str:city>/<int:date>', weather),
    path('qs/',qs),
]

请求体

get - post：两种不同的请求方式

请求体数据格式不固定，可以是表单类型字符串，可以是JSON字符串，可以是XML字符串，应区别对
待。
可以发送请求体数据的请求方式有POST、PUT、PATCH、DELETE
Django默认开启了CSRF防护，会对上述请求方式进行CSRF防护验证，在测试时可以关闭CSRF防护机制，方法为在settings.py文件中注释掉CSRF中间件，如：

表单类型 Form Data

前端发送的表单类型的请求体数据，可以通过request.POST属性获取，返回QueryDict对象。

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


# Create your views here.
def index(request):
    return HttpResponse("视图测试...")


def weather(request, city, date):
    return HttpResponse(f'weather :城市 {city} 日期:{date}')


def qs(request):
    """查询字符串获取"""
    a = request.GET.get("num")
    b = request.GET.get("price")
    b_list = request.GET.getlist("price")
    return HttpResponse(f'参数a：{a}, 参数b：{b} 参数b(列表)：{b_list}')

def regist(request):
    """注册表单
    1.取表单，返回表单
    2.获取用户通过表单填写的用户信息"""
    if request.method == 'GET':
        return render(request,'reqister.html')
    elif request.method == 'POST':
        return HttpResponse('post请求')

"""
Django settings for HighDjangoProject project.

Generated by 'django-admin startproject' using Django 2.2.8.

For more information on this file, see
https://docs.djangoproject.com/en/2.2/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/2.2/ref/settings/
"""

import os

# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))


# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/2.2/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = '3^9vuh6$ya+bh0bkdj4)m7_0wji2i+o1gh7rm@2)1*sosk(n_h'

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True

ALLOWED_HOSTS = []


# Application definition

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'urldemo.apps.UrldemoConfig',
    # 手动注册子应用
    'viewdemo.apps.ViewdemoConfig'
]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
   # 'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

ROOT_URLCONF = 'HighDjangoProject.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [os.path.join(BASE_DIR, 'templates')]
        ,
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

WSGI_APPLICATION = 'HighDjangoProject.wsgi.application'


# Database
# https://docs.djangoproject.com/en/2.2/ref/settings/#databases

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
    }
}


# Password validation
# https://docs.djangoproject.com/en/2.2/ref/settings/#auth-password-validators

AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]


# Internationalization
# https://docs.djangoproject.com/en/2.2/topics/i18n/

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True


# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/2.2/howto/static-files/

STATIC_URL = '/static/'

from django.contrib import admin
from django.urls import path,include
from .views import *
urlpatterns = [
    path('index/',index ),
    # 路由转换器提取
    path('weather/<str:city>/<int:date>', weather),
    path('qs/',qs),
    path('register/', regist),
]

非表单类型 Non-Form Data

非表单类型的请求体数据 (ajax提交数据)，Django无法自动解析，可以通过request. body属性获取最
原始的请求体数据，自己按照请求体格式（JSON、XML等）进行解析。request.body返回bytes类
型

请求头

可以通过request.META属性获取请求头headers中的数据，request.META为字典类型。
常见的请求头如：
CONTENT_LENGTH – The length of the request body (as a string).
CONTENT_TYPE – The MIME type of the request body.
HTTP_ACCEPT – Acceptable content types for the response.
HTTP_ACCEPT_ENCODING – Acceptable encodings for the response.
HTTP_ACCEPT_LANGUAGE – Acceptable languages for the response.
HTTP_HOST – The HTTP Host header sent by the client.
HTTP_REFERER – The referring page, if any.
HTTP_USER_AGENT – The client’s user-agent string.
QUERY_STRING – The query string, as a single (unparsed) string.
REMOTE_ADDR – The IP address of the client.
REMOTE_HOST – The hostname of the client.
REMOTE_USER – The user authenticated by the Web server, if any.
REQUEST_METHOD – A string such as “GET” or “POST” .
SERVER_NAME – The hostname of the server.
SERVER_PORT – The port of the server (as a string).

其他常用HttpRequest对象属性

requtest.GET
requtest.POST
request.META
method：一个字符串，表示请求使用的HTTP方法，常用值包括：‘GET’、‘POST’。
user：请求的用户对象。（如获取user属性值，需访问django_session表 makemigrations
migrate）
path：一个字符串，表示请求的页面的完整路径，不包含域名和参数部分。
encoding：一个字符串，表示提交的数据的编码方式。
如果为None则表示使用浏览器的默认设置，一般为utf-8。
这个属性是可写的，可以通过修改它来修改访问表单数据使用的编码，接下来对属性的任何
访问将使用新的encoding值。
FILES：一个类似于字典的对象，包含所有的上传文件