django设置并获取cookie/session，文件上传，ajax接收文件，post/get请求及跨域请求等的方法

django设置并获取cookie/session，文件上传，ajax接收文件等的方法：

views.py文件：

from django.shortcuts import render,HttpResponse,redirect
import datetime
import json
from .setMongodb import pinglun
from bson import ObjectId

# Create your views here.


def index(request):
    # print(render(request,'index.html').__dict__['_container'][0])
    print(render(request, 'index.html').content)

    return render(request, 'index.html')


def product(request,id):
    return render(request, 'product.html',{'pid':id})

def article(request,aid):
    return render(request, 'article.html', {'aid': aid})

#ajax返回数据
def jsonApi(request):
    dictobj = {'title': '标题'}
    a = HttpResponse(json.dumps(dictobj, ensure_ascii=False))
    # 允许你的域名来获取我的数据
    a['Access-Control-Allow-Origin'] = "*"

    # 允许你携带Content-Type请求头
    a['Access-Control-Allow-Headers'] = "Content-Type"
    return a


#GET/POST
def methodApi(request):
    # http = 'http://localhost:8000/methodApi?abc=123'
    if request.method=='GET':
        request.GET.get('abc')  # ===>123
        request.POST.get('username')  # ===>admin
    
    
    return HttpResponse('methodApi')


#设置cookie
def setcookie(request):
    a = HttpResponse('12345')
    # 设置cookies超过10秒失效，写法
    a.set_cookie('isLogin', 'true', max_age=60)

    # 从登录10秒后失效，写法
    current_time = datetime.datetime.utcnow()
    current_data = current_time + datetime.timedelta(seconds=10)
    a.set_cookie('key', 'value', expires=current_data)
    return a

#获取cookie的写法
def getcookie(request):
    islogin = request.COOKIES.get('isLogin')
    return HttpResponse(redirect('index'))



#设置session
def setsession(request):

    request.session['username'] = '老王'
    return HttpResponse('setsession')

#获取seseion
def getsession(request):
    # request.session.get('username')
    return HttpResponse(request.session['username'])

# 设置文件上传


def uploadfile(request):
    if request.method == 'GET':
        return render(request, 'upload.html')
    else:
        obj = request.FILES.get('files')
        print(obj)
        print(obj.__dict__)
        # print(obj.name,obj.size)  #读取文件名称和大小，返回后台

        f = open('./static/upload/'+obj.name, 'wb')
        for chunk in obj.chunks():
            f.write(chunk)
        f.close()
        return HttpResponse('图片上传成功')


def pinglunList(request):
    result =  pinglun.find()

    resList = []
    for item in result:
        item['_id'] = str(item['_id'])
        resList.append(item)
    
    # print(resList)
    jsonStr = json.dumps(resList,ensure_ascii=False)
    # print(jsonStr)
    
    a = HttpResponse(jsonStr)

    a['Access-Control-Allow-Origin'] = "*"

    # 允许你携带Content-Type请求头
    a['Access-Control-Allow-Headers'] = "Content-Type"
    return a


def addContent(request):
    print(request.GET.get('username'))
    contentDict = {
        'username': request.GET.get('username'),
        'headerimg': request.GET.get('headerimg'),
        'content': request.GET.get('content'),
        'zanNum': request.GET.get('zanNum')
    }
    print(contentDict)

    pinglun.insert(contentDict)




    a = HttpResponse('ok')

    a['Access-Control-Allow-Origin'] = "*"

    # 允许你携带Content-Type请求头
    a['Access-Control-Allow-Headers'] = "Content-Type"
    return a


def addzan(request):

    print(request.GET.get('_id'))

    _id = request.GET.get('_id')

    # res1 = pinglun.find_one({'_id': _id})
    res = pinglun.update({'_id': ObjectId(_id)}, {'$inc': {'zanNum': 1}})
    

    print(res)

    a = HttpResponse('ok')

    a['Access-Control-Allow-Origin'] = "*"

    # 允许你携带Content-Type请求头
    a['Access-Control-Allow-Headers'] = "Content-Type"
    return a