Django uses request to get the parameters sent by the browser

Getting data (four ways)

1. url: 需要正则去匹配
    url(r'^index/(num)/$', view.index)
    匹配到的参数会自动传入对应的视图函数

    也可以给匹配到的参数起名字?P<num>
    url(r&#39;^index/(?P<num1>\d*)(?P<num2>\w*)$&#39;,)

    使用url传参的时候,要么都使用位置参数,要么都使用给参数起名字的方式

    也可以通过request.path获取到url然后获取相应的参数.
    如访问127.0.0.1:8000/index/
    则request.path = &#39;/index/&#39;2. ?号后面的键值对(又叫查询字符串): 
    如 index/?num=55&num2=66&num=77
    request.GET.get(&#39;num&#39;) # 获取的是77
    request.GET.getlist(&#39;num&#39;) # 获取num的所有值
    request.GET.get(&#39;num2&#39;) 

3. 请求体
    request.POST.get() 获取表单数据

    request.body 获取非表单数据,如json
    request.body返回的是一个byte的对象
        b&#39;{"key":"value"}&#39;,可以通过下面方式获取值
    data = eval(request.body.decode()).get(&#39;key&#39;)
    data1 = json.loads(request.body).get(&#39;key&#39;)    #如果request.body没有数据上面两条语句都会报错4. 报文头
    request.META 获取请求头信息,
    django会自动把获取到的请求头全部转化为大写,并在前面加上HTTP,如:
    请求头: User-Agent:***** 
    获取方式: request.META.get(&#39;HTTP_USER_AGENT&#39;)

• Code sample (getting request data)

# 获取正则匹配到的数据,num1未位置参数,num2为命名参数,def index(request,num2=None, num1=None):
    print(num2)    # 构造响应数据
    reNT')
    sp = HttpResponse('hello world')

    # 获取请求头
    header = request.META.get('HTTP_USER_AGE)
    # 获取地址
    path = request.path    # 获取 ? 后面的数据(获取查询字符串数据)
    para = request.GET

    # 获取json数据
    json_data = request.body
    data = eval(request.body.decode()).get('asd')
    data1 = json.loads(request.body).get('asd')
    # 获取表单数据
    form_data = request.POST    # 获取请求方法
    method = request.method    # 获取文件
    file_obj = request.FILES.get('image')

    return resp

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