Django 实现将图片转为Base64,然后使用json传输

import base64
import cv2

#通过opencv转base64
img_im= cv2.imread("D://32.png")
aa=base64.b64encode(cv2.imencode('.jpg',img_im)[1]).decode()
print(len(aa)) #17292

#通过bytes再转base64
bb=base64.b64encode(open("D://32.png", 'rb').read())
print(len(bb)) #43848

#客户端：
image1= cv2.imread("D://32.png")
aa=base64.b64encode(cv2.imencode('.jpg',image1)[1]).decode()
r = requests.post(url, data={"image": image1})
print(r.content.decode("utf-8"))

#服务端：
def image_base64(request):
 result = request.POST.get("image")
 img_byte = base64.b64decode(result)
 img_np_arr = np.fromstring(img_byte, np.uint8)
 image = cv2.imdecode(img_np_arr, cv2.IMREAD_COLOR)
 #image 已经转为矩阵了

#客户端：
image1= cv2.imread("D://32.png")
aa=base64.b64encode(cv2.imencode('.jpg',image1)[1]).decode()
r = requests.post(url, json={"image": image1})
print(r.content.decode("utf-8"))

#服务端：
def local_ocr_base64(request):
  # result = request.POST.get("image")
  data = request.body  
  data_json=simplejson.loads(data) #data是str格式的，需要转为json
  result=data_json["image"]
  img_byte = base64.b64decode(result)
  img_np_arr = np.fromstring(img_byte, np.uint8)
  image = cv2.imdecode(img_np_arr, cv2.IMREAD_COLOR)

MEDIA_URL = '/media/'
MEDIA_ROOT = os.path.join(BASE_DIR, 'media/')
IMAGE_ROOT = os.path.join(MEDIA_ROOT, 'images/')
WEB_HOST_MEDIA_URL = os.path.join('http://127.0.0.1:8000', MEDIA_URL[1:], 'images/')

import base64
import os
import re
from datetime import date, datetime
from rest_framework import status
from rest_framework.decorators import api_view
from rest_framework.response import Response

from Notes.settings import IMAGE_ROOT, WEB_HOST_MEDIA_URL

@api_view(['POST',])
def images(request):
  urls = ''
  dir_name = date.today().__str__().replace('-', '_', 2) # 2019_06_21
  dirs = os.path.join(IMAGE_ROOT, dir_name) # 将日期作为目录名
  if not os.path.isdir(dirs):
    os.makedirs(dirs) # 判断目录是否存在，不存在则创建
  for img in request.data['imgs']:
    strs = img.split(',')
    suffix = re.findall(r'/(\w+?);', strs[0])[0] # 取得文件后缀
    # 拼接服务器上的文件名
    # datetime.now()取得当前时间，精确到了微秒，一般来说是唯一的了，因为目录是日期，所以文件名就去掉日期，最后会是一串数字
    img_name = re.sub(r':|\.', '', datetime.now().__str__().split(' ')[1]) + '.' + suffix 
    img_path = os.path.join(dirs, img_name)
    with open(img_path, 'wb') as out:
      out.write(base64.b64decode(strs[1])) # base64解码，再写入文件
      out.flush()
      urls += os.path.join(WEB_HOST_MEDIA_URL, dir_name, img_name) + '[/--sp--/]' # 拼接URL，URL与URL之间用[/--sp--/]隔开
  result = {}
  result['status'] = status.HTTP_200_OK
  result['message'] = '图片上传成功'
  result['urls'] = urls[:len(urls) - len('[/--sp--/]')] # 去掉末尾的[/--sp--/]
  return Response(data=result)

from django.contrib import admin
from django.urls import path
from django.conf.urls.static import static # 需要添加这句，包含静态资源之类的
from note import views
from . import settings


urlpatterns = [
  path('notes/images/', views.images),
  path('admin/', admin.site.urls),
]
urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT) # 这句不设置的话，不能通过URL直接访问到图片

{
  "status": 200,
  "message": "图片上传成功",
  "urls": "http://127.0.0.1:8000/media/images/2019_06_21/073249204253.png[/--sp--/]http://127.0.0.1:8000/media/images/2019_06_21/073249854323.png"
}