Python/Django后端使用PIL Image生成头像缩略图

本文实例为大家分享了Python/Django后端使用PIL Image生成头像缩略图的具体代码,供大家参考,具体内容如下

import os

from django.views.generic import View

from myapp.models import User

from PIL import Image

def make_thumbnail(infile,thumbnail_dir):

size = (156, 156)

if not os.path.exists(thumbnail_dir):#判断缩略图存储目录是否存在then新建

os.mkdir(thumbnail_dir)

outfile = os.path.join( thumbnail_dir, os.path.basename(infile))

try:

im = Image.open(infile)#Key Point

im.thumbnail(size)#Key Point

im.save(outfile, "JPEG")#Key Point

return True

except IOError, err:

print("cannot create thumbnail for", infile,err)

return False

class Useravatar(View):

def __init__(self):

self.thumbnail_dir = os.path.join(STATIC_ROOT, 'avatar/thumbnails')

self.dest_dir = os.path.join(STATIC_ROOT, 'avatar/origin_imgs')

@method_decorator(login_required)

def post(self, request):

nt_id = request.session.get('nt_id', 'default')

user = User.objects.get(pk=nt_id) if User.objects.filter(pk=nt_id).exists() else None

avatarImg = request.FILES['avatar']

if not os.path.exists(self.dest_dir):#判断原图存储目录是否存在then新建

os.mkdir(self.dest_dir)

dest = os.path.join(self.dest_dir, nt_id+"_avatar.jpg")

with open(dest, "wb+") as destination:#先保存原图

for chunk in avatarImg.chunks():

destination.write(chunk)

if make_thumb(dest,self.thumbnail_dir):#使用原图创建缩略图

avartaPath = os.path.join(STATIC_URL, 'avatar/thumbnails', nt_id + "_avatar.jpg")

else:

avartaPath = os.path.join(STATIC_URL, 'avatar/origin_imgs', nt_id + "_avatar.jpg")

User.objects.filter(nt_id=nt_id).update(avatar=avartaPath)

return render(request, 'profile.html', {'user': user})

示例代码中将制作缩略图的函数从基于类的视图中分离出来了(为了清晰起见),实际编程过程中可以定义为类方法方面调用。

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