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。

来源：https://blog.csdn.net/Lockey23/article/details/80659323