django上传图片简单验证以及自动修改图片名称

django实现文件（图片）上传之后自动修改名称以及页面上传图片时的各种提醒：

1、先在你项目中添加一个文件夹如：system 在文件夹下添加__init__.py 和storage.py文件,并在storage.py中添加如下代码：

# -*- coding:utf-8 -*-
from django.core.files.storage import FileSystemStorage
from django.http import HttpResponse

class ImageStorage(FileSystemStorage):
    from django.conf import settings

    def __init__(self,location=settings.MEDIA_ROOT, base_url=settings.MEDIA_URL):
        #初始化
        super(ImageStorage,self).__init__(location,base_url)

    def _save(self,name,content):
        #重新文件上传
        import os,time,hashlib

        #获取文件后缀
        ext = os.path.splitext(name)[1]

        #文件目录
        d = os.path.dirname(name)

        #定义文件夹名称
        fn = hashlib.md5(time.strftime('%Y%m%d%H%M%S').encode('utf-8')).hexdigest()
        name = os.path.join(d,fn+ext)

        #调用父类方法
        return super(ImageStorage,self)._save(name,content)

2、在models.py文件中添加如下代码：

from django.db import models
from datetime import datetime
from system.stroage import ImageStorage
# Create your models here.

#文章咨询表
class Article(models.Model):
    title = models.CharField(max_length=250, null=False, verbose_name='标题', unique=True)
    content = models.TextField(verbose_name='内容')
    add_time = models.DateTimeField(verbose_name='添加时间', default=datetime.now)
    update_time = models.DateTimeField(verbose_name='修改时间', null=True)
    state = models.IntegerField(verbose_name='状态', default=1)
    cat_id = models.ForeignKey(Category, on_delete=models.CASCADE)
    t = datetime.now()
    cover_map = models.ImageField(verbose_name='缩列图',upload_to='article/%Y/%m/%d',default='1.png',storage=ImageStorage())

    class Meta:
        verbose_name = '文章'
        ordering = ['-add_time']

    def __str__(self):
        return self.title

    def delete(self, using=None, keep_parents=False):
        print(1111)