在你的应用程序中validators.py：
def validate_file_extension(value):
import os
from django.core.exceptions import ValidationError
ext = os.path.splitext(value.name)[1] # [0] returns path+filename
valid_extensions = ['.pdf', '.doc', '.docx', '.jpg', '.png', '.xlsx', '.xls']
if not ext.lower() in valid_extensions:
raise ValidationError('Unsupported file extension.')
然后在你的models.py：
from .validators import validate_file_extension
…并在表单字段中使用验证器：
class Document(models.Model):
file = models.FileField(upload_to="documents/%Y/%m/%d", validators=[validate_file_extension])
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