Create thumbnails for an ImageField in django(创建缩略图)
Create thumbnails for an ImageField in django，在django中创建缩略图的过程其实有两种方法，第一种方法是比较传统的就是直接使用写入的方法，第二种方式就是使用PIL，我这里针对自己项目的需要，需要实现直接上传直接切图的功能。
功能实现：
def upload_large_image_file(file, type='man'):
'''文件上传函数,上传的文件夹一定要存在'''
if file:
size = 480
#先移动文件，然后截取指定大小尺寸的文件
parser = ImageFile.Parser()
for content in file.chunks():
parser.feed(content)
img = parser.close()
width, height = img.size
if width > size:
delta = width / size
height = int(height / delta)
img.thumbnail((size, height), Image.ANTIALIAS)
name, ext = os.path.splitext(os.path.basename(file.name))
file_name = os.path.join('upload/'+type+'/large',name+'_large'+ext)
path_name = os.path.join(MEDIA_ROOT, file_name)
img.save(path_name)
return(file_name)
return(file_name)
def upload_middle_image_file(file, type='man'):
'''文件上传函数,上传的文件夹一定要存在'''
if file:
size = 320
#先移动文件，然后截取指定大小尺寸的文件
parser = ImageFile.Parser()
for content in file.chunks():
parser.feed(content)
img = parser.close()
width, height = img.size
if width > size:
delta = width / size
height = int(height / delta)
img.thumbnail((size, height), Image.ANTIALIAS)
name, ext = os.path.splitext(os.path.basename(file.name))
file_name = os.path.join('upload/'+type+'/middle',name+'_middle'+ext)
path_name = os.path.join(MEDIA_ROOT, file_name)
img.save(path_name)
return(file_name)
return(file_name)
def upload_small_image_file(file,type='man'):
'''文件上传函数,上传的文件夹一定要存在'''
if file:
size = 100
#先移动文件，然后截取指定大小尺寸的文件
parser = ImageFile.Parser()
for content in file.chunks():
parser.feed(content)
img = parser.close()
width, height = img.size
if width > size:
delta = width / size
height = int(height / delta)
img.thumbnail((size, height), Image.ANTIALIAS)
name, ext = os.path.splitext(os.path.basename(file.name))
file_name = os.path.join('upload/'+type+'/small',name+'_small'+ext)
path_name = os.path.join(MEDIA_ROOT, file_name)
img.save(path_name)
return(file_name)
return(file_name)因为是要传递三种不同尺寸的图片，并且图片的也不同，一个大的一个中等的一个小的。
创建的form是这样的 如下：
class ManCreateForm(forms.Form):
GENDER = (
(0, u'展示'),
(1, u'不展示'),
)
title = forms.CharField(max_length=255, label='标题',widget=forms.TextInput(attrs={'placeholder':'标题','class':'input-block-level span8'}))
url_address = forms.CharField(label='详情地址', widget=forms.TextInput(attrs={'placeholder':'详情地址','class':'input-block-level span8'}))
description = forms.CharField(label='详情简介',widget=forms.Textarea(attrs={'placeholder':'详情简介','class':'input-block-level span8'}))
large_image = forms.ImageField(label='大图',widget=forms.ClearableFileInput(attrs={'placeholder':'大图','class':'input-block-level span8'}))
middle_image = forms.ImageField(label='中图',widget=forms.ClearableFileInput(attrs={'placeholder':'中图','class':'input-block-level span8'}))
small_image = forms.ImageField(label='小图',widget=forms.ClearableFileInput(attrs={'placeholder':'小图','class':'input-block-level span8'}))
show = forms.ChoiceField(label='是否展示',widget=forms.Select,choices=GENDER)
def clean_title(self):
title = self.cleaned_data['title']
if title is None:
raise forms.ValidationError("标题不能为空")
return title
def clean_url_address(self):
url = self.cleaned_data['url_address']
validate = URLValidator()
try:
validate(url)
except ValidationError:
raise forms.ValidationError("详情地址必须是标准的url地址")
return url
class WomanCreateForm(forms.Form):
GENDER = (
(0, u'展示'),
(1, u'不展示'),
)
title = forms.CharField(max_length=255, label='标题',widget=forms.TextInput(attrs={'placeholder':'标题','class':'input-block-level span8'}))
description = forms.CharField(label='详情简介',widget=forms.Textarea(attrs={'placeholder':'详情简介','class':'input-block-level span8'}))
url_address = forms.CharField(label='详情地址',widget=forms.TextInput(attrs={'placeholder':'详情地址','class':'input-block-level span8'}))
large_image = forms.ImageField(label='大图',widget=forms.ClearableFileInput(attrs={'placeholder':'大图','class':'input-block-level span8'}))
middle_image = forms.ImageField(label='中图',widget=forms.ClearableFileInput(attrs={'placeholder':'中图','class':'input-block-level span8'}))
small_image = forms.ImageField(label='小图',widget=forms.ClearableFileInput(attrs={'placeholder':'小图','class':'input-block-level span8'}))
show = forms.ChoiceField(label='是否展示',widget=forms.Select,choices=GENDER)
def clean_title(self):
title = self.cleaned_data['title']
if title is None:
raise forms.ValidationError("标题不能为空")
return title
def clean_url_address(self):
url = self.cleaned_data['url_address']
validate = URLValidator()
try:
validate(url)
except ValidationError:
raise forms.ValidationError("详情地址必须是标准的url地址")
return url
class GiftsCreateForm(forms.Form):
GENDER = (
(0, u'展示'),
(1, u'不展示'),
)
title = forms.CharField(max_length=255, label='标题',widget=forms.TextInput(attrs={'placeholder':'标题','class':'input-block-level span8'}))
description = forms.CharField(label='详情简介',widget=forms.Textarea(attrs={'placeholder':'详情简介','class':'input-block-level span8'}))
url_address = forms.CharField(label='详情地址',widget=forms.TextInput(attrs={'placeholder':'详情地址','class':'input-block-level span8'}))
large_image = forms.ImageField(label='大图',widget=forms.ClearableFileInput(attrs={'placeholder':'大图','class':'input-block-level span8'}))
middle_image = forms.ImageField(label='中图',widget=forms.ClearableFileInput(attrs={'placeholder':'中图','class':'input-block-level span8'}))
small_image = forms.ImageField(label='小图',widget=forms.ClearableFileInput(attrs={'placeholder':'小图','class':'input-block-level span8'}))
show = forms.ChoiceField(label='是否展示',widget=forms.Select,choices=GENDER)
def clean_title(self):
title = self.cleaned_data['title']
if title is None:
raise forms.ValidationError("标题不能为空")
return title
def clean_url_address(self):
url = self.cleaned_data['url_address']
validate = URLValidator()
try:
validate(url)
except ValidationError:
raise forms.ValidationError("详情地址必须是标准的url地址")
return url三个类里面的内容基本上是一样的，只不过我追求名称的区分，就写了三个
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由 davidzhang创作并维护的 Gowhich博客采用创作共用保留署名-非商业-禁止演绎4.0国际许可证。
本文首发于
博客（
https://www.gowhich.com ），版权所有，侵权必究。
本文永久链接： https://www.gowhich.com/blog/352
版权声明
由 davidzhang创作并维护的 Gowhich博客采用创作共用保留署名-非商业-禁止演绎4.0国际许可证。
本文首发于 Gowhich博客（ https://www.gowhich.com ），版权所有，侵权必究。
本文永久链接： https://www.gowhich.com/blog/352