下载远程图像并将其保存到 Django 模型 [英] Download a remote image and save it to a Django model

问题描述

我正在编写一个 Django 应用程序，它将获取特定 URL 的所有图像并将它们保存在数据库中.

I am writing a Django app which will fetch all images of particular URL and save them in the database.

但我不了解如何在 Django 中使用 ImageField.

But I am not getting on how to use ImageField in Django.

设置.py

MEDIA_ROOT = os.path.join(PWD, "../downloads/")

# URL that handles the media served from MEDIA_ROOT. Make sure to use a
# trailing slash.
# Examples: "http://example.com/media/", "htp://media.example.com/"
MEDIA_URL = '/downloads/'

models.py

class images_data(models.Model):
        image_id =models.IntegerField()
        source_id = models.IntegerField()
        image=models.ImageField(upload_to='images',null=True, blank=True)
        text_ind=models.NullBooleanField()
        prob=models.FloatField()

download_img.py

download_img.py

def spider(site):
        PWD = os.path.dirname(os.path.realpath(__file__ ))
        #site="http://en.wikipedia.org/wiki/Pune"
        hdr= {'User-Agent': 'Mozilla/5.0'}
        outfolder=os.path.join(PWD, "../downloads")
        #outfolder="/home/mayank/Desktop/dreamport/downloads"
        print "MAYANK:"+outfolder
        req = urllib2.Request(site,headers=hdr)
        page = urllib2.urlopen(req)
        soup =bs(page)
        tag_image=soup.findAll("img")
        count=1;
        for image in tag_image:
                print "Image: %(src)s" % image
                filename = image["src"].split("/")[-1]
                outpath = os.path.join(outfolder, filename)
                urlretrieve('http:'+image["src"], outpath)
                im = img(image_id=count,source_id=1,image=outpath,text_ind=None,prob=0)
                im.save()
                count=count+1

我在一个视图中调用 download_imgs.py

I am calling download_imgs.py inside one view like

        if form.is_valid():
                url = form.cleaned_data['url']
                spider(url)

推荐答案

Django 文档 总是很好的起点

class ModelWithImage(models.Model):
    image = models.ImageField(
        upload_to='images',
    )

更新

所以这个脚本有效.

• 循环下载图像
• 下载图片
• 保存到临时文件
• 应用于模型
• 保存模型

.

import requests
import tempfile

from django.core import files

# List of images to download
image_urls = [
    'http://i.thegrindstone.com/wp-content/uploads/2013/01/how-to-get-awesome-back.jpg',
]

for image_url in image_urls:
    # Stream the image from the url
    response = requests.get(image_url, stream=True)

    # Was the request OK?
    if response.status_code != requests.codes.ok:
        # Nope, error handling, skip file etc etc etc
        continue
    
    # Get the filename from the url, used for saving later
    file_name = image_url.split('/')[-1]
    
    # Create a temporary file
    lf = tempfile.NamedTemporaryFile()

    # Read the streamed image in sections
    for block in response.iter_content(1024 * 8):
        
        # If no more file then stop
        if not block:
            break

        # Write image block to temporary file
        lf.write(block)

    # Create the model you want to save the image to
    image = Image()

    # Save the temporary image to the model#
    # This saves the model so be sure that it is valid
    image.image.save(file_name, files.File(lf))

一些参考链接:

1. requests - HTTP for Humans"，我更喜欢这个而不是 urllib2
2. tempfile - 保存临时文件而不是磁盘
3. Django 文件字段 保存

1. requests - "HTTP for Humans", I prefer this to urllib2
2. tempfile - Save temporay file and not to disk
3. Django filefield save

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