如何在Google App Engine中加载Blobproperty图像？

Question

我写了一些代码.

我可以在BobProperty中保存图像.

但是我无法将图片加载到HTML页面中......

源代码:

class Product(db.Model):

        image = db.BlobProperty()
            ...

class add:

  productImage = self.request.get('image')

  product.image = db.Blob(productImage)

  product.put()

但我在html代码中写了{{product.image}}.但有像??? ???? ???? ???? (????????????????????????????????????????????????????????????????????????????? ?????ÿ??????ķ???

如果我想从数据存储中加载图像,该怎么办？

Answer 1

我使用辅助视图:

def serve_image(request, image):
    if image == "None":
        image = ""

    response = HttpResponse(image)
    response['Content-Type'] = "image/png"
    response['Cache-Control'] = "max-age=7200"
    return response

在模型中:

def get_image_path(self):
    # This returns the url of serve_image, with the argument of image's pk.
    # Something like /main/serve_image/1231234dfg22; this url will return a
    # response image with the blob
    return reverse("main.views.serve_image", args=[str(self.pk)])

而只是使用{{ model.get_image_path }}而不是.

(这是django-nonrel,但我想你可以弄明白它的作用)

此外,有一个帖子在这里关于这一点; 你应该检查一下.