How to cache image downloaded from URL in Java? - java

I have downloaded an image from a URL using ImageIO.write, so now I am wondering if there was a possibility of somehow caching that image. Is there a possibility to compare the downloaded image with the URL it's downloaded from to know that the image is from that URL? I need this because if I download an image and than later call that same URL for downloading, my app can recognize that it already has the image downloaded, so it doesn't download it again.

You should try to see if you can integrate the code to upload the picture to google and search by image. Or, you can also save the url of the image with an array while storing the image if you have multiple images you want to download at once.

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retrieve the URL images from SQlite

When retrieve the images from Firebase to SQlite it comes as link, so I am trying now to show the images through Picasso as the following:
Picasso.with(context).load(favoritesList.get(position).getFoodImage())
.into(viewHolder.food_image);
but the image not showing. How can I do it?
The first check value of this favoritesList.get(position).getFoodImage(), if not null, paste url to browser and see result. Check your image in xml file and maybe Picasso library error, because in one of my project, Picasso not working but when I using Glide, it's work fine, and i don't understand why :D. BTW you should set placeholder for image.

Upload images without convert to string

I need to upload images and i want to show all of images in another page. I have tried to use volley, but it need to encode and decode to show all images. It made my application not responding when i decode all the string of images.
My questions are:
Are there any ways to upload images beside volley?
Are there any ways to upload images using volley without convert them to string (encode)?
Thanks
I implemented it once by positing multi part file using HttpUrlConnection.
Basically you provide the image file input stream, the desired file name and the file's MIME type.
You can access the source code through this link:
https://github.com/MinaSamy/DailySelfie/blob/master/app/src/main/java/bloodstone/dailyselfie/android/utils/PostMultiPart.java

Get bitmap of the image from browsers

I am trying to get the bitmap of the image which i am viewing in browser. is it possible to get those bitmap values from any of contentProvider. Pl suggest me how to do this. Thanks in advance.
You can use a crawler to get the web-page contents, like Jsoup, then find the image url & either download its bitmap with Glide library or directly load it into a ImageView (using Glide again).

Image resize using app engine java

I want to read a image and re size it using App Engine java.
i am not able to find how to read image from a location and save it in app engine.
can any one help????
You can store uploaded image to blobstore. Read following document to know how to use blobstore.
https://developers.google.com/appengine/docs/java/blobstore/overview
Then you can use image service to scale image:
https://developers.google.com/appengine/docs/java/images/overview

Java Appengine: How to store a transformed image back to blobstore

I'm able to
-Upload an image to the blobstore
-Transform this image (in my case rescale it)
But I don't seem to be able to find out how I can store the transformed image back to Blobstore.
Any ideas?
BR,
As far as I know, this is currently only an experimental feature. You can create a "file" using createNewBlobFile.
Get more information here: Writing Files to the Blobstore (Experimental).

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