Retrieve an image from RESTlet API

Question

I am creating a REST API in JAVA using RESTlet 2.0. I want to create an API call that will return an image from the database in a similar way as Facebook is doing in its Graph API.

Basically, I will do a GET to e.g.

    http://localhost:8080/myAPI/{session_id}/img/p?id=1

This will then retrieve the blob data from the DB and then return the image in such a way that the user can display it like this:

    <img src="http://localhost:8080/myAPI/{session_id}/img/p?id=1">

I know that I will probably need to set the content-type in the header to Image/PNG (assuming the image is a PNG of course), but what I'm struggling with is returning the data correctly for this to work.

Any suggestions?

Thanks!

Answer 1

not sure about 2.0, however in 2.2 you could use something like this:

@Get
public Representation getImage() {

    ...
    byte[] data = ...

    ObjectRepresentation<byte[]> or=new ObjectRepresentation<byte[]>(data, MediaType.IMAGE_PNG) {
        @Override
        public void write(OutputStream os) throws IOException {
            super.write(os);
            os.write(this.getObject());
        }
    };

    return or; 
}

Answer 2

Using 2.2 there is a ByteArrayRepresentation type.

@Get("image/jpeg")
public void getIcon() {
    byte[ ] your_images_bytes = ...
    ByteArrayRepresentation bar 
        = new ByteArrayRepresentation(your_images_bytes, MediaType.IMAGE_JPEG) ;
    getResponse().setEntity(bar);
}

Answer 3

In my App I am returning a byte array from my REST method. and the content-type is image/png as you have mentioned.