将图像从Jersey REST服务返回到浏览器与使用servlet

Question

I am curious to know what is the best way to return image (*.jpg or *.gif) to the client browser:

• The first idea came up in my mind is to use the good old servlet.
• Or I can use JAX-RS (Jersy) rest service as well.

I need to create some methods for different size of images like

• thumbnails size
• small size
• normal size
• original size
• custom size

If I use servlet then I can create one servlet per image size and an extra one for custom size where I can send the desired W and H values as a URL parameters to the servlet.

If I use REST the I can create a class with methods and for the custom size I can use Path parameters.

But what about the performance? Which solution is better and why?

Answer 1

I think both solutions are equivalent in terms of performance. However, IMHO, JAX-RS is different from Servlet because it is declarative whereas the latter is procedural.

I would go for one endpoint only with a @QueryParam instead of a @PathParam . The size of the image is more an attribute of it than a subresource as I think you said in your question.

With this solution (that I've already implemented once) you've got only one method with annotations that make it really easy to read. For example:

@Path("images")
public interface ImageResource {
    enum Size {
        thumbnail, small, normal, original, custom
    }

    @GET
    @Path("/{id}")
    @Produces("image/jpeg")
    byte[] getImage(@PathParam("id") long id, @QueryParam("size") @DefaultValue("thumbnail") Size size, @QueryParam("width") Integer width, @QueryParam("height") Integer height);
}

Then if size == Size.custom check that both width and height are not null.