Programmatically Reducing JPEG file size

Question

Apologies for any ignorance, but I have never worked with jpeg images (let alone any types of images) in Java before.

Supposing I want to send a jpeg image from a we

Answer 1

The easiest way to do this is to decompress the byte stream into a Java Image, optionally resize it (which makes it smaller) and then regenerate a JPEG image from this with the desired quality setting.

This new image is then what is sent to the client.