Pass dynamic image to JSP with servlet

Question

I have a desktop app that creates a graphics 2D object, sticks it in a panel and draws it. I am trying to convert this app to a webpage using servlets and jsps. I have been read

Answer 1

I'll just answer on the first part of the question. To embed an image into an HTML page, you first need to generate the HTML page which will contain the following markup:

This HTML markup will be sent in the response to the request, and the browser will parse it. It will then send a second HTTP request to somePath, to download the bytes of the image.

So, you need to somehow store the generated image in memory and wait for the second request, and then send the bytes to the response, or you need to delay the image generation until the second request comes in. I much prefer the second solution. So the goal of the code handling the first request will just be to generate markup containing an img tag pointing to an appropriate URL. This URL should contain all the parameters necessary to actually generate the image.

For the second part, you will certainly have to create a BufferedImage instance, draw to its Graphics2D object, and use ImageIO to write this BufferedImage to the response output stream.