Loading a specific image using servlets

Question

Hello,
I have a question regarding a servlet and my HTML. In my HTML page I should load/ reaload some GIF images that are being dynamically created on the serves: drawn with Java 2 D and afterwards GIF encoded. response.setContentType("image/gif");
GifEncoder encoder = new GifEncoder(img, out);
in the servlet GraphicServlet.java, for example.
In my HTML page I want to load this image that is being formed on the server. Here's that piece of code:
<td><A HREF="http://localhost:8080/servlet/mypackage.myServlet?Nothing! onMouseover="ddrivetip('Click to draw a selected shape', 'yellow', 250)";
onMouseout="hideddrivetip()">
<img WIDTH=375 HEIGHT=250 BORDER=0 src="<%
if (request.getParameter("string")!=null)
out.print((String)request.getParameter("string"));
else
out.print("http://localhost:8080/servlet/mypackage.GraficServlet?undo");
%>" ISMAP/></a></td>
The thing is that I want to load in HTML page in a table the image splitted on the the server. Every cell of the table is a part of the image. My question is how I can do that? Assign an id to every part and load that? What parameted should I pass between the HTML page and the server in order to be able to do that? How can I do in order to be able to reload in the browser only that piece of image that suffered modifications?
Thank you in advance.
Dani

Answer 1

Hello,
I will try to explain in a better way.
At the present moment the application behaves as it follows:
1.The Server creates the image and encodes it into GIF
2. Html displays this image as a server side image map
3. The image is dynamically umpated in the browser, being modified by user interactions, and modifications are sent to the server
4. On the server I am splitting this image in subimages (for example, a grid of 4 equal tiles)
What I'm indending to do is:
1. What I am trying to do is display in a table in the browser the subimages, each cell holding one part of the entire image, and I don't know what parameter I should use and how, as a selection of the sub-image.
Here's the fragment where I am loading the entire image in the browser. I don't know how I should modify that in order to be able to load the certain parts on the original images in a table, in my HTML page.
<td><img WIDTH=375 HEIGHT=250 BORDER=0 src="<%
if (request.getParameter("string")!=null)
out.print((String)request.getParameter("string"));
else
out.print("http://localhost:8080/servlet/mypackage.GraficServlet?undo");
%>" ISMAP/></td>
Thank you, once again.