HI,
Tried the same but it was not working...
it gives me an blank image... Please help me out...
try {
java.awt.Image image = rr.toImage();// An image given by the
service
MediaTracker mediaTracker = new MediaTracker(new
Container());
mediaTracker.addImage(image, 0);
mediaTracker.waitForID(0);
BufferedImage bImage = new BufferedImage(698,
440, BufferedImage.TYPE_INT_RGB);
Graphics2D graphics2D = bImage.createGraphics();
graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BILINEAR);
graphics2D.drawImage(image, 0, 0, (int) 698, (int)
440, null);
graphics2D.dispose();
ImageIO.write(bImage, "gif", res.getOutputStream());
} catch (Exception e) {
e.printStackTrace();
}
Here rr is an external service object which gives me an image...
At the client side i have called this servlet...
Regards,
Naveen
On Sun, Nov 22, 2009 at 1:28 PM, bryanb <[email protected]> wrote:
> Something like this works for me.
>
> On the server:
>
> import java.awt.Container;
> import java.awt.Graphics2D;
> import java.awt.MediaTracker;
> import java.awt.RenderingHints;
> import java.awt.Toolkit;
> import java.awt.image.BufferedImage;
>
> import javax.imageio.ImageIO;
> import javax.servlet.http.HttpServlet;
> import javax.servlet.http.HttpServletRequest;
> import javax.servlet.http.HttpServletResponse;
>
> public class ImageServlet extends HttpServlet {
> /**
> *
> */
> private static final long serialVersionUID = 1L;
>
> public void doGet(HttpServletRequest request, HttpServletResponse
> response) {
> double thumbWidth;
> double thumbHeight;
>
> String imagefile = request.getParameter("file");
> String height = request.getParameter("h");
> String width = request.getParameter("w");
>
> // System.err.println(imagefile + ", " + height + ", " +
> width);
>
> // Set the mime type of the image
> response.setContentType("image/png");
>
> try {
>
> java.awt.Image image =
> Toolkit.getDefaultToolkit().getImage
> (imagefile);
> MediaTracker mediaTracker = new MediaTracker(new
> Container());
> mediaTracker.addImage(image, 0);
> mediaTracker.waitForID(0);
>
> int imageWidth = image.getWidth(null);
> int imageHeight = image.getHeight(null);
> double imageRatio = (double) imageWidth / (double)
> imageHeight;
>
> // if width parameter is null, then just use it to
> scale
> thumbHeight = new Double(height);
>
> if (width != null) {
> thumbWidth = new Double(width);
> // determine size from WIDTH and HEIGHT
> double thumbRatio = thumbWidth /
> thumbHeight;
>
> if (thumbRatio < imageRatio) {
> thumbHeight = thumbWidth /
> imageRatio;
> } else {
> thumbWidth = thumbHeight *
> imageRatio;
> }
> } else {
> thumbWidth = thumbHeight * imageRatio;
> }
>
> // draw original image to thumbnail image object and
> scale it to
> the new size on-the-fly
> BufferedImage thumbImage = new BufferedImage((int)
> thumbWidth,
> (int) thumbHeight, BufferedImage.TYPE_INT_RGB);
> Graphics2D graphics2D = thumbImage.createGraphics();
>
> graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
> RenderingHints.VALUE_INTERPOLATION_BILINEAR);
> graphics2D.drawImage(image, 0, 0, (int) thumbWidth,
> (int)
> thumbHeight, null);
> graphics2D.dispose();
>
> ImageIO.write(thumbImage, "png",
> response.getOutputStream());
> } catch (Exception e) {
> e.printStackTrace();
>
> }
> }
> }
>
>
> On the client, create a URL to get the image something like this:
>
> StringBuffer sb = new StringBuffer(GWT.getHostPageBaseURL());
> sb.append("ImageServlet?file=");
> sb.append(imagefilel);
> sb.append("&h=" + Utils.getPageHeight());
> sb.append("&w=" + Utils.getPageWidth());
> Image image = new Image(sb.toString);
>
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