The original message was received at 2010-01-13 07:16:01 -0800
from postoffice.(null) [10.0.0.1]
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<[email protected]>
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... while talking to postoffice.(null).:
>>> RCPT To:<[email protected]>
<<< 550 5.1.1 unknown or illegal alias: [email protected]
550 <[email protected]>... User unknown
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Reporting-MTA: dns; postoffice.(null)
Received-From-MTA: DNS; postoffice.(null)
Arrival-Date: 2010-01-13 07:16:01 -0800
Final-Recipient: RFC822; [email protected]
Action: failed
Status: 5.1.1
Remote-MTA: DNS; postoffice.(null)
Diagnostic-Code: SMTP;550 5.1.1 unknown or illegal alias: [email protected]
Last-Attempt-Date: 2010-01-13 07:16:01 -0800
--- Begin Message ---
=============================================================================
Today's Topic Summary
=============================================================================
Group: [email protected]
Url: http://groups.google.com/group/google-web-toolkit/topics
- Image Generation [1 Update]
http://groups.google.com/group/google-web-toolkit/t/6e2e50c917cda57a
=============================================================================
Topic: Image Generation
Url: http://groups.google.com/group/google-web-toolkit/t/6e2e50c917cda57a
=============================================================================
---------- 1 of 1 ----------
From: bryanb <[email protected]>
Date: Nov 21 11:58PM -0800
Url: http://groups.google.com/group/google-web-toolkit/msg/b4ca77b978533941
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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