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Thumbnail

Stephen Justus
Greenhorn

Joined: Jul 20, 2004
Posts: 2
I need some help.
I am using Tomcat version 4.1.24, jdk1.4.1_05, and Windows.
The source below works fine but when I try to use it on Tomcat version 4.1.27, jdk1.4.1_05, and Linux it doesnt work.
Any ideas why?

package common;

import com.sun.image.codec.jpeg.*;
import java.awt.*;
import javax.swing.ImageIcon;
import java.awt.image.*;
import java.io.*;

public class Thumbnail extends BaseServlet{
public static void main(String[] args) throws Exception {
try {
// load image from INFILE
Image image = Toolkit.getDefaultToolkit().getImage(args[0]);

MediaTracker mediaTracker = new MediaTracker(new Container());
mediaTracker.addImage(image, 0);
mediaTracker.waitForID(0);
// determine thumbnail size from WIDTH and HEIGHT
int thumbWidth = Integer.parseInt(args[2]);
int thumbHeight = Integer.parseInt(args[3]);
double thumbRatio = (double)thumbWidth / (double)thumbHeight;
int imageWidth = image.getWidth(null);
int imageHeight = image.getHeight(null);
double imageRatio = (double)imageWidth / (double)imageHeight;
if (thumbRatio < imageRatio) {
thumbHeight = (int)(thumbWidth / imageRatio);
} else {
thumbWidth = (int)(thumbHeight * imageRatio);
}
// draw original image to thumbnail image object and
// scale it to the new size on-the-fly
BufferedImage thumbImage = new BufferedImage(thumbWidth,
thumbHeight, BufferedImage.TYPE_INT_RGB);
Graphics2D graphics2D = thumbImage.createGraphics();
graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BILINEAR);
graphics2D.drawImage(image, 0, 0, thumbWidth, thumbHeight, null);
// save thumbnail image to OUTFILE
BufferedOutputStream out = new BufferedOutputStream(new
FileOutputStream(args[1]));
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param = encoder.
getDefaultJPEGEncodeParam(thumbImage);
int quality = Integer.parseInt(args[4]);
quality = Math.max(0, Math.min(quality, 100));
param.setQuality((float)quality / 100.0f, false);
encoder.setJPEGEncodeParam(param);
encoder.encode(thumbImage);
} catch(Exception e) {
System.out.println("failed");
}
}
}
Mag Hoehme
Ranch Hand

Joined: Apr 07, 2002
Posts: 194
Hi Stephen,

how do you know that it does not work? Does the piece of code throw any exceptions (if yes, which one)?

I suggest that you change the catch clause and replace it by something like

The stack trace may tell you what exactly is going wrong.


Mag
pascal betz
Ranch Hand

Joined: Jun 19, 2001
Posts: 547
perhaps you get some problems with the file permissions ?

pascal
Mark Stein
Ranch Hand

Joined: May 20, 2002
Posts: 75
Is the linux box running headless? And if so, is it configured to handle java graphics? Java needs a video card, or proper configuration to run graphics.
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: Thumbnail
 
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