using JAI to create a thumbnail as a JPEG
I'm trying to use JAI to create a thumbnail of a JPEG and no matter
what I do, I keep getting the following stack trace:
exception
javax.servlet.ServletException: All factories fail for the operation
"encode"
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:
523)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:
421)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:
224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:
1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
javax.media.jai.util.ImagingException: All factories fail for the
operation "encode"
javax.media.jai.OperationRegistry.invokeFactory(OperationRegistry.java:
1687)
javax.media.jai.ThreadSafeOperationRegistry.invokeFactory(ThreadSafeOperationRegistry.java:
473)
javax.media.jai.registry.RIFRegistry.create(RIFRegistry.java:332)
javax.media.jai.RenderedOp.createInstance(RenderedOp.java:819)
javax.media.jai.RenderedOp.createRendering(RenderedOp.java:867)
javax.media.jai.RenderedOp.getRendering(RenderedOp.java:888)
javax.media.jai.JAI.createNS(JAI.java:1099)
javax.media.jai.JAI.create(JAI.java:973)
javax.media.jai.JAI.create(JAI.java:1395)
UploadAction.resizeImage(UploadAction.java:111)
UploadAction.execute(UploadAction.java:71)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:
419)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:
224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:
1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
java.io.IOException: reading encoded JPEG Stream
sun.awt.image.codec.JPEGImageEncoderImpl.writeJPEGStream(Native
Method)
sun.awt.image.codec.JPEGImageEncoderImpl.encode(JPEGImageEncoderImpl.java:
472)
sun.awt.image.codec.JPEGImageEncoderImpl.encode(JPEGImageEncoderImpl.java:
228)
com.sun.media.jai.codecimpl.JPEGImageEncoder.encode(JPEGImageEncoder.java:
277)
com.sun.media.jai.opimage.EncodeRIF.create(EncodeRIF.java:70)
sun.reflect.GeneratedMethodAccessor51.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
java.lang.reflect.Method.invoke(Method.java:585)
javax.media.jai.FactoryCache.invoke(FactoryCache.java:122)
javax.media.jai.OperationRegistry.invokeFactory(OperationRegistry.java:
1674)
javax.media.jai.ThreadSafeOperationRegistry.invokeFactory(ThreadSafeOperationRegistry.java:
473)
javax.media.jai.registry.RIFRegistry.create(RIFRegistry.java:332)
javax.media.jai.RenderedOp.createInstance(RenderedOp.java:819)
javax.media.jai.RenderedOp.createRendering(RenderedOp.java:867)
javax.media.jai.RenderedOp.getRendering(RenderedOp.java:888)
javax.media.jai.JAI.createNS(JAI.java:1099)
javax.media.jai.JAI.create(JAI.java:973)
javax.media.jai.JAI.create(JAI.java:1395)
UploadAction.resizeImage(UploadAction.java:111)
UploadAction.execute(UploadAction.java:71)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:
419)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:
224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:
1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
The code I'm using is cobbled together from several examples and
clearly I'm not doing something right. Here's what I've got so far:
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.awt.image.renderable.ParameterBlock;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.media.jai.Interpolation;
import javax.media.jai.JAI;
import javax.media.jai.OpImage;
import javax.media.jai.RenderedOp;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import com.sun.media.jai.codec.JPEGEncodeParam;
import com.sun.media.jai.codec.PNGEncodeParam;
import com.sun.media.jai.codec.SeekableStream;
public class UploadAction extends Action {
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) throws
IOException {
String basePath = "C:\\Program Files\\Apache Software Foundation\
\Tomcat 5.5\\webapps\\strutsTest\\";
UploadForm upload = (UploadForm) form;
if (upload.getFile() != null) {
/*
*
*
*
*
*
*/
// open input stream from uploaded file and copy into byte array
InputStream is = new
BufferedInputStream(upload.getFile().getInputStream());
ByteArrayOutputStream bos = new ByteArrayOutputStream();
int bytesRead = 0;
byte[] buffer = new byte[8192];
while ((bytesRead = is.read(buffer, 0, 8192)) != -1) {
bos.write(buffer, 0, bytesRead);
}
bos.close();
is.close();
byte[] image = bos.toByteArray();
// write original (unresized) file
OutputStream os = new BufferedOutputStream(new
FileOutputStream(basePath + upload.getFile().getFileName()));
ByteArrayInputStream bis = new ByteArrayInputStream(image);
bytesRead = 0;
buffer = new byte[8192];
while ((bytesRead = bis.read(buffer, 0, 8192)) != -1) {
os.write(buffer, 0, bytesRead);
}
os.close();
// resize image
bis.reset();
OutputStream osThumb = new BufferedOutputStream(new
FileOutputStream(basePath + "THUMB_" +
upload.getFile().getFileName()));
resizeImage(bis, os, 150, 150);
osThumb.close();
// close input stream
bis.close();
}
return mapping.findForward("success");
}
// based on code examples from http://www.i-proving.ca/space/Technologies/Java+Advanced+Imaging,
http://forums.java.net/jive/thread.jspa?messageID=64672 and
http://archives.java.sun.com/cgi-bin/wa?A2=ind0208&L=java-imageio-interest&P=242
private void resizeImage(InputStream is, OutputStream os, int width,
int height) {
// read in the original image from an input stream
SeekableStream s = SeekableStream.wrapInputStream(is, true);
RenderedOp image = JAI.create("stream", s);
((OpImage) image.getRendering()).setTileCache(null);
// now resize the image
double hRatio = ((double) height) / ((double) image.getHeight());
double wRatio = ((double) width) / ((double) image.getWidth());
double scale = Math.min(hRatio, wRatio);
ParameterBlock pb = new ParameterBlock();
pb.addSource(image).add(scale).add(scale);
pb.add(Interpolation.getInstance(Interpolation.INTERP_BICUBIC));
RenderingHints qualityHints = new
RenderingHints(RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_QUALITY);
RenderedOp resizedImage = JAI.create("SubsampleAverage", pb,
qualityHints);
// lastly, write the newly-resized image to an
// output stream, in a specific encoding
pb = new ParameterBlock();
BufferedImage bi = resizedImage.getAsBufferedImage();
pb.addSource(bi);
pb.add(os);
pb.add("jpeg");
JPEGEncodeParam ep = new JPEGEncodeParam();
ep.setQuality(0.75f);
pb.add(ep);
JAI.create("encode", pb);
}
}
Any suggestions? I'm baffled.
Thanks