Hi,
I have a problem with displaying tiff data in PDF
format using FOP. We have binary data in tiff stored
in database. What I need to do is to write a servlet
to get those binary data in tiff format from database
and put those data in a byte array. Next, in the same
servlet, I need to get those binary data in tiff
format from the byte array and display them on the web
in PDF format using FOP. I know if the binary data is
formatted object, it is easy to convert it into PDF
using FOP. However, the data in the byte array "bt" in
tiff does not belong to the standard formatting
object.
My understanding is I need to either convert
it into the formatting object using XSL or convert it
into XML. However, I am new to FOP and XML/XSL and do
not know how to do that. If possible, we need to
convert the data format in memory,that means,
everything is done in memory, not save it as a file
first and process using FOP. Anyone has the
experience and would like to share the knowledge and
experience with me, I will greatly appreciate. If you
have a piece of codes for me to share, that will be
greatly helpful.
I also attached my piece of codes for your reference.
I know my code is not working, because I tried to
convert non-standard formatting object to PDF. I need
to do something about this part. Please help me.
Thanks in advance,
Jerry
***********************************************************
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.util.zip.*;
import java.sql.*;
import java.text.*;
import java.net.*;
import java.util.Properties;
import java.awt.image.*;
import com.sun.media.jai.codec.*;
import com.sun.media.jai.*;
import javax.media.jai.JAI;
import javax.media.jai.*;
import javax.media.jai.RenderedOp;
import javax.media.jai.PlanarImage;
import javax.media.jai.OpImage;
import javax.media.jai.util.*;
import
javax.media.jai.remote.SerializableRenderedImage;
import java.awt.image.renderable.ParameterBlock;
import java.lang.Object;
import java.awt.Image;
import javax.swing.ImageIcon;
import java.io.ByteArrayOutputStream.*;
import com.csi.utils.StringUtils;
import com.csi.daserver.global.*;
import com.csi.dcserver.objects.DCSession;
import com.csi.dcserver.exceptions.*;
import com.csi.daserver.utils.MsgPool;
import com.csi.dcserver.crypto.Crypto;
import org.xml.sax.InputSource;
import org.apache.fop.apps.Driver;
import org.apache.fop.apps.XSLTInputHandler;
import org.apache.fop.messaging.MessageHandler;
import
org.apache.avalon.framework.logger.ConsoleLogger;
import org.apache.avalon.framework.logger.Logger;
public class ImageDownload extends HttpServlet {
Logger log = null;
....
public void doGet(HttpServletRequest req,
HttpServletResponse resp) throws ServletException,
IOException {
...
//got the binary data in tiff format from database
and put the binary data in byte array bt
Byte[] bt = (byte[]) v.elementAt(0);
sendPDFBinaryResponse(resp, req, bt,
"application/pdf");
return;
}
}
//
private void
sendPDFBinaryResponse(HttpServletResponse
res,HttpServletRequest req, byte[]
bt,StringsContTypeHeader) throws IOException,
ServletException{
if(sContTypeHeader=="application/pdf"){
if (log == null) {
log = new
ConsoleLogger(ConsoleLogger.LEVEL_WARN);
MessageHandler.setScreenLogger(log);
}
renderFO(new InputSource(new
ByteArrayInputStream(bt)), res);
}
}
public void renderFO(InputSource foFile,
HttpServletResponse response) throws ServletException
{
try {
ByteArrayOutputStream out = new
ByteArrayOutputStream();
response.setContentType("application/pdf");
Driver driver = new Driver(foFile, out);
driver.setLogger(log);
driver.setRenderer(Driver.RENDER_PDF);
driver.run();
byte[] content = out.toByteArray();
response.setContentLength(content.length);
response.getOutputStream().write(content);
response.getOutputStream().flush();
} catch (Exception ex) {
throw new ServletException(ex);
}
}
...
}
****************
This is the exact error I got:
org.xml.sax.SAXParseException: Content is not allowed
in prolog.
at
org.apache.xerces.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1172)
at org.apache.fop.apps.Driver.render(Driver.java:498)
at org.apache.fop.apps.Driver.run(Driver.java:565)
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