Hi,
I am currently working on a
project which convert binary data in tiff format into
PDF format. I refer to the example(FopServlet.java)
and always got error "Error 500: Content is
not allowed in prolog. ". I could not figure out what
the problem is. I was stuch by this. Please help me.
Here is the peice of codes. Would you please take a
look and give me a suggestion. I will greatly
appreciate it.
BTW, the binary data format from database which will
be displayed on the web is in tiff format, not a
formatting object. If it can be displayed directly on
the web in pdf format, it is not necessary to convert
it into pdf first.
thanks,
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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