PDF-Feld generieren von leeren Bilder durch JBIG2-Bilder sind

Werfen Sie einen Blick auf das ticket in PDFBox https://issues.apache.org/jira/browse/PDFBOX-1067 . Ich denke, die Antwort auf Ihre Frage ist:

1. um sicherzustellen, dass Sie haben JAI und JAI-ImageIO plugins installiert für Ihre Java-version: anständige Installations-Anweisungen sind hier verfügbar: http://docs.geoserver.org/latest/en/user/production/java.html
2. zu verwenden, die JBIG2-imageio plugin, (neuere Versionen sind lizenziert unter der Apache2 Lizenz) https://github.com/levigo/jbig2-imageio/

Installation der JAI scheint nicht erforderlich.
Ich brauchte nur zu downloaden levigo-jbig2-imageio-1.6.5.jar platzieren Sie es im Ordner von meinem dependency-jars und in eclipse hinzufügen, um den java build path-libraries.
https://github.com/levigo/jbig2-imageio/

import java.awt.image.BufferedImage
import org.apache.pdfbox.cos.COSName

import org.apache.pdfbox.pdmodel.PDDocument
import org.apache.pdfbox.pdmodel.PDPage
import org.apache.pdfbox.pdmodel.PDPageTree
import org.apache.pdfbox.pdmodel.PDResources
import org.apache.pdfbox.pdmodel.graphics.PDXObject
import org.apache.pdfbox.rendering.ImageType
import org.apache.pdfbox.rendering.PDFRenderer
import org.apache.pdfbox.tools.imageio.ImageIOUtil


import javax.imageio.ImageIO
import javax.imageio.spi.IIORegistry
import javax.imageio.spi.ImageReaderSpi
import javax.swing.*
import javax.swing.filechooser.FileNameExtensionFilter

public class savePDFAsImage{

    String path = "c:/pdfImage/"

    //allow pdf file selection for extracting
    public static File selectPDF() {
        File file = null
        JFileChooser chooser = new JFileChooser()
        FileNameExtensionFilter filter = new FileNameExtensionFilter("PDF", "pdf")
        chooser.setFileFilter(filter)
        chooser.setMultiSelectionEnabled(false)
        int returnVal = chooser.showOpenDialog(null)
        if (returnVal == JFileChooser.APPROVE_OPTION) {
            file = chooser.getSelectedFile()
           println "Please wait..."
        }
        return file
    }

    public static void main(String[] args) {
        try {
 //help to view list of plugin registered. check by adding JBig2 plugin and JAI plugin
            ImageIO.scanForPlugins()
            IIORegistry reg = IIORegistry.getDefaultInstance()
            Iterator spIt = reg.getServiceProviders(ImageReaderSpi.class, false)
            spIt.each(){
                println it.getProperties()
            }
            testPDFBoxSaveAsImage()
            testPDFBoxExtractImagesX()
        } catch (Exception e) {
            e.printStackTrace()
        }
    }    

    public static void testPDFBoxExtractImagesX() throws Exception {
        PDDocument document = PDDocument.load(selectPDF())
        PDPageTree list = document.getPages()
        for (PDPage page : list) {
            PDResources pdResources = page.getResources()
            for (COSName c : pdResources.getXObjectNames()) {
                PDXObject o = pdResources.getXObject(c)
                if (o instanceof org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject) {
                    File file = new File( + System.nanoTime() + ".png")
                    ImageIO.write(((org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject) o).getImage(), "png", file)
                }
            }
        }
        document.close()
        println "Extraction complete"
    }
    public static void testPDFBoxSaveAsImage() throws Exception {
        PDDocument document = PDDocument.load(selectPDF().getBytes())
        PDFRenderer pdfRenderer = new PDFRenderer(document)
        for (int page = 0; page < document.getNumberOfPages(); ++page) {
            BufferedImage bim = pdfRenderer.renderImageWithDPI(page,300, ImageType.BINARY)
            //suffix in filename will be used as the file format
            OutputStream fileOutputStream = new FileOutputStream(+ System.nanoTime() + ".png")
            boolean b = ImageIOUtil.writeImage(bim, "png",fileOutputStream,300)
        }
        document.close()
        println "Extraction complete"
    }
}