[英]PDF Box generating blank images due to JBIG2 Images in it
首先讓我概述一下我的項目。 我有一個pdf文件,我需要使用PDFBox
API轉換為圖像(一張圖像一張),然后使用PDFBox
API本身將所有這些圖像寫入新的pdf文件中。 基本上,將pdf轉換為pdf,我們稱為PDF轉碼。
對於某些包含JBIG2圖像的pdf, convertToImage()
方法的PDFbox實現會無提示地失敗,沒有任何異常或錯誤,最終生成PDF,但是這次僅包含空白內容(白色)。 我在控制台上收到的消息是:
Dec 06, 2013 5:15:42 PM org.apache.pdfbox.filter.JBIG2Filter decode
SEVERE: Can't find an ImageIO plugin to decode the JBIG2 encoded datastream.
Dec 06, 2013 5:15:42 PM org.apache.pdfbox.pdmodel.graphics.xobject.PDPixelMap getRGBImage
SEVERE: Something went wrong ... the pixelmap doesn't contain any data.
Dec 06, 2013 5:15:42 PM org.apache.pdfbox.util.operator.pagedrawer.Invoke process
WARNING: getRGBImage returned NULL
我需要知道如何解決此問題? 我們有類似的東西:
import org.apache.pdfbox.filter.JBIG2Filter;
我不知道如何實現。
我正在搜索,但無濟於事。 有人可以建議嗎?
在PDFBox https://issues.apache.org/jira/browse/PDFBOX-1067中查看此票證。 我認為您的問題的答案是:
我有同樣的問題。 我從jbig2-imageio下載了jar, 然后將其包含在項目的應用程序庫中,並且開箱即用。 正如亞當所說,它使用GPL3。
似乎不需要安裝JAI。 我只需要下載levigo-jbig2-imageio-1.6.5.jar,將其放置在我的依賴關系罐的文件夾中,然后在eclipse中將其添加到Java構建路徑庫中即可。 https://github.com/levigo/jbig2-imageio/
我遇到了同樣的問題,並通過在pom.xml中添加此依賴項來解決此問題:
<dependency>
<groupId>org.apache.pdfbox</groupId>
<artifactId>jbig2-imageio</artifactId>
<version>3.0.2</version>
</dependency>
祝好運。
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"
}
}
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