Question

对不起，我是PDF新手，并正在寻找如何使用书签名称获取特定pdf页面的解决方案？像下面的代码片段我试图循环所有页面但坚持将书签与我需要的页面链接。任何人都可以帮忙吗？

import java.awt.print.PrinterException;
import java.io.File;
import java.io.IOException;
import org.apache.pdfbox.cos.COSObject;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.encryption.InvalidPasswordException;
import org.apache.pdfbox.pdmodel.interactive.documentnavigation.destination.PDPageFitWidthDestination;
import org.apache.pdfbox.pdmodel.interactive.documentnavigation.outline.PDDocumentOutline;
import org.apache.pdfbox.pdmodel.interactive.documentnavigation.outline.PDOutlineItem;
import org.apache.pdfbox.pdmodel.interactive.documentnavigation.outline.PDOutlineNode;

public class PDFLoader {

    public static void main(String[] args) throws InvalidPasswordException, IOException, PrinterException {


          File file = new File("d:\\pdf\\sample.pdf"); 
          PDDocument document = PDDocument.load(file); 
          PDPage page01 = document.getDocumentCatalog().getPages().get(0);
          PDPage page02 = document.getDocumentCatalog().getPages().get(1);

          PDDocumentOutline outline =  document.getDocumentCatalog().getDocumentOutline();
          printBookmark(outline, "");
          PDDocument doc = new PDDocument();
          doc.addPage(page01);
          doc.addPage(page02);
          doc.save("d:\\pdf\\newSample.pdf");
          doc.close();

    }



public static PDPage getBookmark(PDOutlineNode bookmark, String indentation) throws IOException
    {
        PDOutlineItem current = bookmark.getFirstChild();
        while (current != null)

        {
            System.out.println(indentation + current.getTitle());



            if (current.getAction() instanceof PDActionGoTo)
            {
                PDActionGoTo gta = (PDActionGoTo) current.getAction();
                if (gta.getDestination() instanceof PDPageDestination)
                {

                    if(current.getTitle().equals("MyBookMark")){


                        PDPageDestination pd = (PDPageDestination) current.getDestination();
                        System.out.println("Destination page: " + pd.retrievePageNumber());
                        return pd.getPage();

                        }
                }
            }

            getBookmark(current, indentation + "    ");
            current = current.getNextSibling();

            }


        return null;
    }







//Stack Trace
    Exception in thread "main" java.lang.NullPointerException
    at com.mypackage.PDFLoader.getBookmark(PDFLoader.java:67)
    at com.mypackage.PDFLoader.main(PDFLoader.java:40)

Answer 1

事实证明，在您的PDF中，页面目的地不在书签的目的地条目中，而是在书签的操作条目中（是的，PDF使得有两种方法可以做同样的事情）。将其添加到您的代码中：

if (current.getDestination() instanceof PDPageDestination)
{
    PDPageDestination pd = (PDPageDestination) current.getDestination();
    System.out.println("Destination page: " + (pd.retrievePageNumber() + 1));
    return pd.getPage();
}
if (current.getAction() instanceof PDActionGoTo)
{
    PDActionGoTo gta = (PDActionGoTo) current.getAction();
    if (gta.getDestination() instanceof PDPageDestination)
    {
        PDPageDestination pd = (PDPageDestination) gta.getDestination();
        System.out.println("Destination page: " + (pd.retrievePageNumber() + 1));
        return pd.getPage();
    }
}

如何在pdf框中使用书签选择pdf页面？

1 个答案: