[Solved] Splitting a PDF

[dranakan]

Hello,

I have an action which get a PDF and splitt it. For example, one PDF with 100 pages gives 100 documents to add in Alfresco. All works well. My problem is after splitting, PDFBox is not able to read the new PDF (but if I use Acrobat, all is ok).

The tools :
  Splitting : iText
  ReadContent of PDF : PDFBox (get the content of the PDF in a  String)


Has someone the same problem ? I don't know where is the problem. I have post on the iText mailling and waiting the response…

:arrow: There is a sample which reproduces the bug:

There is an application reproducing the problem… I hope that someone could find the source of the problem. This arrived with different PDF source (printed with pdfFractory, OpenOffice, …) for the original PDF (will be PDF_A).
To use this application, just place a PDF named "PDF_A.pdf" at the base of the project. Need library PDFBox and iText.

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import org.pdfbox.cos.COSDocument;
import org.pdfbox.pdfparser.PDFParser;
import org.pdfbox.pdmodel.PDDocument;
import org.pdfbox.util.PDFTextStripper;

import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfImportedPage;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfWriter;

/**
 * Problem using iText or PDFBox.
 * http://article.gmane.org/gmane.comp.java.lib.itext.general/46543
 */
public class TestReuseSameFile {

    /**
     * <at> param args
     */
    public static void main(String[] args) {
        System.out
                .println("The problem is that after the creation of two files,"
                        + " the last is unreadable and I don't know what I do wrong…"
                        + " For my tests, I take one PDF (PDF_A) from 1 page, and I "
                        + "create the PDF_B. After I take PDF_B to create PDF_C and "
                        + "there PDF_C is unreadable (with Code using PDFBox, but I can open"
                        + " and read it by the OS system). Test with IText 2.1.4 and 2.1.7."
                        + " \n !!! USAGE : put the file : PDF_A.pdf at the base of the project.");
        TestReuseSameFile reuse = new TestReuseSameFile();

        // Put the original PDF at the base of the project.
        String PDF_A = "PDF_A.pdf";
        System.out.println("————— " + PDF_A + "\n"
                + reuse.pdftoText(PDF_A));

        // Creation of PDF_B base on PDF_A
        String PDF_B = "PDF_B.pdf";
        reuse.splittPDF(PDF_A, PDF_B);
        System.out.println("————— " + PDF_B + "\n"
                + reuse.pdftoText(PDF_B));

        // Creation of PDF_C base on PDF_B
        String PDF_C = "PDF_C.pdf";
        reuse.splittPDF(PDF_B, PDF_C);
        System.out.println("————— " + PDF_C + "\n"
                + reuse.pdftoText(PDF_C));

        // There is bug because PDF_C has no content…. :(

    }

    /**
     * Take the file (just the first page) and recreate another (same content).
     * Test with iText 2.1.4 and 2.1.7.
     *
     * <at> param fileName Source
     * <at> param nameOfNewFile Destination
     * <at> return
     */
    public boolean splittPDF(String fileName, String nameOfNewFile) {

        try {
            PdfReader reader = new PdfReader(fileName);

            com.lowagie.text.Document document = new com.lowagie.text.Document(
                    reader.getPageSizeWithRotation(1));
            PdfWriter writer;
            try {
                File f = new File(nameOfNewFile);
                if (f.exists()) {
                    System.out.println("The file : " + nameOfNewFile
                            + " already exist. It will be overwrite");
                }
                writer = PdfWriter.getInstance(document, new FileOutputStream(
                        nameOfNewFile));
            } catch (Exception e) {
                System.out.println(e);
                return false;
            }
            document.open();
            PdfContentByte cb = writer.getDirectContent();
            PdfImportedPage page;
            int rotation;
            int pageNumber = 1;

            document.setPageSize(reader.getPageSizeWithRotation(pageNumber));
            document.newPage();
            page = writer.getImportedPage(reader, pageNumber);
            rotation = reader.getPageRotation(pageNumber);
            if (rotation == 90 || rotation == 270) {
                cb.addTemplate(page, 0, -1f, 1f, 0, 0, reader
                        .getPageSizeWithRotation(pageNumber).getHeight());
            } else {
                cb.addTemplate(page, 1f, 0, 0, 1f, 0, 0);
            }

            document.close();

        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }

        return true;
    }

    /**
     * Get content of PDF in String (Use PDFBOX (tested with PDFBox-0.7.3)
     *
     * <at> param fileName
     *            the PDF File name
     * <at> return Content of PDF
     */
    public String pdftoText(String fileName) {

        File f = new File(fileName);
        if (!f.isFile()) {
            System.out.println("File " + fileName + " does not exist.");
            return null;
        }
        PDFParser parser;
        PDFTextStripper pdfStripper;
        PDDocument pdDoc = null;
        COSDocument cosDoc = null;

        try {
            parser = new PDFParser(new FileInputStream(f));
        } catch (Exception e) {
            System.out.println("Unable to open PDF Parser.");
            return null;
        }
        try {
            parser.parse();
            cosDoc = parser.getDocument();
            pdfStripper = new PDFTextStripper();
            pdDoc = new PDDocument(cosDoc);
            int numberOfPage = pdDoc.getNumberOfPages();
            // Get Content JUST ONE PAGE FOR THE EXEMPLE
            for (int i = 1; i <= numberOfPage; i++) {
                pdfStripper.setStartPage(i);
                pdfStripper.setEndPage(i);
                String out = pdfStripper.getText(pdDoc);
                return out;
            }
        } catch (Exception e) {
            System.err
                    .println("An exception occured in parsing the PDF Document.");
            e.printStackTrace();
        } finally {
            try {
                if (cosDoc != null)
                    cosDoc.close();

                if (pdDoc != null)
                    pdDoc.close();
            } catch (Exception e1) {
                e1.printStackTrace();
            }
        }
        return null;
    }
}
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Thanks !

[dranakan]

Hello,

Nobody uses the splitting of PDF ?

[dranakan]

It's ok when the splitting is done like this :
(need IText)

import com.lowagie.text.pdf.*;
…
String fileNameSourcePDF="pdfSource.pdf";
String nameOfNewFile = "newPDFSplitted.pdf";

PdfReader reader = new PdfReader(fileNameSourcePDF);
PdfStamper stamper = new PdfStamper(reader,new FileOutputStream(nameOfNewFile));
reader.selectPages(1+ "-"+3);
stamper.close();
…
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