questions.importpages.ConcatenateWithTOC.java Source code

Introduction

Here is the source code for questions.importpages.ConcatenateWithTOC.java

Source

/*
 * This example was written by Bruno Lowagie, author of the book
 * 'iText in Action' by Manning Publications (ISBN: 1932394796).
 * You can use this example as inspiration for your own applications.
 * The following license applies:
 * http://www.1t3xt.com/about/copyright/index.php?page=MIT
 */

package questions.importpages;

import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;
import com.lowagie.text.Element;
import com.lowagie.text.Paragraph;
import com.lowagie.text.pdf.BaseFont;
import com.lowagie.text.pdf.PdfAction;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfCopy;
import com.lowagie.text.pdf.PdfDestination;
import com.lowagie.text.pdf.PdfImportedPage;
import com.lowagie.text.pdf.PdfOutline;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfWriter;
import com.lowagie.text.pdf.PdfCopy.PageStamp;

public class ConcatenateWithTOC {

    public static final String[] TEST = { "results/questions/importpages/helloworld.pdf",
            "results/questions/importpages/hellosun.pdf", "results/questions/importpages/hellomoon.pdf" };
    public static final String RESULT = "results/questions/importpages/concatenated_with_toc.pdf";

    public static void main(String[] args) {
        try {
            // suppose we have some TEST PDF files
            for (int i = 0; i < TEST.length; i++) {
                createTestPdf(i);
            }
            // and we want to concatenate them
            Document document = new Document();
            PdfCopy copy = new PdfCopy(document, new FileOutputStream(RESULT));
            copy.setViewerPreferences(PdfWriter.PageModeUseOutlines);
            document.open();
            // but we want to create an outline tree
            PdfOutline root = copy.getRootOutline();
            // we also want an extra page with the file name
            Document coverpage;
            ByteArrayOutputStream baos;
            PdfReader reader;
            // we want to add page numbers too
            int pagenumber = 0;
            BaseFont bf = BaseFont.createFont();
            for (int i = 0; i < TEST.length; i++) {
                // we create the coverpage in memory
                coverpage = new Document();
                baos = new ByteArrayOutputStream();
                PdfWriter.getInstance(coverpage, baos);
                coverpage.open();
                coverpage.add(new Paragraph("file: " + TEST[i]));
                coverpage.close();
                // we import that page
                reader = new PdfReader(baos.toByteArray());
                pagenumber++;
                copy.addPage(getStampedPage(reader, copy, 1, pagenumber, bf));
                // we create the bookmark to that page
                PdfDestination dest = new PdfDestination(PdfDestination.FIT);
                new PdfOutline(root, PdfAction.gotoLocalPage(pagenumber, dest, copy), TEST[i]);
                // we import the document itself
                reader = new PdfReader(TEST[i]);
                for (int j = 1; j <= reader.getNumberOfPages(); j++) {
                    pagenumber++;
                    copy.addPage(getStampedPage(reader, copy, j, pagenumber, bf));
                }
            }
            document.close();
        } catch (IOException ioe) {
            ioe.printStackTrace();
        } catch (DocumentException de) {
            de.printStackTrace();
        }
    }

    public static PdfImportedPage getStampedPage(PdfReader reader, PdfCopy copy, int oldP, int newP, BaseFont bf)
            throws IOException {
        PdfImportedPage page = copy.getImportedPage(reader, oldP);
        PageStamp pagestamp = copy.createPageStamp(page);
        PdfContentByte canvas = pagestamp.getOverContent();
        canvas.beginText();
        canvas.setFontAndSize(bf, 12);
        canvas.showTextAligned(Element.ALIGN_LEFT, "page " + newP, 36, 26, 0);
        canvas.endText();
        pagestamp.alterContents();
        return page;
    }

    public static void createTestPdf(int i) throws IOException, DocumentException {
        Document document = new Document();
        PdfWriter.getInstance(document, new FileOutputStream(TEST[i]));
        document.open();
        switch (i) {
        case 1:
            document.add(new Paragraph("Hello Sun"));
            break;
        case 2:
            document.add(new Paragraph("Hello Moon"));
            break;
        default:
            document.add(new Paragraph("Hello World"));
        }
        document.close();
    }
}