inspects a PDF file : Introduction « PDF


import java.io.FileOutputStream;

import java.io.PrintStream;

import java.util.Iterator;



import com.lowagie.text.pdf.PRStream;

import com.lowagie.text.pdf.PRTokeniser;

import com.lowagie.text.pdf.PdfArray;

import com.lowagie.text.pdf.PdfDictionary;

import com.lowagie.text.pdf.PdfIndirectReference;

import com.lowagie.text.pdf.PdfLister;

import com.lowagie.text.pdf.PdfName;

import com.lowagie.text.pdf.PdfObject;

import com.lowagie.text.pdf.PdfReader;



public class MainClass {

  public static void main(String[] args) throws Exception {

    PdfReader reader = new PdfReader("2.pdf");

    PrintStream list = new PrintStream(new FileOutputStream("2.txt"));

    PdfLister lister = new PdfLister(new PrintStream(list));

    PdfDictionary trailer = reader.getTrailer();

    lister.listDict(trailer);

    PdfIndirectReference info = (PdfIndirectReference) trailer.get(PdfName.INFO);

    lister.listAnyObject(info);

    lister.listAnyObject(reader.getPdfObject(info.getNumber()));

    PdfDictionary root = reader.getCatalog();

    lister.listDict(root);

    PdfDictionary outlines = (PdfDictionary) reader.getPdfObject(((PdfIndirectReference) root

        .get(PdfName.OUTLINES)).getNumber());

    lister.listDict(outlines);

    PdfObject first = reader.getPdfObject(((PdfIndirectReference) outlines.get(PdfName.FIRST))

        .getNumber());

    lister.listAnyObject(first);

    PdfDictionary pages = (PdfDictionary) reader.getPdfObject(((PdfIndirectReference) root

        .get(PdfName.PAGES)).getNumber());

    lister.listDict(pages);

    PdfArray kids = (PdfArray) pages.get(PdfName.KIDS);

    PdfIndirectReference kid_ref;

    PdfDictionary kid = null;

    for (Iterator i = kids.getArrayList().iterator(); i.hasNext();) {

      kid_ref = (PdfIndirectReference) i.next();

      kid = (PdfDictionary) reader.getPdfObject(kid_ref.getNumber());

      lister.listDict(kid);

    }

    PdfIndirectReference content_ref = (PdfIndirectReference) kid.get(PdfName.CONTENTS);

    PRStream content = (PRStream) reader.getPdfObject(content_ref.getNumber());

    lister.listDict(content);

    byte[] contentstream = PdfReader.getStreamBytes(content);

    list.println(new String(contentstream));

    PRTokeniser tokenizer = new PRTokeniser(contentstream);

    while (tokenizer.nextToken()) {

      if (tokenizer.getTokenType() == PRTokeniser.TK_STRING) {

        list.println(tokenizer.getStringValue());

      }

    }

  }

}
inspects a PDF file : Introduction « PDF « Java Tutorial
