Extracting objects from a PDF

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8th November 2015
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ExtractStreams.java
/**
 * Example written by Bruno Lowagie in answer to the following question:
 * http://stackoverflow.com/questions/30286601/extracting-an-embedded-object-from-a-pdf
 */
package sandbox.parse;

import com.itextpdf.text.exceptions.UnsupportedPdfException;
import com.itextpdf.text.pdf.PRStream;
import com.itextpdf.text.pdf.PdfObject;
import com.itextpdf.text.pdf.PdfReader;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * @author iText
 */
public class ExtractStreams {
    public static final String SRC = "resources/pdfs/image.pdf";
    public static final String DEST = "results/parse/stream%s";
    
    public static void main(String[] args) throws IOException {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new ExtractStreams().parse(SRC, DEST);
    }
    
    public void parse(String src, String dest) throws IOException {
        PdfReader reader = new PdfReader(src);
        PdfObject obj;
        for (int i = 1; i <= reader.getXrefSize(); i++) {
            obj = reader.getPdfObject(i);
            if (obj != null && obj.isStream()) {
                PRStream stream = (PRStream)obj;
                byte[] b;
                try {
                    b = PdfReader.getStreamBytes(stream);
                }
                catch(UnsupportedPdfException e) {
                    b = PdfReader.getStreamBytesRaw(stream);
                }
                FileOutputStream fos = new FileOutputStream(String.format(dest, i));
                fos.write(b);
                fos.flush();
                fos.close();
            }
        }
    }
}

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