iText in Action: Chapter 16: PDF streams

part4.chapter16.ListUsedFonts

If you compile and execute this example, you'll get the following result:

You can download the full source code of ListUsedFonts, or read it here:

/*
 * This class is part of the book "iText in Action - 2nd Edition"
 * written by Bruno Lowagie (ISBN: 9781935182610)
 * For more info, go to: http://itextpdf.com/examples/
 * This example only works with the AGPL version of iText.
 */
 
package part4.chapter16;
 
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Set;
import java.util.TreeSet;
 
import part3.chapter11.FontTypes;
 
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.pdf.PdfDictionary;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfReader;
 
public class ListUsedFonts {
 
    /** The resulting PDF file. */
    public static String RESULT
        = "results/part4/chapter16/fonts.txt";
 
    /**
     * Creates a Set containing information about the fonts in the src PDF file.
     * @param src the path to a PDF file
     * @throws IOException
     */
    public Set<String> listFonts(String src) throws IOException {
        Set<String> set = new TreeSet<String>();
        PdfReader reader = new PdfReader(src);
        PdfDictionary resources;
        for (int k = 1; k <= reader.getNumberOfPages(); ++k) {
            resources = reader.getPageN(k).getAsDict(PdfName.RESOURCES);
            processResource(set, resources);
        }
        reader.close();
        return set;
    }
 
    /**
     * Extracts the font names from page or XObject resources.
     * @param set the set with the font names
     * @param resources the resources dictionary
     */
    public static void processResource(Set<String> set, PdfDictionary resource) {
        if (resource == null)
            return;
        PdfDictionary xobjects = resource.getAsDict(PdfName.XOBJECT);
        if (xobjects != null) {
            for (PdfName key : xobjects.getKeys()) {
                processResource(set, xobjects.getAsDict(key));
            }
        }
        PdfDictionary fonts = resource.getAsDict(PdfName.FONT);
        if (fonts == null)
            return;
        PdfDictionary font;
        for (PdfName key : fonts.getKeys()) {
            font = fonts.getAsDict(key);
            String name = font.getAsName(PdfName.BASEFONT).toString();
            if (name.length() > 8 && name.charAt(7) == '+') {
                name = String.format("%s subset (%s)", name.substring(8), name.substring(1, 7));
            }
            else {
                name = name.substring(1);
                PdfDictionary desc = font.getAsDict(PdfName.FONTDESCRIPTOR);
                if (desc == null)
                    name += " nofontdescriptor";
                else if (desc.get(PdfName.FONTFILE) != null)
                    name += " (Type 1) embedded";
                else if (desc.get(PdfName.FONTFILE2) != null)
                    name += " (TrueType) embedded";
                else if (desc.get(PdfName.FONTFILE3) != null)
                    name += " (" + font.getAsName(PdfName.SUBTYPE).toString().substring(1) + ") embedded";
            }
            set.add(name);
        }
    }
 
    /**
     * Main method.
     *
     * @param    args    no arguments needed
     * @throws DocumentException 
     * @throws IOException
     */
    public static void main(String[] args) throws IOException, DocumentException {
        new FontTypes().createPdf(FontTypes.RESULT);
        Set<String> set = new ListUsedFonts().listFonts(FontTypes.RESULT);
        PrintWriter out = new PrintWriter(new FileOutputStream(RESULT));
        for (String fontname : set)
            out.println(fontname);
        out.flush();
        out.close();
    }
}
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The ListUsedFonts example is part of the book iText in Action (ISBN 9781935182610).

It's a small standalone application. You can use this example for inspiration, but please read the book if there's something you don't understand about the example. You'll find more info in Chapter 16.

Keywords for this example: Existing PDFs, Font, PDF dictionary, PDF name, PDF stream, PdfReader, Font > fonts in existing PDF

If you want this example to work, you need the following jars: iText.jar, itext-asian.jar