How to save a JEditorPane as a pdf?

Question

I'm trying to save text from a JEditorPane as a pdf once a save button is clicked.

saveAs.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {

            String title = JOptionPane.showInputDialog(null, "Enter a name for file...");
            try{
                paintToPDF(newBlanktoEdit, title);
            }catch (Exception exc){
                exc.printStackTrace();
            }
        }
    });

The method paintToPDF does the job correctly, however the Pane is parsed as a graphics2D component, and so wrapping the line is not possible.

protected void paintToPDF(JEditorPane newPane, String title) throws Exception{

    newPane.setBounds(0, 0, (int) convertToPixels(612 - 58), (int) convertToPixels(792 - 60));

    Document doc = new Document();
    FileOutputStream out = new FileOutputStream(title + ".pdf");
    PdfWriter writer = PdfWriter.getInstance(doc, out);

    doc.setPageSize(new com.lowagie.text.Rectangle(612, 792));
    doc.open();
    PdfContentByte cb = writer.getDirectContent();
    cb.saveState();
    cb.concatCTM(1, 0, 0, 1, 0, 0);

    DefaultFontMapper mapper = new DefaultFontMapper();
    mapper.insertDirectory("c:/windows/fonts");

    Graphics2D g = cb.createGraphics(612, 792, mapper, true, .92f);

    AffineTransform at = new AffineTransform();
    at.translate(convertToPixels(20), convertToPixels(20));
    at.scale(pixelToPoint, pixelToPoint);

    g.transform(at);
    g.setColor(Color.WHITE);
    g.fill(newPane.getBounds());

    Rectangle alloc = getVisivleEditorRect(newPane);
    newPane.getUI().getRootView(newPane).paint(g, alloc);

    g.setColor(Color.BLACK);
    g.draw(newPane.getBounds());

    g.dispose();
    cb.restoreState();
    doc.close();
    out.flush();
    out.close();
}

private float convertToPixels(int points){

    return (float) (points / pixelToPoint);
}

private Rectangle getVisivleEditorRect(JEditorPane newPane){

    Rectangle alloc = newPane.getBounds();
    if((alloc.width > 0) && (alloc.height > 0)){
        alloc.x = alloc.y = 0;
        Insets insets = newPane.getInsets();
        alloc.x += insets.left;
        alloc.y += insets.top;
        alloc.width -= insets.left + insets.right;
        alloc.height -= insets.top + insets.bottom;
        return alloc;
    }
    return null;
}

with,

int inch = Toolkit.getDefaultToolkit().getScreenResolution();
float pixelToPoint = (float) 72 / (float) inch;

I'm looking for a solution based on an external library, i tried expermenting with iText and PDFBox, to no avail so far.

I want to point out that the solution above uses com.lowagielibrary.

Answer 1

From what I understand you want to convert your GUI to images and print it in a PDF, if this is not what you want please clarify.

Here's a simple program that creates the following GUI (without the text written in it), which is a JTextArea and a JButton.

When clicked, the button opens a new Document, takes the area and converts it to an image, then adds that image to the PDF and later does the same with the button, so you get a similar output in a PDF like this one:

The trick is to use both java.awt.Image and com.itextpdf.text.Image, the former to convert the JComponent to images and the latter to print them in the PDF, this trick was found and based on this peeskillet's answer.

So, without further explanation, here's the code that achieves the results above:

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;

import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Image;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.pdf.PdfWriter;

public class PdfFromUserInput {

    private JFrame frame;
    private JTextArea area;
    private JButton button;
    private Document document;
    private PdfWriter writer;

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new PdfFromUserInput().createAndShowGui();
            }
        });
    }

    public void openPdf() throws FileNotFoundException, DocumentException {
        document = new Document(PageSize.A4, 30, 30, 30, 30);
        writer = PdfWriter.getInstance(document, new FileOutputStream("myFile.pdf"));
        document.open();
    }

    public void closePdf() {
        document.close();
    }

    public java.awt.Image getImageFromComponent(JComponent component) throws DocumentException {
        BufferedImage image = new BufferedImage(component.getWidth(), component.getHeight(), BufferedImage.TYPE_INT_RGB);
        component.paint(image.getGraphics());
        return image;
    }

    public void addImageToDocument(java.awt.Image img) throws IOException, DocumentException {
        Image image = Image.getInstance(writer, img, 1);
        image.scalePercent(50);
        document.add(image);
        System.out.println("printed!");
    }

    public void createAndShowGui() {
        frame = new JFrame("PDF creator");
        area = new JTextArea(10, 30);
        area.setBorder(BorderFactory.createLineBorder(Color.RED));
        button = new JButton("Create PDF");

        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                try {
                    openPdf();
                    java.awt.Image img = getImageFromComponent(area);
                    addImageToDocument(img);
                    img = getImageFromComponent(button);
                    addImageToDocument(img);
                    closePdf();
                } catch (DocumentException e1) {
                    e1.printStackTrace();
                } catch (FileNotFoundException e1) {
                    e1.printStackTrace();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
        });

        frame.add(area, BorderLayout.CENTER);
        frame.add(button, BorderLayout.SOUTH);

        frame.pack();
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}