如何将JEditorPane另存为pdf? [英] How to save a JEditorPane as a pdf?

问题描述

单击保存按钮后，我试图将JEditorPane中的文本另存为pdf.

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();
            }
        }
    });

方法paintToPDF正确完成了工作，但是Pane被解析为graphics2D组件，因此不可能换行.

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;
}

使用

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

我正在寻找基于外部库的解决方案，到目前为止，我尝试使用iText和PDFBox进行实验，但无济于事.

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

我想指出的是，上述解决方案使用的是com.lowagie库.

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

推荐答案

根据我的理解，您希望将GUI转换为图像并以PDF格式打印，如果不是您想要的，请说明.

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.

这是一个简单的程序，它创建以下GUI(没有写在其中的文本)，即JTextArea和JButton.

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

单击后，该按钮将打开一个新文档，将该区域转换为图像，然后将该图像添加到PDF中，然后再使用该按钮进行相同操作，因此您可以在PDF中获得类似的输出，如下所示一个:

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:

诀窍是同时使用java.awt.Image和com.itextpdf.text.Image，前者将JComponent转换为图像，而后者将它们打印在PDF中，这是基于peeskillet的answer .

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.

因此，无需进一步说明，下面是实现以上结果的代码:

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);
    }
}

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