java - 将 JScrollPane 内容打印为 pdf

Question

我发现这段代码将 JPanel 传输到图像，然后将其打印到 PDF 文件，但因为我的 JPanel 位于 JScrollPane 内，并且不包含任何布局或尺寸，因为它取决于 JScrollPane 布局，所以我可以不要打印它。错误说无法打印高度为 0 和宽度为 0 的图片。当我尝试传递 JScrollPane 本身时，我只打印了 JScrollPane 的框架，而没有内容 JPanel。

public void printToPDF(java.awt.Image awtImage, String fileName) {
    try {
        Document d = new Document();
        PdfWriter writer = PdfWriter.getInstance(d, new FileOutputStream(
                fileName));
        d.open();


        Image iTextImage = Image.getInstance(writer, awtImage, 1);
        //iTextImage.setAbsolutePosition(100,300);
        iTextImage.scalePercent(100);
        d.add(iTextImage);

        d.close();

    } catch (Exception e) {
        e.printStackTrace();
    }   
}

public static java.awt.Image getImageFromPanel(Component component) {

    BufferedImage image = new BufferedImage(component.getWidth(),
            component.getHeight(), BufferedImage.TYPE_INT_RGB);
    component.paint(image.getGraphics());
    return image;
}

这是主要方法:

         JScrollPane scrollPane = new JScrollPane();
    scrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
    scrollPane.setBounds(0, 0, 600, 510);
    scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
    getContentPane().add(scrollPane);

    GridBagConstraints c = new GridBagConstraints();
    JPanel borderpanel = new JPanel();
    scrollPane.setViewportView(borderpanel);

    Color veryLight = new Color(239,230,230);
    JPanel container = new JPanel();
    borderpanel.add(container, BorderLayout.CENTER);
    container.setLayout(new GridLayout(0,1,0,1));
    container.setBackground(Color.WHITE);

    JPanel test = new JPanel();
    test.setLayout(new GridLayout(0,1,0,1));
    container.add(test, BorderLayout.CENTER);

        JPanel rowPanel = new JPanel();
        rowPanel.setPreferredSize(new Dimension(580,50));
        test.add(rowPanel, BorderLayout.WEST);
        rowPanel.setLayout(null);

        JLabel auctionTitle = new JLabel("Auction Title");
        auctionTitle.setForeground(Color.WHITE);
        auctionTitle.setFont(new Font("Tahoma", Font.PLAIN, 14));
        auctionTitle.setBounds(102, 0, 82, 20);
        rowPanel.add(auctionTitle); 
        rowPanel.setBackground(SystemColor.GRAY);

        JTextArea textArea = new JTextArea();
        textArea.setBackground(veryLight);
        textArea.setBounds(191, 0, 386, 50);
        rowPanel.add(textArea);


        final java.awt.Image image = getImageFromPanel(borderpanel);

        String fileName = "C:\\Users\\Test\\Desktop\\newfile.pdf";
        printToPDF(image, fileName);

我想打印borderpanel

Answer 1

使用java.awt.Robot获取面板图像:

public static java.awt.Image getImageFromPanel(Component component) {

    Point p = new Point(0, 0);
    SwingUtilities.convertPointToScreen(p, component);

    int width = component.getSize().width;
    int height = component.getSize().height;
    Rectangle screenBounds = new Rectangle(p.x, p.y, width, height);

    Robot robot = new Robot();
    BufferedImage image = robot.createScreenCapture(screenBounds);

    component.getGraphics().drawImage(image, 0, 0, component);

    return image;
}