用Apache POI将PPT转换为PNG [英] Convert ppt to png with apache poi

问题描述

当我使用以下代码将ppt转换为png时:

When I convert ppt to png using follow code:

public static void main(String[] args) throws FileNotFoundException,
        IOException {
    final String PPT_TEMPLATE = "data/test.pptx";
    float scale = 1;
    XMLSlideShow ppt = new XMLSlideShow(new FileInputStream(PPT_TEMPLATE));

    Dimension pgsize = ppt.getPageSize();
    int width = (int) (pgsize.width * scale);
    int height = (int) (pgsize.height * scale);

    XSLFSlide slide = ppt.getSlides()[5];

    BufferedImage img = new BufferedImage(width, height,
            BufferedImage.TYPE_INT_ARGB);
    Graphics2D graphics = img.createGraphics();

    // default rendering options
    graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
            RenderingHints.VALUE_ANTIALIAS_ON);
    graphics.setRenderingHint(RenderingHints.KEY_RENDERING,
            RenderingHints.VALUE_RENDER_QUALITY);
    graphics.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
            RenderingHints.VALUE_INTERPOLATION_BICUBIC);
    graphics.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS,
            RenderingHints.VALUE_FRACTIONALMETRICS_ON);

    graphics.setColor(Color.white);
    graphics.clearRect(0, 0, width, height);

    graphics.scale(scale, scale);

    // draw stuff
    slide.draw(graphics);

    // save the result
    FileOutputStream out = new FileOutputStream(new File("D:/test.png"));
    try {
        ImageIO.write(img, "png", out);
    } finally {
        out.close();
    }
    System.out.println("Job Done");
}

我无法获得正确的PNG.

And I can't get the correct PNG.

第一张图片是ppt的幻灯片，第二张图片是转换后的结果.

first picture is a slide from ppt and second picture is the result after converting.

如何获得正确的结果?

[ 并且我已经确认无法显示转化图表.

And I have confirmed that conversion chart can't display.

推荐答案

TutorialPoint非常简单，但是几乎没有进行任何调整的教程即可做到

TutorialPoint has a very straight forward but with little tweaking tutorial to do that HERE. I modified to display a full pptx document on JFrame found the code below:

try {
        outFile = new File("pages/" + fileName); //fileName here is the name of the folder to save all the slides
        if (!outFile.exists()) {
            outFile.mkdir();
            //creating an empty presentation
            XMLSlideShow ppt = new XMLSlideShow(is);

            //getting the dimensions and size of the slide
            Dimension pgsize = ppt.getPageSize();
            XSLFSlide[] slide = ppt.getSlides();

            BufferedImage img = new BufferedImage(pgsize.width, pgsize.height, BufferedImage.TYPE_INT_RGB);

            for (int i = 0; i < slide.length; i++) {
                Graphics2D graphics = img.createGraphics();

                //clear the drawing area
                graphics.setPaint(Color.white);
                graphics.fill(new Rectangle2D.Float(0, 0, pgsize.width, pgsize.height));

                //render
                slide[i].draw(graphics);
                //creating an image file as output
                System.out.println(outFile.getName() + "/" + i + ".png");
                OutputStream out = new FileOutputStream("pages/" + fileName + "/" + i + ".png");
                javax.imageio.ImageIO.write(img, "png", out);
                out.close();
            }
        }
        JPanel panel = new JPanel();
        panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
        if (outFile.exists() && outFile.isDirectory()) { //Always a good practice to check to avoid errors
            final FilenameFilter IMAGE_FILTER = new FilenameFilter() {
                @Override
                public boolean accept(final File dir, final String name) {
                    if (name.endsWith(".png")) //make sure only png are valid
                        return (true);
                    else
                        return (false);
                }
            };

            for (final File f : outFile.listFiles(IMAGE_FILTER)) {//fetch all png files within the folder
                panel.add(new JLabel(new ImageIcon(f.getAbsolutePath())));
            }
        }

        JScrollPane labelScrollPane = new JScrollPane(panel); //Wrapped in scrollpane just in case the slides are much
        add(labelScrollPane); //Add to frame or panel

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