java - 使用 apache poi 从 pptx 中提取图像

Question

我正在尝试使用 Apache POI 从 ppt 文件中提取幻灯片，这没有问题，但现在我打算打开 pptx 文件并执行相同的操作，有人知道如何操作吗？

这是从 ppt 文件中提取图像的代码:

public ImageIcon display() throws JPresentationException { 

    Background background; 
    background = slides[current].getBackground(); 
    Fill f = background.getFill(); 
    Color color = f.getForegroundColor(); 
    Dimension dimension = ppt.getPageSize(); 
    shapes = slides[current].getShapes(); 
    BufferedImage img = new BufferedImage(dimension.width, dimension.height, BufferedImage.TYPE_INT_RGB); 
    Graphics2D graphics = img.createGraphics(); 
    graphics.setPaint(color); 
    graphics.fill(new Rectangle2D.Float(0, 0, dimension.width, dimension.height)); 
    slides[current].draw(graphics); 
    ImageIcon icon = new ImageIcon(img); 

    return icon; 
}

Answer 1

虽然可以引用一些example code来自 POI 项目本身以下是您应该寻找的内容；希望这有帮助；

private ImageIcon generateFromPPTX(int index) {
    ImageIcon icon = null;
    XMLSlideShow slideShowPPTX = null;
    FileInputStream pptInputStream = null;
    XSLFSlide [] allSlides = null;
    XSLFSlide singleSlide = null;
    BufferedImage memoryImage = null;
    Graphics2D graphics = null;
    try{
        pptInputStream = new FileInputStream("somepptx-file.pptx");
        slideShowPPTX = new XMLSlideShow(pptInputStream);
        allSlides = slideShowPPTX.getSlides();
        if(allSlides == null || allSlides.length == 0) {
            System.out.println("Empty presentation!");
            return null;
        }

        singleSlide = allSlides [index];
        memoryImage = new BufferedImage(slideShowPPTX.getPageSize().width, slideShowPPTX.getPageSize().height, BufferedImage.TYPE_INT_ARGB);
        graphics = memoryImage.createGraphics();
        // Only few rendering hints set but you can set as many as you need depending on your need
        graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        graphics.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
        graphics.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
        graphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
        singleSlide.draw(graphics);
        icon = new ImageIcon(memoryImage);
    }
    catch(IOException exception){
        System.err.println("Input/output Exception:");
        exception.printStackTrace();
    }
    finally{
        slideShowPPTX = null;
        allSlides = null;
        singleSlide = null;
        memoryImage = null;
        graphics = null;
        if(pptInputStream != null){
            try {
                pptInputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            pptInputStream = null;
        }
    }
    return icon;
}