POI操作ppt，合并，转图片

引入POI

compile group: 'org.apache.poi', name: 'poi-ooxml', version: '4.1.0' 
compile group: 'batik', name: 'batik-bridge', version: '1.6-1' 
compile group: 'org.apache.xmlgraphics', name: 'batik-anim', version: '1.11'

/**
 * https://www.w3cschool.cn/apache_poi_ppt/apache_poi_ppt_to_image.html
 */
@Test
public void testMerge() throws Exception{
    String file1 = "E:\\pptmerge\\x1.pptx";
    String file2 = "E:\\pptmerge\\x2.pptx";

    FileInputStream is = new FileInputStream(file1);
    XMLSlideShow src = new XMLSlideShow(is);
    is.close();
    FileInputStream is2 = new FileInputStream(file2);
    XMLSlideShow src2 = new XMLSlideShow(is2);
    is2.close();

    XMLSlideShow ppt = new XMLSlideShow();
    for (XSLFSlide slide : src.getSlides()) {
        XSLFSlide slide1 = ppt.createSlide(slide.getSlideLayout());
        slide1.importContent(slide);
    }
    for (XSLFSlide slide : src2.getSlides()) {
        XSLFSlide slide1 = ppt.createSlide(slide.getSlideLayout());
        slide1.importContent(slide);
    }

    FileOutputStream out = new FileOutputStream("E:\\pptmerge\\merged2.pptx");
    ppt.write(out);
    out.close();
    System.out.println("merge successfully");
}
@Test
public void testPic() throws Exception{
    BufferedImage img = new BufferedImage(100, 100,BufferedImage.TYPE_INT_RGB);
    img.createGraphics().draw3DRect(0,0,120,100,true);
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    ImageIO.write(img,"png",out);

    XMLSlideShow ppt = new XMLSlideShow();
    XSLFSlide slide = ppt.createSlide();
    XSLFPictureData pictureData = ppt.addPicture(out.toByteArray(), XSLFPictureData.PictureType.PNG);
    XSLFPictureShape picture = slide.createPicture(pictureData);

    File file=new File("E:\\pptmerge\\pic.pptx");
    FileOutputStream outppt = new FileOutputStream(file);

    //saving the changes to a file
    ppt.write(outppt);
    out.close();
    System.out.println("image successfully");
}

@Test
public void testCreatePicFromPPT() throws Exception{
    //creating an empty presentation
    File file=new File("E:\\pptmerge\\ppt.pptx");
    XMLSlideShow ppt = new XMLSlideShow(new FileInputStream(file));

    //getting the dimensions and size of the slide
    Dimension pgsize = ppt.getPageSize();
    List<XSLFSlide> slides = ppt.getSlides();

    XMLSlideShow pptout = new XMLSlideShow();

    for (int i = 0; i < slides.size(); i++) {
        XSLFSlide xslfShapes = slides.get(i);
        BufferedImage img = new BufferedImage(pgsize.width, pgsize.height,BufferedImage.TYPE_INT_RGB);
        Graphics2D graphics = img.createGraphics();

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

        //render
        xslfShapes.draw(graphics);

        ByteArrayOutputStream out = new ByteArrayOutputStream();
        ImageIO.write(img,"png",out);

        XSLFSlide slide = pptout.createSlide();
        XSLFPictureData pictureData = pptout.addPicture(out.toByteArray(), XSLFPictureData.PictureType.PNG);
        XSLFPictureShape picture = slide.createPicture(pictureData);
    }

    //creating an image file as output
    FileOutputStream out = new FileOutputStream("E:\\pptmerge\\testCreatePicFromPPT.pptx");
    pptout.write(out);

    out.close();
    System.out.println("Image successfully created");
}