利用POI将PPT转换为图片

POI 除了可以操作word、excel之外，还可以操作ppt文档，不过我没找到如何用POI将ppt文档转换为html，目前只找到ppt转图片的方法，该方法有许多地方需要改进，比如图片失真较严重，背景颜色无法显示等。

public static void  convertPPT2Image(String pptFilePath,String imageFilePath)
	throws IOException
	{
		File pptFile = new File(pptFilePath);
		File imageFile = new File(imageFilePath);
		File imageFileParent = new File(imageFile.getParent());
		List<File> multiImageFiles = new ArrayList<File>();//因为一张幻灯片生成一张图片，需要将所有的图片保存起来，供后面拼装成一张图片
		InputStream is = null;
		OutputStream out = null;
		try{
			if(pptFile.exists()){
				if(!imageFileParent.exists()){
					imageFileParent.mkdirs();
				}
				is = new FileInputStream(pptFile);
				SlideShow ppt = new SlideShow(is);
				Dimension pgSize = ppt.getPageSize();
				Slide[] slide = ppt.getSlides();
				
				for(int i = 0 ; i < slide.length; i++){
					TextRun[] textRuns = slide[i].getTextRuns();
					
					for(int k = 0; k < textRuns.length; k++){
						RichTextRun[] richTextRuns = textRuns[k].getRichTextRuns();
						for(int j = 0; j < richTextRuns.length; j++){
							richTextRuns[j].setFontIndex(1);
							richTextRuns[j].setFontName("宋体");
						}
					}
					
					BufferedImage image = new BufferedImage(pgSize.width,pgSize.height,BufferedImage.TYPE_INT_RGB);
					Graphics2D graphics = image.createGraphics();
					graphics.fill(new Rectangle2D.Float(0,0,pgSize.width,pgSize.height));
					slide[i].draw(graphics);
					
					String tempFileName = imageFile.getParent()+"/"+i+imageFile.getName();
					out = new FileOutputStream(tempFileName);
					multiImageFiles.add(new File(tempFileName));
					ImageIO.write(image, "jpg", out);
					out.close();
					is.close();
				}
				mergeMultiImageFiles(multiImageFiles,imageFile);//该方法将多个图片拼装为一张图片
			}
			
		}finally{
			try{
				if(is != null){
					is.close();
				}
				if(out != null){
					out.close();
				}
			}catch(IOException e){
				e.printStackTrace();
			}
			
		}
	}

拼装图片的方法为：

public static void mergeMultiImageFiles(List<File> imageFiles,File image)
	throws IOException
	{
		if(imageFiles != null && imageFiles.size() > 0){
			BufferedImage imageNew = null;
			for(int i = 0 ; i < imageFiles.size(); i++){
				BufferedImage imageBuffer = ImageIO.read(imageFiles.get(i));
				int width = imageBuffer.getWidth();
				int height = imageBuffer.getHeight();
				
				if(imageNew == null){
					imageNew = new BufferedImage(width,(height + SEPARATE_DISTANCE)* imageFiles.size(),BufferedImage.TYPE_INT_RGB);
				}
				
				int[] imageRgbArray = new int[width * height]; 
				imageRgbArray = imageBuffer.getRGB(0, 0, width, height, imageRgbArray, 0, width);
				
				imageNew.setRGB(0, (height+SEPARATE_DISTANCE) * i, width, height, imageRgbArray, 0, width);//SEPARATE_DISTANCE表示两张图片的间隔距离
				
			}
			ImageIO.write(imageNew, "jpg", image);
		}
	}

上面这个方法是竖着拼装，大家也可以改成横向或者其他方式拼装图片。