POI + PDFbox将PPT有图表页转换成图片

朱雀 2020-10-17 18:32 1114阅读 0赞

使用poi将PPT中有图表页转换成图片存在一些问题，转成图片的时候图表没有了，数据丢失。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nhb3lhbmcwMTA1_size_16_color_FFFFFF_t_70][]

所以用一个中转的方法，现将PPT的图表页转换成PDF，再将PDF转换成图片，虽然麻烦点，但是没有出现任何问题。

先添加依赖

<dependency>
    			<groupId>org.apache.pdfbox</groupId>
    			<artifactId>pdfbox-app</artifactId>
    			<version>2.0.12</version>
    		</dependency>
    		<dependency>
    			<groupId>org.apache.pdfbox</groupId>
    			<artifactId>fontbox</artifactId>
    			<version>2.0.12</version>
    		</dependency>
    
    
    <dependency>
    			<groupId>org.apache.poi</groupId>
    			<artifactId>poi</artifactId>
    			<version>3.15</version>
    		</dependency>
    		<dependency>
    			<groupId>org.apache.poi</groupId>
    			<artifactId>poi-ooxml</artifactId>
    			<version>3.15</version>
    		</dependency>
    		<dependency>
    			<groupId>org.apache.poi</groupId>
    			<artifactId>poi-scratchpad</artifactId>
    			<version>3.15</version>
    		</dependency>
    		<dependency>
    			<groupId>org.apache.poi</groupId>
    			<artifactId>ooxml-schemas</artifactId>
    			<version>1.3</version>
    		</dependency>

上代码：

这段代码里边有将PPT图表页转换成图片、添加水印和获取全部文本的功能。

public static void main(String[] args) {
            try {
                extractCharts();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    
        public static void extractCharts() throws Exception {
    
            //poi解析PPT获取图表以及图表的所在页
            XMLSlideShow ppt = new XMLSlideShow(new FileInputStream("D:\\nfc111.pptx"));
            XSLFSlide[] slides = ppt.getSlides().toArray(new XSLFSlide[0]);
    
    
            //pdfbox解析PDF将图表所在页生成图片
            PDDocument document = PDDocument.load(new FileInputStream("D:\\nfc111.pdf"));
            PDFRenderer renderer = new PDFRenderer(document);
    
            //PdfReader pdfReader = new PdfReader(FILE_NAME);
            String waterMarkContent = "Hello World !";
    
            for (int i = 0; i < slides.length; i++) {
                XSLFShape[] sh = slides[i].getShapes().toArray(new XSLFShape[0]);
                //XSLFSlide slide = ppt.getSlides().get(i);
    
    
                for (int j = 0; j < sh.length; j++) {
                    XSLFShape shape = sh[j];
    
    
                    if (shape instanceof XSLFGraphicFrame) {
                        
                        //System.out.println(textFromPage);
    
                        //获取全部文本
                        /*PDFTextStripper pdfTextStripper = new PDFTextStripper();
    
                        pdfTextStripper.setSortByPosition(true);
                        pdfTextStripper.setStartPage(i);
                        pdfTextStripper.setEndPage(i);
                        String content = pdfTextStripper.getText(document);
                        System.out.print(content);*/
                        /*Image image = renderer.renderImageWithDPI(i, 100);*/
                        //生成图片代码，100是生成的图片大小
                        BufferedImage image = renderer.renderImageWithDPI(i, 100);
                        BufferedImage buffImg = new BufferedImage(image.getWidth(null),
                                image.getHeight(null), BufferedImage.TYPE_INT_RGB);
    
                        Graphics2D graphics = buffImg.createGraphics();
                        graphics.setColor(Color.RED);
                        graphics.setFont(new Font("宋体", Font.BOLD, 36));
                        graphics.drawImage(image, 0, 0, image.getWidth(null), image.getHeight(null), null);
    
                        int x = image.getWidth(null) - 2*getWatermarkLength(waterMarkContent,graphics);
                        int y = image.getHeight(null) - 2*getWatermarkLength(waterMarkContent,graphics);
                        graphics.drawString(waterMarkContent, x, y);
                        graphics.dispose();
    
    
                        FileOutputStream out = new FileOutputStream("D:\\d\\" + UUID.randomUUID() + ".png");
                        ImageIO.write(buffImg, "png", out);
                        ppt.write(out);
                        out.close();
                        break;
                    }
                }
            }
    
    
        }
    
        public static int getWatermarkLength(String waterMarkContent, Graphics2D graphics) {
            return graphics.getFontMetrics(graphics.getFont()).charsWidth(waterMarkContent.toCharArray(), 0, waterMarkContent.length());
        }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nhb3lhbmcwMTA1_size_16_color_FFFFFF_t_70]: /images/1602959540414.png