java PPT 转成PDF，中文乱码解决

ppt转成pdf，原理是ppt转成图片，再用图片生产pdf，过程有个问题，不管是ppt还是pptx，都遇到中文乱码，编程方框的问题，其中ppt后缀网上随便找就有解决方案，就是设置字体为统一字体，pptx如果页面是一种中文字体不会有问题，如果一个页面有微软雅黑和宋体，就会导致部分中文方框，怀疑是poi处理的时候，只读取第一种字体，所以导致多个中文字体乱码。

百度和谷歌都找了很久，有看到说apache官网有人说是bug（https://bz.apache.org/bugzilla/show_bug.cgi?id=54880 ），但他们回复说是字体问题，这个问题其实我觉得poi可能可以自己做，读取原来字体设置成当前字体，不过性能应该会有很多消耗，反正我估计很多人跟我一样花费大量时间找解决方案，网上几乎没有现成的方案。自己也是一步步尝试，最终找到解决办法，ppt格式的就不说了网上找得到，pptx后缀的网上我是没找到。

问题前的pptx转成图片：

解决后的pptx转成图片：

解决方法：

图取每个shape，将文字转成统一的字体，网上找到的那段代码不可行，我自己改的方案如下：

             for( XSLFShape shape : slide[i].getShapes() ){
                    if ( shape instanceof XSLFTextShape ){
                        XSLFTextShape txtshape = (XSLFTextShape)shape ;
                        System.out.println("txtshape" + (i+1) + ":"  + txtshape.getShapeName());
                        System.out.println("text:" +txtshape.getText());

                        for ( XSLFTextParagraph textPara : txtshape.getTextParagraphs() ){
                            List<XSLFTextRun> textRunList = textPara.getTextRuns();
                            for(XSLFTextRun textRun: textRunList) {
                                textRun.setFontFamily("宋体");
                            }
                        }
                    }
                }

完整代码如下（除了以上自己的解决方案，大部分是stackoverflow上的代码）：

public static void convertPPTToPDF(String sourcepath, String destinationPath, String fileType) throws Exception {
        FileInputStream inputStream = new FileInputStream(sourcepath);
        double zoom = 2;
        AffineTransform at = new AffineTransform();
        at.setToScale(zoom, zoom);
        Document pdfDocument = new Document();
        PdfWriter pdfWriter = PdfWriter.getInstance(pdfDocument, new FileOutputStream(destinationPath));
        PdfPTable table = new PdfPTable(1);
        pdfWriter.open();
        pdfDocument.open();
        Dimension pgsize = null;
        Image slideImage = null;
        BufferedImage img = null;
        if (fileType.equalsIgnoreCase(".ppt")) {
            SlideShow ppt = new SlideShow(inputStream);
            inputStream.close();
            pgsize = ppt.getPageSize();
            Slide slide[] = ppt.getSlides();
            pdfDocument.setPageSize(new Rectangle((float) pgsize.getWidth(), (float) pgsize.getHeight()));
            pdfWriter.open();
            pdfDocument.open();
            for (int i = 0; i < slide.length; i++) {

                TextRun[] truns = slide[i].getTextRuns();
                for ( int k=0;k<truns.length;k++){
                   RichTextRun[] rtruns = truns[k].getRichTextRuns();
                  for(int l=0;l<rtruns.length;l++){
//                       int index = rtruns[l].getFontIndex();
//                        String name = rtruns[l].getFontName();
                        rtruns[l].setFontIndex(1);
                        rtruns[l].setFontName("宋体");
                   }
                }      

                img = new BufferedImage((int) Math.ceil(pgsize.width * zoom), (int) Math.ceil(pgsize.height * zoom), BufferedImage.TYPE_INT_RGB);
                Graphics2D graphics = img.createGraphics();
                graphics.setTransform(at);

                graphics.setPaint(Color.white);
                graphics.fill(new Rectangle2D.Float(0, 0, pgsize.width, pgsize.height));
                slide[i].draw(graphics);
                graphics.getPaint();
                slideImage = Image.getInstance(img, null);
                table.addCell(new PdfPCell(slideImage, true));
            }
        }
        if (fileType.equalsIgnoreCase(".pptx")) {
            XMLSlideShow ppt = new XMLSlideShow(inputStream);
            pgsize = ppt.getPageSize();
            XSLFSlide slide[] = ppt.getSlides();
            pdfDocument.setPageSize(new Rectangle((float) pgsize.getWidth(), (float) pgsize.getHeight()));
            pdfWriter.open();
            pdfDocument.open();

            for (int i = 0; i < slide.length; i++) {
                for( XSLFShape shape : slide[i].getShapes() ){
                    if ( shape instanceof XSLFTextShape ){
                        XSLFTextShape txtshape = (XSLFTextShape)shape ;
                       // System.out.println("txtshape" + (i+1) + ":"  + txtshape.getShapeName());
                        //System.out.println("text:" +txtshape.getText());

                        for ( XSLFTextParagraph textPara : txtshape.getTextParagraphs() ){
                            List<XSLFTextRun> textRunList = textPara.getTextRuns();
                            for(XSLFTextRun textRun: textRunList) {
                                textRun.setFontFamily("宋体");
                            }
                        }
                    }
                }
                img = new BufferedImage((int) Math.ceil(pgsize.width * zoom), (int) Math.ceil(pgsize.height * zoom), BufferedImage.TYPE_INT_RGB);
                Graphics2D graphics = img.createGraphics();
                graphics.setTransform(at);
                graphics.setPaint(Color.white);
                graphics.fill(new Rectangle2D.Float(0, 0, pgsize.width, pgsize.height));
                slide[i].draw(graphics);

//                FileOutputStream out = new FileOutputStream("src/main/resources/test"+i+".jpg");
//                javax.imageio.ImageIO.write(img, "jpg", out);

                graphics.getPaint();
                slideImage = Image.getInstance(img, null);
                table.addCell(new PdfPCell(slideImage, true));
            }
        }
        pdfDocument.add(table);
        pdfDocument.close();
        pdfWriter.close();
        System.out.println("Powerpoint file converted to PDF successfully");
    }

maven配置:

<dependency>
      <groupId>org.apache.poi</groupId>
        <artifactId>poi</artifactId>
    <!--  <version>3.13</version> -->
     <version>3.9</version>
    </dependency>
    <dependency>
        <groupId>org.apache.poi</groupId>
        <artifactId>poi-ooxml</artifactId>
       <!--  <version>3.10-FINAL</version> -->
       <version>3.9</version>
    </dependency>

    <dependency>
          <groupId>com.itextpdf</groupId>
          <artifactId>itextpdf</artifactId>
          <version>5.5.7</version>
    </dependency>

    <dependency>
      <groupId>com.itextpdf.tool</groupId>
      <artifactId>xmlworker</artifactId>
      <version>5.5.7</version>
    </dependency>
    <dependency>
      <groupId>org.apache.poi</groupId>
      <artifactId>poi-scratchpad</artifactId>
      <!--  <version>3.12</version> -->
       <version>3.9</version>
    </dependency>

参考资料：

http://www.tutorialspoint.com/apache_poi_ppt/apache_poi_ppt_quick_guide.htm

文章转载自 开源中国社区[https://www.oschina.net]