java实现ppt/pptx转图片，转pdf的两种方式之二 aspose实现

上一个博客已经对aspose开发的准备工作说完了。

1.封装获取Presentation的方法

private static final Logger LOGGER = LoggerFactory.getLogger(OfficeTransferUtil.class);
    private static Presentation presentation = null;
    private static final String license = "\n" +
            "  \n" +
            "    \n" +
            "      Aspose.Total for Java\n" +
            "      Aspose.Words for Java\n" +
            "    \n" +
            "    Enterprise\n" +
            "    20991231\n" +
            "    20991231\n" +
            "    8bfe198c-7f0c-4ef8-8ff0-acc3237bf0d7\n" +
            "  \n" +
            "  sNLLKGMUdF0r8O1kKilWAGdgfs2BvJb/2Xp8p5iuDVfZXmhppo+d0Ran1P9TKdjV4ABwAgKXxJ3jcQTqE/2IRfqwnPf8itN8aFZlV3TJPYeD3yWE7IT55Gz6EijUpC7aKeoohTb4w2fpox58wWoF3SNp6sK6jDfiAUGEHYJ9pjU=\n" +
            "";


    /**
     * @param sourceFilePath ppt文件资源路径
     * @return
     */
    public static Presentation getPresentationFromSourcePPT(String sourceFilePath) {
        if (presentation == null) {
            ByteArrayInputStream is = new ByteArrayInputStream(license.getBytes());
            com.aspose.slides.License license = new com.aspose.slides.License();
            license.setLicense(is);
            presentation = new Presentation(sourceFilePath);
        }
        return presentation;
    }

2. ppt，pptx转图片的方法。

这一步是和poi唯一不同的一步，即实现ppt生成图片的方式不一样。这里用的是apose的 ISlide ，第二步图片转pdf是同一个方法。

 /**
     * @param sourceFilePath 资源文件路径
     * @param pptType        ppt的类型：ppt,pptx
     * @return
     */
    public static List convertPptToImages(String sourceFilePath, String pptType) {
        long startTime = System.currentTimeMillis();
        List pngFileList = new ArrayList<>();
        Presentation pres = getPresentationFromSourcePPT(sourceFilePath);
        ISlideCollection slides = pres.getSlides();
        int idx = 1;
        for (int i = 0; i < slides.size(); i++) {
            ISlide slide = slides.get_Item(i);
            int height = (int) (pres.getSlideSize().getSize().getHeight() - 150);
            int width = (int) (pres.getSlideSize().getSize().getWidth() - 150);
            BufferedImage img = slide.getThumbnail(new java.awt.Dimension(width, height));
            FileOutputStream out = null;
            File pngFile = null;
            try {
                if ("ppt".equalsIgnoreCase(pptType)) {
                    pngFile = new File(sourceFilePath.replace(".ppt", String.format("-%04d.png", idx++)));
                } else {
                    pngFile = new File(sourceFilePath.replace(".pptx", String.format("-%04d.png", idx++)));
                }
                out = new FileOutputStream(pngFile);
                ImageIO.write(img, "png", out);
                pngFileList.add(pngFile);
            } catch (Exception e) {
                LOGGER.error("{}2Png exception:{}", pptType, e);
            } finally {
                try {
                    if (out != null) {
                        out.flush();
                        out.close();
                    }
                    if (img != null) {
                        img.flush();
                    }
                } catch (IOException e) {
                    LOGGER.error("{}2Png close exception:{}", pptType, e);
                }
            }
        }
        long endTime = System.currentTimeMillis();
        LOGGER.info("PPT转PNG耗时：{}", endTime - startTime);
        return pngFileList;
    }

3.将png转pdf

 /**
     * @param pngFiles      png格式的图片文件
     * @param pdfFilePath   指定pdf的文件路径
     * @param watermarkPath 水印的图片地址
     * @return
     */
    public static File coverPng2Pdf(List pngFiles, String pdfFilePath, String watermarkPath) {
        long startTime = System.currentTimeMillis();
        Document document = new Document();
        File tempPdfFile = null;
        FileOutputStream fileOutputStream = null;
        try {
            String tempPdfFilePath = pdfFilePath.replace(".pdf", ".in.pdf");
            tempPdfFile = new File(tempPdfFilePath);
            fileOutputStream = new FileOutputStream(tempPdfFile);
            PdfWriter.getInstance(document, fileOutputStream);
            document.open();

            pngFiles.forEach(pngFile -> {
                try {
                    com.itextpdf.text.Image png = Image.getInstance(pngFile.getCanonicalPath());
                    png.scalePercent(90f);
                    document.add(png);
                } catch (Exception e) {
                    LOGGER.error("png2Pdf exception", e);
                }
            });
            document.close();
            fileOutputStream.flush();
            // 添加水印
            boolean ret = PDFWatermarkUtil.addWatermark(tempPdfFilePath, pdfFilePath, watermarkPath);
            long endTime = System.currentTimeMillis();
            LOGGER.info("PNG转PDF并加上水印耗时：{}", endTime - startTime);
            if (ret) {
                File pdfFile = new File(pdfFilePath);
                return pdfFile;
            }
        } catch (Exception e) {
            LOGGER.error(String.format("png2Pdf %s exception", pdfFilePath), e);
        } finally {
            try {
                if (document.isOpen()) {
                    document.close();
                }
                if (fileOutputStream != null) {
                    fileOutputStream.close();
                }
                if (tempPdfFile != null) {
                    tempPdfFile.delete();
                }
            } catch (IOException e) {
                LOGGER.error("fileOutputStream close false:{}", e);
            }
        }

        return null;
    }

4.下面是直接将ppt转pdf的方法

/**
     * @param sourceFilePath ppt文件资源路径
     * @param watermarkPath  pdf水印文件路径
     * @return
     */
    public static File convertPPTToPDF(String sourceFilePath, String watermarkPath) {
        String extension = "";
        long startTime = System.currentTimeMillis();
        Integer index = sourceFilePath.lastIndexOf(".");
        if (index > 0) {
            extension = sourceFilePath.substring(index + 1);
        }
        if (extension.equals("ppt") || extension.equals("pptx")) {
            String outputTempPdfFilePath = sourceFilePath.substring(0, index) + ".temp.pdf";
            File tempPdfFile = new File(outputTempPdfFilePath);
            FileOutputStream fileOutputStream = null;
            try {
                fileOutputStream = new FileOutputStream(tempPdfFile);


                Presentation pres = getPresentationFromSourcePPT(sourceFilePath);
                pres.save(fileOutputStream, com.aspose.slides.SaveFormat.Pdf);
                fileOutputStream.flush();
                LOGGER.info("Powerpoint file converted to PDF successfully!");
                long endTime = System.currentTimeMillis();
                LOGGER.info("PPT转PDF耗时：{}", endTime - startTime);

                String pdfFilePath = outputTempPdfFilePath.replace(".temp.pdf", ".pdf");
                // 添加水印,这个时候pdf文件已经有了。
                boolean ret = PDFWatermarkUtil.addWatermark(outputTempPdfFilePath, pdfFilePath, watermarkPath);
                if (ret) {
                    File pdfFile = new File(pdfFilePath);
                    return pdfFile;
                }
            } catch (Exception e) {
                LOGGER.error("ppt,pptx转pdf异常：{}", e);
            } finally {
                try {
                    if (fileOutputStream != null) {
                        fileOutputStream.close();
                    }
                    //删除 .temp.pdf的文件
                    if (tempPdfFile.exists()) {
                        tempPdfFile.delete();
                    }
                } catch (IOException e) {
                    LOGGER.error("关闭输出流异常：{}", e);
                }
            }
        }
        return null;
    }