Java实现pdf转图片案例

工程加入依赖：
<dependency>
   <groupId>org.apache.pdfbox</groupId>
   <artifactId>pdfbox</artifactId>
   <version>2.0.15</version>
  </dependency>
  <dependency>
   <groupId>org.apache.pdfbox</groupId>
   <artifactId>pdfbox-tools</artifactId>
   <version>2.0.15</version>
  </dependency>
pdf文件转图片：
    public static List<String> pdf2Img(File pdfFile) {
        if (pdfFile == null || !pdfFile.exists()) {
            throw new RuntimeException("pdf文件不能为空");
        }
        String name = pdfFile.getName().substring(0, pdfFile.getName().lastIndexOf("."));
        String targetPath = pdfFile.getParent() + File.separator + name;
        List<String> imgList = new ArrayList<>();
        try {
            PDDocument doc = PDDocument.load(pdfFile);
            // 页数
            int pageCount = doc.getNumberOfPages();
            PDFRenderer pdfRenderer = new PDFRenderer(doc);
            for (int i = 0; i < pageCount; i++) {
                File targetFile = new File(targetPath + File.separator + name + "-" + (i + 1) + ".jpg");
                if (!targetFile.getParentFile().exists()) {
                    FileUtil.mkdir(targetFile.getParentFile());
                }
                pdfRenderer.renderImage(i);
                BufferedImage image = pdfRenderer.renderImageWithDPI(i, 105, ImageType.RGB);
                ImageIOUtil.writeImage(image, targetFile.getPath(), 105);
                imgList.add(targetFile.getPath());
            }
        } catch (IOException e) {
            log.error("文件转换异常", e);
            throw new RuntimeException("文件转换异常，err=" + e.getMessage());
        }
pdf转成一张图片：
    /**
     * pdf转成一张图片
     *
     * @param pdfFile pdf图片文件
     * @return 图片地址
     */
    public static String pdf2OneImg(File pdfFile) {
        List<String> imgs = pdf2Img(pdfFile);
        int len = imgs.size();
        File[] src = new File[len];
        BufferedImage[] images = new BufferedImage[len];
        int[][] ImageArrays = new int[len][];
        for (int i = 0; i < len; i++) {
            try {
                src[i] = new File(imgs.get(i));
                if (!src[i].exists()) {
                    throw new RuntimeException("文件【" + imgs.get(i) + "】不存在");
                }
                images[i] = ImageIO.read(src[i]);
            } catch (Exception e) {
                log.error("", e);
                throw new RuntimeException(e);
            }
            int width = images[i].getWidth();
            int height = images[i].getHeight();
            // 从图片中读取RGB 像素
            ImageArrays[i] = new int[width * height];
            ImageArrays[i] = images[i].getRGB(0, 0, width, height, ImageArrays[i], 0, width);
        }
        int dst_height = 0;
        int dst_width = images[0].getWidth();
        // 合成图片像素
        for (int i = 0; i < images.length; i++) {
            dst_width = dst_width > images[i].getWidth() ? dst_width : images[i].getWidth();
            dst_height += images[i].getHeight();
        }
        if (dst_height < 1) {
            throw new RuntimeException("文件合成失败，合成后的图片文件高度=" + dst_height);
        }
        String name = pdfFile.getName().substring(0, pdfFile.getName().lastIndexOf("."));
        String targetPath = pdfFile.getParent() + File.separator + name;
        // 输出路径
        File outFile = new File(targetPath + File.separator + name + "-bigone.jpg");
        // 生成新图片
        try {
            dst_width = images[0].getWidth();
            BufferedImage ImageNew = new BufferedImage(dst_width, dst_height, BufferedImage.TYPE_INT_RGB);
            int height_i = 0;
            for (int i = 0; i < images.length; i++) {
                ImageNew.setRGB(0, height_i, dst_width, images[i].getHeight(), ImageArrays[i], 0, dst_width);
                height_i += images[i].getHeight();
            }
            ImageIO.write(ImageNew, "jpg", outFile);
        } catch (Exception e) {
            log.error("图片合并异常=", e);
            throw new RuntimeException(e);
        }
        return outFile.getPath();
    }
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