pdf 转png 多页pdf转一张png aspose pdf jar

/**
 * 将pdf转图片
 */
public static void pdfToImageInputStream inputStream, File imgFile) {
    try {
        long old = System.currentTimeMillis);
        System.out.println"begin..............");
        Document pdfDocument = new DocumentinputStream);
        Resolution resolution = new Resolution130);
        JpegDevice jpegDevice = new JpegDeviceresolution);
        List<BufferedImage> imageList = new ArrayList<BufferedImage>);
        List<File> fileList = new ArrayList<>);
        for int index = 1; index <= pdfDocument.getPages).size); index++) {
            File file = File.createTempFile"tempFile", "png");
            FileOutputStream fileOS = new FileOutputStreamfile);
            jpegDevice.processpdfDocument.getPages).get_Itemindex), fileOS);
            fileOS.close);
            imageList.addImageIO.readfile));
            fileList.addfile);
        }
        //临时文件删除
        BufferedImage mergeImage = mergeImagefalse, imageList);
        ImageIO.writemergeImage, "png", imgFile);
        long now = System.currentTimeMillis);
        System.out.println"共耗时：" + now - old) / 1000.0) + "秒");
        //删除临时文件
        for File f : fileList) {
            f.delete);
        }
    } catch Exception e) {
        e.printStackTrace);
    }

}

/**
 * 合并任数量的图片成一张图片
 *
 * @param isHorizontal true代表水平合并，fasle代表垂直合并
 * @param imgs         待合并的图片数组
 * @return
 * @throws IOException
 */
public static BufferedImage mergeImageboolean isHorizontal, List<BufferedImage> imgs) throws IOException {
    // 生成新图片
    BufferedImage destImage = null;
    // 计算新图片的长和高
    int allw = 0, allh = 0, allwMax = 0, allhMax = 0;
    // 获取总长、总宽、最长、最宽
    for int i = 0; i < imgs.size); i++) {
        BufferedImage img = imgs.geti);
        allw += img.getWidth);

        if imgs.size) != i + 1) {
            allh += img.getHeight) + 5;
        } else {
            allh += img.getHeight);
        }


        if img.getWidth) > allwMax) {
            allwMax = img.getWidth);
        }
        if img.getHeight) > allhMax) {
            allhMax = img.getHeight);
        }
    }
    // 创建新图片
    if isHorizontal) {
        destImage = new BufferedImageallw, allhMax, BufferedImage.TYPE_INT_RGB);
    } else {
        destImage = new BufferedImageallwMax, allh, BufferedImage.TYPE_INT_RGB);
    }
    Graphics2D g2 = Graphics2D) destImage.getGraphics);
    g2.setBackgroundColor.LIGHT_GRAY);
    g2.clearRect0, 0, allw, allh);
    g2.setPaintColor.RED);

    // 合并所有子图片到新图片
    int wx = 0, wy = 0;
    for int i = 0; i < imgs.size); i++) {
        BufferedImage img = imgs.geti);
        int w1 = img.getWidth);
        int h1 = img.getHeight);
        // 从图片中读取RGB
        int[] ImageArrayOne = new int[w1 * h1];
        // 逐行扫描图像中各个像素的RGB到数组中
        ImageArrayOne = img.getRGB0, 0, w1, h1, ImageArrayOne, 0, w1);
        if isHorizontal) {
            // 水平方向合并
            // 设置上半部分或左半部分的RGB
            destImage.setRGBwx, 0, w1, h1, ImageArrayOne, 0, w1);
        } else {
            // 垂直方向合并
            // 设置上半部分或左半部分的RGB
            destImage.setRGB0, wy, w1, h1, ImageArrayOne, 0, w1);
        }
        wx += w1;
        wy += h1 + 5;
    }


    return destImage;
}