java-使用icepdf实现pdf转换成png

下载icepdf的架包，并导入项目中，这里用到4个，如下：

/**
     * 本地pdf文件转png
     */
    public static int pdf2pngByFile(String target){
        String filePath = target;
        Document document = new Document();
//        System.out.println("开始转png");
        try {
            document.setFile(filePath);
            float scale = 1.5f;// 缩放比例（大图）
            // float scale = 0.2f;// 缩放比例（小图）
            float rotation = 0f;// 旋转角度
            int pageSize = document.getNumberOfPages();
            for (int i = 0; i < document.getNumberOfPages(); i++) {
                BufferedImage image = (BufferedImage) document.getPageImage(i, GraphicsRenderingHints.SCREEN,
                        org.icepdf.core.pobjects.Page.BOUNDARY_CROPBOX, rotation, scale);
                RenderedImage rendImage = image;
//                try {
//                    File file = new File("D:/fileUpload/ftpDownload/icepdf_a" + i + ".png");
//                    // 这里png作用是：格式是jpg但有png清晰度
//                    ImageIO.write(rendImage, "png", file);
//                } catch (IOException e) {
//                    e.printStackTrace();
//                }
                try {
//                    WebApplicationContext webApplicationContext = ContextLoader.getCurrentWebApplicationContext();
//                    ServletContext servletContext = webApplicationContext.getServletContext();
//                    File contextPath = new File(servletContext.getRealPath("/")); // 项目根目录
//                    File uploadPath = new File(
//                            contextPath.getParentFile().getAbsoluteFile() + File.separator + "uploadFiles"); // 上传图片存放目录
                    File uploadPath = new File(target);
                    String fileName = getPathWithName(target);
                    File file1 = new File(fileName);
                    if (!file1.exists()) {
                        file1.mkdirs();
                    }
//                    System.out.println("地址=" + uploadPath.getAbsolutePath() + "/icepdf_a" + i + ".png" + "\n");
                    File file = new File(fileName + "\\" + i + ".png");
                    // 这里png作用是：格式是jpg但有png清晰度
                    ImageIO.write(rendImage, "png", file);

                } catch (IOException e) {
                    e.printStackTrace();
                }
                image.flush();
            }
            document.dispose();
            System.out.println("png_ok");
            System.out.println("pageSize="+pageSize);
            return pageSize;
        } catch (Exception e1) {
            e1.printStackTrace();
        }
        return 0;
    }

参考：

http://www.cnblogs.com/pcheng/p/5704470.html