将PDF进行读取转为图片

public void docToImg() { //// ------------------------------ UploadFile item = getFile("filePdf", SysUtil.getFilePath("/advertorialPdf")); String path = item.getUploadPath() + item.getFileName(); String pdfImgage = PropKit.use("config.properties").get("base_image_path"); SimpleDateFormat sdf = new SimpleDateFormat("YYYYMMDDHHssmm"); //上传的文件 实体类，可用可不用（ 纯属业务 ） FilePdf bean = getBean(FilePdf.class,""); bean.setCreateTime(new Date()); bean.setName(item.getFileName()); bean.setPath(item.getUploadPath()); bean.setCreateUser(ShiroUtils.getUserId()); bean.save(); // Map<String, Object> map = new HashMap<String, Object>(); String pic = ""; // 图片 PDDocument pdf = null; // 获取生成图片的路径 String picPath = null; ImageOutputStream imageout = null; try { // 获取 pdf = PDDocument.load(item.getFile()); // 获取pdf渲染器，主要用来后面获取BufferedImage PDFRenderer renderer = new PDFRenderer(pdf); // 获取pdf文件总页数 int pageCount = pdf.getNumberOfPages(); for (int i = 0; i < pageCount; i++) { //获取file至Image的对象 实体类，根据自己业务需要，也可以不必创建 FilePics pics = getBean(FilePics.class); pics.setFileId(bean.getId()); // 获取当前页对象 PDPage page = pdf.getPage(i); // 构造图片 BufferedImage img_temp = renderer.renderImage(i); // 设置图片格式 Iterator<ImageWriter> it = ImageIO.getImageWritersBySuffix("png"); // 将文件写出 ImageWriter writer = (ImageWriter) it.next(); //生成五位的随机数 String rangNum = ""; for(int j = 0;j<6;j++) { rangNum += String.valueOf(new Random().nextInt(10)); } //图片文件 图片的上传路径+随机数+第几张+图片格式 picPath = item.getUploadPath().replaceAll(".pdf", "") + rangNum + i +".png"; imageout = ImageIO.createImageOutputStream(new FileOutputStream(picPath)); writer.setOutput(imageout); writer.write(new IIOImage(img_temp, null, null)); // pics.setPath(picPath); pics.setSeq(i+1); pics.save(); pic += "," + picPath; imageout.flush(); } //根据上传文件查询此次pdf文件图片的顺序 （ 纯属业务 ） // SQL： Select * from g_file_pics where file_id = ? order by seq asc List<FilePics> picList = FilePics.dao.queryList(bean.getId()); //转化为json字符串 JSONArray json= (JSONArray) JSONArray.toJSON(picList); map.put("pic", pic); map.put("ps", pdfImgage); map.put("json", json); } catch (InvalidPasswordException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { try { imageout.close(); pdf.close(); } catch (IOException e) { e.printStackTrace(); } } renderJson(map); }