PDF转JPG

public String changePdfToImage(String filePath1,String appId) throws Exception{
    String imgUrl=null;
    String tempDirPath = System.getProperty("java.io.tmpdir") + "/tclLoanPz/"+appId;

    File tempDir = new File(tempDirPath);
    if (!tempDir.exists()) {
        tempDir.mkdirs();
    }
    String filePath = tempDirPath + "/"+appId+".pdf";
    //下载文件到本地
    downloadFile(filePath1, filePath);
    try(InputStream stream = new FileInputStream(filePath);
        PDDocument doc = PDDocument.load(stream);
        ByteArrayOutputStream os = new ByteArrayOutputStream();) {
        String imgFileName="/"+appId+".jpg";
        // 加载解析PDF文件
        PDFRenderer pdfRenderer = new PDFRenderer(doc);
        PDPageTree pages = doc.getPages();
        File file = new File(tempDirPath+imgFileName);
        int pageCount = pages.getCount();
        for (int i = 0; i < pageCount; i++) {
            BufferedImage bim = pdfRenderer.renderImageWithDPI(i, 200);
            ImageIO.write(bim, "jpg", os);
            byte[] dataList = os.toByteArray();
            // jpg文件转出路径
            if (!file.getParentFile().exists()) {
                // 不存在则创建父目录及子文件
                file.getParentFile().mkdirs();
                file.createNewFile();
            }
            try(OutputStream out=new FileOutputStream(file);) {
                out.write(dataList);
            }catch (Exception ex){
                throw new FundException("转换文件异常");
            }
        }
        if(file.exists()){
            String imgPath=file.getPath();
            imgUrl = fileUpload.uploadFile(imgPath);
        }
        return imgUrl;
    } catch (Exception e) {
        throw new FundException(appId+"pdf转换成图片异常："+e.getMessage());
    } finally {
        File tempFile = new File(tempDirPath);
        if (tempFile.exists()) {
            tempFile.deleteOnExit();
        }
    }
}

public static boolean downloadFile(String remoteFilePath, String localFilePath) {
    logger.info("资源downloadFile: " + remoteFilePath + "下载to:" + localFilePath);
    URL urlfile = null;
    disableSslVerification();
    HttpURLConnection httpUrl = null;
    BufferedInputStream bis = null;
    BufferedOutputStream bos = null;
    File f = new File(localFilePath);
    try {
        urlfile = new URL(remoteFilePath);
        httpUrl = (HttpURLConnection) urlfile.openConnection();
        httpUrl.connect();
        bis = new BufferedInputStream(httpUrl.getInputStream());
        bos = new BufferedOutputStream(new FileOutputStream(f));
        int len = 2048;
        byte[] b = new byte[len];
        while ((len = bis.read(b)) != -1) {
            bos.write(b, 0, len);
        }
        bos.flush();
        bis.close();
        httpUrl.disconnect();
        System.out.println("成功");
        return true;
    } catch (Exception e) {
        httpUrl.disconnect();
        logger.info("资源路径:（" + remoteFilePath + "）下载至：（" + localFilePath + " ）发生异常错误：" + e.getMessage(), e);
        System.out.println("错误");
        return false;
    } finally {
        try {
            if (bis != null) {
                bis.close();
            }
            if (bos != null) {
                bos.close();
            }
        } catch (Exception e) {
            logger.error(e.getMessage(), e);
            System.out.println("错误");
        }
    }
}