java图片转pdf ,pdf 导出

pom引入jar

        
            org.apache.pdfbox
            pdfbox
            2.0.0-RC2
        

转pdf方法

/**
     * 使用pdfbox将jpg转成pdf
     *
     * @throws IOException IOException
     */
    public byte[] jpgToPdf(MultipartFile file) throws IOException {
//        long old = System.currentTimeMillis();
//        System.out.println(" -- 图片转PDF：" + simpleDateFormat.format(old) + " 开始处理 -- " + fileAbsolutePath);

        byte[] pdfBytes = new byte[0]; // PDF Bytes
        InputStream jpgStream = file.getInputStream();
        PDDocument pdDocument = new PDDocument();
        BufferedImage image = ImageIO.read(jpgStream);

        PDPage pdPage = new PDPage(new PDRectangle(image.getWidth(), image.getHeight()));
        pdDocument.addPage(pdPage);
        PDImageXObject pdImageXObject = LosslessFactory.createFromImage(pdDocument, image);
        PDPageContentStream contentStream = new PDPageContentStream(pdDocument, pdPage);
        try {

            contentStream.drawImage(pdImageXObject, 0, 0, image.getWidth(), image.getHeight());
            contentStream.close();
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            PDAcroForm acroForm = pdDocument.getDocumentCatalog().getAcroForm();
            if (acroForm != null) {
                PDTextField field = (PDTextField) acroForm.getField("sampleField");
                field.setValue("Text Entry");
            }

            pdDocument.save(baos);
            pdfBytes = baos.toByteArray();
//        String newFilePath = fileAbsolutePath.substring(0, fileAbsolutePath.lastIndexOf(".")) + ".pdf";
//        pdDocument.save(newFilePath);

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (pdDocument != null) {
                try {
                    pdDocument.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (jpgStream != null) {
                try {
                    jpgStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        long now = System.currentTimeMillis();
//        File file = new File(fileAbsolutePath);
//        boolean delete = file.delete();
//        System.out.println(" -- 图片转PDF处理结束时间：" + " 处理结束 -- 删除原始文件 " + delete);
        return pdfBytes;

    }

导出方法

 @Override
    public String plantPhotoDownload(DvsPlantPhoto dvsPlantPhoto, HttpServletResponse response, HttpServletRequest request) throws Exception {
        DvsPlantPhoto result = this.getOne(new QueryWrapper<>(dvsPlantPhoto));
        if (result != null) {
            String uri = result.getKey();
            BlobServiceClient blobServiceClient = BlobUtils.getBlobServiceClient();
            BlobContainerClient a = BlobUtils.getContainer(blobServiceClient, containerName);
            ByteArrayOutputStream byteArrayOutputStream = BlobUtils.downBlobFilecao(a, uri);
//            return Base64.getEncoder().encodeToString(aa);

            ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(byteArrayOutputStream.toByteArray());

            response.setCharacterEncoding(request.getCharacterEncoding());
            response.setContentType("application/pdf");
            try {
                response.setHeader("Content-Disposition", "attachment; filename=" + result.getKey());
                IOUtils.copy(byteArrayInputStream, response.getOutputStream());
                response.flushBuffer();
            } catch (Exception e) {
                log.error(e.getMessage(), e);
            } finally {
                if (byteArrayInputStream != null) {
                    try {
                        byteArrayInputStream.close();
                    } catch (IOException e) {
                        log.error(e.getMessage(), e);
                    }
                }
                if (byteArrayOutputStream != null) {
                    try {
                        byteArrayOutputStream.close();
                    } catch (IOException e) {
                        log.error(e.getMessage(), e);
                    }
                }
            }
            return new JSONObject().toJSONString();
        } else {
            return new JSONObject().toJSONString();
        }
    }