java springboot实现图片转换pdf，ofd并下载

目录

依赖

导包

图片转换ofd

文件转换pdf

下载文件

---

依赖

        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>itextpdf</artifactId>
            <version>5.5.13</version>
        </dependency>

        <dependency>
            <groupId>org.ofdrw</groupId>
            <artifactId>ofdrw-full</artifactId>
            <version>1.17.0</version>
        </dependency>

导包

import java.nio.charset.StandardCharsets;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Image;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.pdf.PdfWriter;
import org.apache.commons.lang3.StringUtils;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletResponse;
import java.io.*;

图片转换ofd

/**
     * 将图片转换为OFD文件
     *
     * @param file 上传的图片文件
     * @param revolve 图片是否旋转，为空默认不旋转 
     * @return 
     * @throws IOException       IO异常
     */
    private static File generateOfdFile(MultipartFile file, Boolean revolve) throws IOException {
        String fileName = file.getOriginalFilename();
        String ofdFilePath = path + File.separator + fileName.substring(0, fileName.lastIndexOf(".")) + ".ofd";
        Path OfdPath = Paths.get(ofdFilePath).toAbsolutePath();
        try (OFDDoc ofdDoc = new OFDDoc(OfdPath)) {
            PageLayout pageLayout = ofdDoc.getPageLayout();
            VirtualPage vPage = new VirtualPage(pageLayout);
            Image image = Image.getInstance(file.getBytes());
            float height = image.getHeight();
            float width = image.getWidth();
            if (revolve != null && revolve) {
                BufferedImage src = ImageIO.read(file.getInputStream());
                BufferedImage des1 = RotateImage.Rotate(src, 90);
                ImageIO.write(des1, FilenameUtils.getExtension(fileName).toLowerCase(), new File(path + "/" + fileName));
                float temp = height;
                height = width;
                width = temp;
            }

            Path imgPath = Paths.get(path, fileName);
            Img img;

            if (height / width > pageLayout.getHeight() / pageLayout.getWidth()) {
                //上下顶头
                img = new Img((pageLayout.getHeight() - 20) * width / height, pageLayout.getHeight() - 20, imgPath);
            } else {
                //左右顶头
                img = new Img((pageLayout.getWidth() - 20), (pageLayout.getWidth() - 20) / width * height, imgPath);
            }
            double x = (pageLayout.getWidth() - img.getWidth()) / 2;
            double y = (pageLayout.getHeight() - img.getHeight()) / 2;
            img.setPosition(Position.Absolute).setX(x).setY(y);
            vPage.add(img);
            ofdDoc.addVPage(vPage);
        } catch (BadElementException e) {
            e.printStackTrace();
        }
        File ofdFile = new File(ofdFilePath);
        return ofdFile;
    }

文件转换pdf

/**
     * 将图片转换为PDF文件
     *
     * @param file上传的图片文件
     * @param revolve 是否旋转图片
     * @return PDF文件
     * @throws IOException       IO异常
     * @throws DocumentException PDF文档异常
     */
    private static File generatePdfFile(MultipartFile file,Boolean revolve) throws IOException, DocumentException {
        String fileName = file.getOriginalFilename();
        String pdfFileName = fileName.substring(0, fileName.lastIndexOf(".")) + ".pdf";
        Document doc = new Document(PageSize.A4, 20, 20, 20, 20);
        PdfWriter.getInstance(doc, new FileOutputStream(pdfFileName));
        doc.open();
        doc.newPage();
        Image image = Image.getInstance(file.getBytes());
        float height = image.getHeight();
        float width = image.getWidth();
        int percent = 0;
        if(revolve==null||!revolve){
            percent = getPercent(height,width);
        }else {
            image.setRotationDegrees(90);
            percent = getPercent(width,height);
        }
        image.setAlignment(Image.MIDDLE);
        image.scalePercent(percent);
        doc.add(image);
        doc.close();
        return new File(pdfFileName);
    }



    private static int getPercent(float height, float weight) {
        float percent = 0.0F;
        if (height > weight) {
            percent = (PageSize.A4.getHeight()-40) / height * 100;
        } else {
            percent = (PageSize.A4.getWidth()-40) / weight * 100;
        }
        return Math.round(percent);

    }

下载文件

/**
     * 用于下载OFD文件
     *
     * @param ofdFile  OFD文件
     * @param response HttpServletResponse
     * @throws IOException IO异常
     */
    private static void downloadOfdFile(File ofdFile, HttpServletResponse response, String name) throws IOException {
        FileInputStream fis = new FileInputStream(ofdFile);
        byte[] bytes = new byte[fis.available()];
        fis.read(bytes);
        fis.close();
        response.reset();
        response.setHeader("Content-Type", "application/ofd");
        response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(name, "UTF-8"));
        OutputStream out = response.getOutputStream();
        out.write(bytes);
        out.flush();
        out.close();
    }