java将图片转化为pdf并输出

本是古典何须时尚 2023-10-11 22:59 41阅读 0赞

1.导入依赖

<dependency>
        <groupId>org.apache.pdfbox</groupId>
        <artifactId>pdfbox</artifactId>
        <version>2.0.19</version>
    </dependency>

import org.apache.pdfbox.pdmodel.PDDocument;
    import org.apache.pdfbox.pdmodel.PDPage;
    import org.apache.pdfbox.pdmodel.PDPageContentStream;
    import org.apache.pdfbox.pdmodel.common.PDRectangle;
    import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;

2.在桌面准备一张图片a.png,定位并转化为multipartFile

@Test
    public void testPdf() throws Exception{
    
        boolean is = false;
    
        File file = new File("C:\\Users\\scz\\Desktop\\a.png");
    
        FileInputStream fileInputStream = new FileInputStream(file);
    
        MultipartFile multipartFile = new MockMultipartFile("copy"+file.getName(),file.getName(), ContentType.APPLICATION_OCTET_STREAM.toString(),fileInputStream);
    
        try {
            PDDocument document = new PDDocument();
    
           /* PDPage page = new PDPage();
            PDRectangle rectangle = new PDRectangle(468, 450);
            page.setMediaBox(rectangle);*/
    //这里是设置pdf的大小,大小固定,所有不推荐,下面是根据图片大小动态生成pdf大小
    
            String filename = multipartFile.getOriginalFilename();
            String fileSuffix = filename.substring(filename.lastIndexOf(".") + 1);
    
            Iterator readers = ImageIO.getImageReadersByFormatName(fileSuffix);
            ImageReader reader = (ImageReader) readers.next();
            ImageInputStream input = ImageIO.createImageInputStream(multipartFile.getInputStream());
            reader.setInput(input, true);
    
            int width = reader.getWidth(0)+300;
            int height = reader.getHeight(0)+500;
            PDPage pdPage = new PDPage(new PDRectangle(width, height));
    //根据图片大小动态生成pdf大小
    
            document.addPage(pdPage);
            PDImageXObject pdImageXObject = PDImageXObject.createFromByteArray(document, multipartFile.getBytes(), "构建图片错误");
    
            PDPageContentStream contentStream = new PDPageContentStream(document, pdPage);
            //写入图片
            contentStream.drawImage(pdImageXObject, 0, 0);
            contentStream.close();
    
            document.save("C:\\Users\\scz\\Desktop\\1.pdf");
    
    //pdf输出
            document.close();
    
            is = true;
        } catch (Exception e) {
            is = false;
        }
    
        System.out.println(is);
    }

3.最后会在桌面输出一个1.pdf

注意:桌面的路径要改成自己的