java工具类 PDF转图片

依赖的maven包

       <dependency>
			<groupId>org.icepdf</groupId>
			<artifactId>icepdf-core</artifactId>
			<version>6.3.1</version>
		</dependency>
		<dependency>
			<groupId>org.apache.pdfbox</groupId>
			<artifactId>pdfbox</artifactId>
			<version>2.0.9</version>
		</dependency>

工具类方法

 
public String pdf2ImgWithPdfBox(String url, String folderName,String fileName) {
        log.info("PdfBox开始pdf转图片并上传oss， folderName={}", folderName);
        Document document = new Document();
        try {
            //File file = new File(path);
            InputStream inputStream = new URL(url).openStream();
            PDDocument pdf = PDDocument.load(inputStream);
            PDFRenderer pdfRenderer = new PDFRenderer(pdf);
            PDPageTree pageTree = pdf.getPages();
            int pageCounter = 0;
            for (PDPage page : pageTree) {
                float width = page.getCropBox().getWidth();
                float scale = 2.0f;
                if (width > 720) {
                    scale = 720 / width;
                }
                BufferedImage bim = pdfRenderer.renderImage(pageCounter, scale, ImageType.RGB);
                RenderedImage rendImage = bim;
                ByteArrayOutputStream out = new ByteArrayOutputStream();
                try {
                    ImageIO.write(rendImage, "png", out);
                    ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(out.toByteArray());
                    int size = out.size();
                    String imgUrl = uploadImage(folderName,fileName, byteArrayInputStream,Long.valueOf(size));
                    return imgUrl;
                } catch (IOException e) {
                    log.error("单页PDF转PNG异常：", e);
                }
                pageCounter++;
                bim.flush();
                IOUtils.closeQuietly(out);
                bim = null;
                out = null;
            }
        } catch (Exception e) {
            log.error("pdf转img异常：" , e);
        } finally {
            document.dispose();
        }
        document = null;

        return null;
    }