1、添加依赖

        <dependency>
            <groupId>org.apache.pdfbox</groupId>
            <artifactId>fontbox</artifactId>
            <version>2.0.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.pdfbox</groupId>
            <artifactId>pdfbox</artifactId>
            <version>2.0.1</version>
        </dependency>

2、测试代码

    @Test
    void pdfToImage() throws IOException {
        PDDocument doc = null;
        ByteArrayOutputStream os = null;
        InputStream stream = null;
        OutputStream out = null;
        try {
            // pdf路径
            stream = new FileInputStream("E:\\david\\验收资料手册.pdf");
            // 加载解析PDF文件
            doc = PDDocument.load(stream);
            PDFRenderer pdfRenderer = new PDFRenderer(doc);
            PDPageTree pages = doc.getPages();
            int pageCount = pages.getCount();
            for (int i = 0; i < pageCount; i++) {
                BufferedImage bim = pdfRenderer.renderImageWithDPI(i, 200);
                os = new ByteArrayOutputStream();
                ImageIO.write(bim, "jpg", os);
                byte[] dataList = os.toByteArray();
                // jpg文件转出路径
                String fileName = "E:\\var\\tmp\\hello_" + i + ".jpg";
                System.out.println("file:"+fileName);
                File file = new File(fileName);
                if (!file.getParentFile().exists()) {
                    // 不存在则创建父目录及子文件
                    file.getParentFile().mkdirs();
                    file.createNewFile();
                }
                out = new FileOutputStream(file);
                out.write(dataList);
            }
        } catch (Exception e) {
            e.printStackTrace();
            throw e;
        } finally {
            if (doc != null) doc.close();
            if (os != null) os.close();
            if (stream != null) stream.close();
            if (out != null) out.close();
        }
    }