pdf文件转图片，base64或保存到本地

pdf转图片，需要引入pdfbox依赖

<dependency><groupId>org.apache.pdfbox</groupId><artifactId>pdfbox</artifactId><version>2.0.27</version>
</dependency>

@RequestMapping("pdfToImg")
public void pdfToImg(){PDDocument document = null;InputStream inputStream = null;ByteArrayOutputStream outputStream = null;try{inputStream = new FileInputStream(new File("F:\\贴纸.pdf"));document = PDDocument.load(inputStream);PDFRenderer renderer = new PDFRenderer(document);int pageSize = document.getNumberOfPages();String text = "";// 一页一页读取outputStream = new ByteArrayOutputStream();for (int i = 0; i < pageSize; i++) {//每一页通过分辨率和颜色值进行转化BufferedImage bufferedImage = renderer.renderImageWithDPI(i, 300);//    ImageIO.write(bufferedImage,"png",new File("F:\\下载\\img_"+i+".png"));ImageIO.write(bufferedImage,"png",outputStream);outputStream.flush();}byte[] imagesBytes = outputStream.toByteArray();String imageBase64 = Base64.getEncoder().encodeToString(imagesBytes);System.out.println(imageBase64);}catch (Exception e){System.out.println(e.getMessage());}finally {try {if (document != null) {document.close();}if(inputStream != null){inputStream.close();}if(outputStream != null){outputStream.close();}} catch (IOException e) {System.out.println(e.getMessage());}}
}