pdf转图片的工具类

1、需要引入的包

<dependency><groupId>org.apache.pdfbox</groupId><artifactId>pdfbox</artifactId><version>2.0.4</version></dependency>

2、工具类

public static void main(String[] args) {String path="D://test/21.pdf";String outpath="D://filesdata/21.png";pdfToImage(path,outpath);
}public static List<String> pdfToImage(String path, String outpath) {int DPI = 130;try {Path pdfPath = Paths.get(path);byte[] bytes = Files.readAllBytes(pdfPath);PDDocument doc = PDDocument.load(bytes);int pageCount = doc.getNumberOfPages();/* log.info("PDF转图片流，总页数:{}", pageCount);*/PDFRenderer pdfRenderer = new PDFRenderer(doc);// 不知道图片的宽和高，所以先定义个nullBufferedImage pdfImage = null;// pdf有多少页int y = 0;List<BufferedImage> list = new ArrayList<>(pageCount);// 所有页高度综合int totalHeight = 0;if (pageCount > 0) {for (int i = 0; i < pageCount; i++) {// 每页pdf内容BufferedImage bim = pdfRenderer.renderImageWithDPI(i, DPI, ImageType.RGB);totalHeight += bim.getHeight();list.add(bim);}}System.out.println(list.size());List<String> picList = new ArrayList<>();int i = 1;for (BufferedImage bim : list) {// 如果是第一页需要初始化 BufferedImageif (bim != null) {String out = outpath + i + ".png";ByteArrayOutputStream baos = new ByteArrayOutputStream();ImageIO.write(bim, "png", baos);baos.flush();byte[] imageInByte = baos.toByteArray();File file = new File(out);//打开输入流FileImageOutputStream imageOutput = new FileImageOutputStream(file);//将byte写入硬盘imageOutput.write(imageInByte, 0, imageInByte.length);imageOutput.flush();imageOutput.close();picList.add(out);i++;}}doc.close();return picList;} catch (Exception e) {return null;}
}