工程加入依赖：
<dependency><groupId>org.apache.pdfbox</groupId><artifactId>pdfbox</artifactId><version>2.0.15</version></dependency><dependency><groupId>org.apache.pdfbox</groupId><artifactId>pdfbox-tools</artifactId><version>2.0.15</version></dependency>
pdf文件转图片：
public static List<String> pdf2Img(File pdfFile) { if (pdfFile == null || !pdfFile.exists()) { throw new RuntimeException("pdf文件不能为空"); } String name = pdfFile.getName().substring(0, pdfFile.getName().lastIndexOf(".")); String targetPath = pdfFile.getParent() + File.separator + name; List<String> imgList = new ArrayList<>(); try { PDDocument doc = PDDocument.load(pdfFile); // 页数 int pageCount = doc.getNumberOfPages(); PDFRenderer pdfRenderer = new PDFRenderer(doc); for (int i = 0; i < pageCount; i++) { File targetFile = new File(targetPath + File.separator + name + "-" + (i + 1) + ".jpg"); if (!targetFile.getParentFile().exists()) { FileUtil.mkdir(targetFile.getParentFile()); } pdfRenderer.renderImage(i); BufferedImage image = pdfRenderer.renderImageWithDPI(i, 105, ImageType.RGB); ImageIOUtil.writeImage(image, targetFile.getPath(), 105); imgList.add(targetFile.getPath()); } } catch (IOException e) { log.error("文件转换异常", e); throw new RuntimeException("文件转换异常，err=" + e.getMessage()); }
pdf转成一张图片：
/** * pdf转成一张图片 * * @param pdfFile pdf图片文件 * @return 图片地址 */ public static String pdf2OneImg(File pdfFile) { List<String> imgs = pdf2Img(pdfFile); int len = imgs.size(); File[] src = new File[len]; BufferedImage[] images = new BufferedImage[len]; int[][] ImageArrays = new int[len][]; for (int i = 0; i < len; i++) { try { src[i] = new File(imgs.get(i)); if (!src[i].exists()) { throw new RuntimeException("文件【" + imgs.get(i) + "】不存在"); } images[i] = ImageIO.read(src[i]); } catch (Exception e) { log.error("", e); throw new RuntimeException(e); } int width = images[i].getWidth(); int height = images[i].getHeight(); // 从图片中读取RGB 像素 ImageArrays[i] = new int[width * height]; ImageArrays[i] = images[i].getRGB(0, 0, width, height, ImageArrays[i], 0, width); } int dst_height = 0; int dst_width = images[0].getWidth(); // 合成图片像素 for (int i = 0; i < images.length; i++) { dst_width = dst_width > images[i].getWidth() ? dst_width : images[i].getWidth(); dst_height += images[i].getHeight(); } if (dst_height < 1) { throw new RuntimeException("文件合成失败，合成后的图片文件高度=" + dst_height); } String name = pdfFile.getName().substring(0, pdfFile.getName().lastIndexOf(".")); String targetPath = pdfFile.getParent() + File.separator + name; // 输出路径 File outFile = new File(targetPath + File.separator + name + "-bigone.jpg"); // 生成新图片 try { dst_width = images[0].getWidth(); BufferedImage ImageNew = new BufferedImage(dst_width, dst_height, BufferedImage.TYPE_INT_RGB); int height_i = 0; for (int i = 0; i < images.length; i++) { ImageNew.setRGB(0, height_i, dst_width, images[i].getHeight(), ImageArrays[i], 0, dst_width); height_i += images[i].getHeight(); } ImageIO.write(ImageNew, "jpg", outFile); } catch (Exception e) { log.error("图片合并异常=", e); throw new RuntimeException(e); } return outFile.getPath(); }
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而消极的人则在每个机会都看到某种忧患。
