工程加入依赖：
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< 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：
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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：
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/** * 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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原文链接：https://blog.csdn.net/tanzhming/article/details/117930788