关于pdf:Pdf-转换-图片

PDDocument document = null;
        String pdfdir = "d:/pdf2image/";
        File file = new File(pdfdir);
        if(!file.exists()||!file.isDirectory()){System.out.println("the diretory is not exist");
            return;
        }
        File [] files = file.listFiles();
        for(File pdf :files){String filepath = pdf.getAbsolutePath();
            if(!filepath.contains(".pdf")){continue;}
            String filename = pdf.getName();
            String imageNamePrefix = filename.substring(0,filename.lastIndexOf("."));

            File imagedir = new File(pdfdir+imageNamePrefix);
            if(!imagedir.exists()){imagedir.mkdir();
            }
            InputStream inputStream = new FileInputStream(pdf);
            document = PDDocument.load(inputStream);
            PDFRenderer renderer = new PDFRenderer(document);
            int pageCount = document.getNumberOfPages();
            System.out.println("共"+pageCount+"页.");
            for (int i = 0; i < pageCount; i++) {BufferedImage image = renderer.renderImage(i, 1.9f);
                ImageIO.write(image, "jpg", new File(pdfdir+imageNamePrefix+File.separator+ i + ".jpg"));
            }
        }

<dependency>
            <groupId>org.apache.pdfbox</groupId>
            <artifactId>pdfbox</artifactId>
            <version>2.0.18</version>
        </dependency>