使用pdfbox实现PDF转JPG

1. 引入依赖

<dependency>
   <groupId>org.apache.pdfbox</groupId>
    <artifactId>pdfbox</artifactId>
    <version>1.7.1</version>
</dependency>
<dependency>
    <groupId>org.apache.pdfbox</groupId>
    <artifactId>fontbox</artifactId>
    <version>1.7.1</version>
</dependency>

2. 实现简单的PDF转JPG

public static void main(String[] args) {

        String pdfFilePath = "D:/aaa.pdf";//pdf文件路径
        String destFormat = "jpg";//最终希望PDF文件转成的文件格式
        int dpi = 144;//pdi越大，图片越清晰，生成的图片也越大
        File file = new File(pdfFilePath);
        String destDirFile = "D:/";//最终jpg图片生成保存的目录
        PDDocument doc = null;
        int num = 1;
        try {
            doc = PDDocument.load(file);
            List<PDPage> pages = doc.getDocumentCatalog().getAllPages();//获取到当前PDF内的总页数
            for (int i = 0; i < pages.size(); i++) {
                PDPage page = pages.get(i);
                //生成彩色的图，想生成黑白的图可以改变“TYPE_3BYTE_BGR”处的值
                BufferedImage image = page.convertToImage(BufferedImage.TYPE_3BYTE_BGR, dpi);
                //获取PDF名->aaa.pdf
                String pdfName = pdfFilePath.substring(pdfFilePath.lastIndexOf("/") + 1);
                //拼接生成的图片路径->D:/destDir/aaa-1.jpg
                String destPath = destDirFile + pdfName.substring(0, pdfName.lastIndexOf(".")) + "-" + num++ + "." + destFormat;
                File destDirFiles = new File(destPath);
                if (!destDirFiles.exists()) {
                    destDirFiles.mkdirs();
                }
                File jpgFile = new File(destPath);
                ImageIO.write(image, destFormat, jpgFile);//生成图片
            }


        } finally {
            if (doc != null) {
                doc.close();
            }
        }

    }