java pdf转png

向右看齐 2022-07-15 00:16 261阅读 0赞

package zh.demo.pdfDemo;
    
    import java.awt.Image;
    import java.awt.Rectangle;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.RandomAccessFile;
    import java.nio.MappedByteBuffer;
    import java.nio.channels.FileChannel;
    
    import javax.imageio.ImageIO;
    
    import com.sun.pdfview.PDFFile;
    import com.sun.pdfview.PDFPage;
    
    /** * pdf 转png/jpg类 * * @author zhangheng * @date 2016年10月26日下午1:36:55 * */
    public class PdfDemo {
    
        public static void main(String[] args) {
            PdfDemo.changePdfToImg();
        }
    
        private static void changePdfToImg() {
            try {
                File file = new File("D:\\demo.pdf");
                RandomAccessFile raf = new RandomAccessFile(file, "r");
                FileChannel channel = raf.getChannel();
                MappedByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());
                PDFFile pdffile = new PDFFile(buf);
                for (int i = 1; i <= pdffile.getNumPages(); i++) { 
                    PDFPage page = pdffile.getPage(i);
                    Rectangle rect = new Rectangle(0, 0, ((int) page.getBBox().getWidth()),
                            ((int) page.getBBox().getHeight()));
                    Image img = page.getImage(rect.width, rect.height, rect, null, true, true);
                    BufferedImage tag = new BufferedImage(rect.width, rect.height, BufferedImage.TYPE_INT_RGB);
                    tag.getGraphics().drawImage(img, 0, 0, rect.width, rect.height, null);
                    FileOutputStream out = new FileOutputStream("D:\\demo" + i + ".jpg"); // 输出到文件流
                    ImageIO.write(tag, "jpg", out);
                    out.close();
                }
                channel.close();
                raf.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }