我的pdfrenderer得到的图片是反的

下边是官方下载的例子 传说中应该是没有问题的 但是我一使用得到的img就是反向的是 注意这个反向是位置没变 但是字颠倒了。。。。

那位大侠给小弟知道一下 万分感激啊！

import java.awt.Color;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.geom.Rectangle2D;
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.lang.reflect.Method;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Date;

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import com.sun.pdfview.PDFFile;
import com.sun.pdfview.PDFPage;

public class ConvertPdfToImg {
public static void changePdfToImg(String pdfpath, String despath) {
   try {
    File file = new File(pdfpath);
    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);
     Rectangle2D rect = new Rectangle(0, 0,
       ((int) page.getBBox() .getWidth()),
       ((int) page.getBBox().getHeight()));
     Image img = page.getImage((int)rect.getWidth(), (int)rect.getHeight(), rect,
       null, // null for the ImageObserver
       true, // fill background with white
       true // block until drawing is done
       );
//     BufferedImage bufferImage = new BufferedImage(100,100,BufferedImage.TYPE_INT_RGB);
//     Graphics2D g2 = bufferImage.createGraphics();
//     g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
//     PDFRenderer renderer = new PDFRenderer(page,g2,new Rectangle(0,0,500,500),null,Color.RED);
//     page.waitForFinish();
//     renderer.run();
     BufferedImage bufferImage = new BufferedImage((int)rect.getWidth(), (int)rect.getHeight(),BufferedImage.TYPE_INT_RGB);
     bufferImage.getGraphics().drawImage(img, 0, 0, Color.WHITE,null);
     FileOutputStream out = new FileOutputStream(despath + i + ".jpg"); // 输出到文件流
     JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
     encoder.encode(bufferImage); // JPEG编码
     out.close();
    }
    channel.close();
    raf.close();
    unmap(buf);//如果要在转图片之后删除pdf，就必须要这个关闭流和清空缓冲的方法
//    JFrame frame = new JFrame("PDF Test");
//         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//         frame.add(new JLabel(new ImageIcon(despath+"1.jpg")));
//         frame.pack();
//         frame.setVisible(true);
   } catch (FileNotFoundException e) {
    e.printStackTrace();
   } catch (IOException e) {
    e.printStackTrace();
   }
}

@SuppressWarnings("unchecked")
public static void unmap(final Object buffer) {
   AccessController.doPrivileged(new PrivilegedAction() {
    public Object run() {
     try {
      Method getCleanerMethod = buffer.getClass().getMethod(
        "cleaner", new Class[0]);
      getCleanerMethod.setAccessible(true);
      sun.misc.Cleaner cleaner = (sun.misc.Cleaner) getCleanerMethod
        .invoke(buffer, new Object[0]);
      cleaner.clean();
     } catch (Exception e) {
      e.printStackTrace();
     }
     return null;
    }
   });
}

public static void main(String[] args) {
   long start = new Date().getTime();
   // TODO code application logic here
   changePdfToImg("F:/孔乙己.pdf", "F:/img/");
   System.out.println(new Date().getTime()-start);
}

}

结果如下