java 循环文件夹读取PDF，并转换成jpg

package pdf;

import java.awt.Image;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
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 PdfToJpgTest {
 public static void setup(File file) throws IOException {
  // load a pdf from a byte buffer
  /*File file = new File(
    "c://xxxxx.pdf");*/
  RandomAccessFile raf = new RandomAccessFile(file, "r");
  FileChannel channel = raf.getChannel();
  ByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel
    .size());
  PDFFile pdffile = new PDFFile(buf);

System.out.println("页数： " + pdffile.getNumPages());

for (int i = 1; i <= pdffile.getNumPages(); i++) {
   // draw the first page to an image
   PDFPage page = pdffile.getPage(i);

// get the width and height for the doc at the default zoom
   Rectangle rect = new Rectangle(0, 0, (int) page.getBBox()
     .getWidth(), (int) page.getBBox().getHeight());

// generate the image
   Image img = page.getImage(rect.width, rect.height, // width &
                // height
     rect, // clip rect
     null, // null for the ImageObserver
     true, // fill background with white
     true // block until drawing is done
     );

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(
     "C:/Users/Bonnie/Desktop/内容发布/img/"+file.getName()+ i + ".jpg"); // 输出到文件流
   JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
   encoder.encode(tag); // JPEG编码

out.close();
  }

// show the image in a frame
  // JFrame frame = new JFrame("PDF Test");
  // frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  // frame.add(new JLabel(new ImageIcon(img)));
  // frame.pack();
  // frame.setVisible(true);
 }
  public static void showAllFiles(File dir) throws Exception{
    int pdfCount=0;
      File[] fs = dir.listFiles();
      for(int i=0; i<fs.length; i++){
        if(fs[i].isDirectory()){
            try{
             showAllFiles(fs[i]);
            }catch(Exception e){}
        }else{
         String ffHouZhui=fs[i].getName().substring(fs[i].getName().lastIndexOf(".")+1,fs[i].getName().length());//后缀名
         if(ffHouZhui.equals("pdf")){//pdf文件
          pdfCount++;
          System.out.println(pdfCount+">>>>>>>>>"+fs[i].getName());    
          setup(fs[i]);
         }
        }
      }
   }
 public static void main(final String[] args) {
     //递归显示C盘下所有文件夹及其中文件
        File root = new File("C:/Users/Bonnie/Desktop/内容发布");
     try {
      showAllFiles(root);
     } catch (Exception e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
     }
 }

}

备注：com.sun.pdfview，jar包需要下载