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