怎么用itext将PDF文件中的图片提取出来保存到文件中

如何用itext将PDF文件中的图片提取出来保存到文件中?
如何用itext将PDF文件中的图片提取出来保存到文件中?

------解决方案--------------------
PdfReader pdf = new PdfReader("in.pdf");
PdfStamper stp = new PdfStamper(pdf, new FileOutputStream("c:\\out.pdf"));
PdfWriter writer = stp.getWriter();
Image img = Image.getInstance("image.png");
PdfDictionary pg = pdf.getPageN(1);
PdfDictionary res =
(PdfDictionary)PdfReader.getPdfObject(pg.get(PdfName.RESOURCES));
PdfDictionary xobj =
(PdfDictionary)PdfReader.getPdfObject(res.get(PdfName.XOBJECT));
if (xobj != null) {
for (Iterator it = xobj.getKeys().iterator(); it.hasNext(); ) {
PdfObject obj = xobj.get((PdfName)it.next());
if (obj.isIndirect()) {
PdfDictionary tg = (PdfDictionary)PdfReader.getPdfObject(obj);
PdfName type =
(PdfName)PdfReader.getPdfObject(tg.get(PdfName.SUBTYPE));
if (PdfName.IMAGE.equals(type)) {
PdfReader.killIndirect(obj);
Image maskImage = img.getImageMask();
if (maskImage != null)
writer.addDirectImageSimple(maskImage);
writer.addDirectImageSimple(img, (PRIndirectReference)obj);
break;
}
}
}
}
stp.close();

而PdfObject 又有对象STREAM 你只要把stream对象保存成图片即可

具体资料可以查看 http://podofo.sourceforge.net/doc/html/classPoDoFo_1_1PdfStream.html

这个你能看懂么？？ 如果看不懂我稍微解释一下