Help with iText code

honestly, know little itext , how use it. i'm novice @ cf. have been searching way change image of button in existing pdf file. found code sample, it's on head.

if can me work in cf, appreciate it:

pdfreader pdf = new pdfreader("in.pdf");
pdfstamper stp = new pdfstamper(pdf, new fileoutputstream("out.pdf"));
pdfwriter writer = stp.getwriter();
image img = image.getinstance("image.png");
acrofields af = stp.getacrofields();
acrofields.item item = af.getfielditem("button1");
pdfdictionary dic = (pdfdictionary)item.widgets.get(0);
dic = (pdfdictionary)pdfreader.getpdfobject(dic.get(pdfname.ap));
dic = (pdfdictionary)pdfreader.getpdfobject(dic.get(pdfname.n));
dic = (pdfdictionary)pdfreader.getpdfobject(dic.get(pdfname.resources));
dic = (pdfdictionary)pdfreader.getpdfobject(dic.get(pdfname.xobject));
dic = (pdfdictionary)pdfreader.getpdfobject(dic.get(pdfname.frm));
dic = (pdfdictionary)pdfreader.getpdfobject(dic.get(pdfname.resources));
dic = (pdfdictionary)pdfreader.getpdfobject(dic.get(pdfname.xobject));
pdfobject obj = dic.get((pdfname)dic.getkeys().iterator().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);
}
}
stp.close();

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