public static List
    
      getSignature(String pdfFile) throws IOException {        PDDocument document = PDDocument.load(new File(pdfFile));        List
     
       signModelList = new ArrayList
      
       ();        List
       
         fields = document.getSignatureFields();        for(PDSignatureField f:fields){            PDAnnotationWidget  widget = f.getWidgets().get(0);            String name = f.getFullyQualifiedName();            PDPage pdPage = widget.getPage();            int page = 0;            for(int i = 0;i < document.getNumberOfPages();i++){                PDPage p = document.getPage(i);                if(p.equals(pdPage)){                    page = i;                    break;                }            }            PDRectangle pdRectangle = widget.getRectangle();            signModelList.add(new PDFAreaModel(name, page,(int)pdRectangle.getLowerLeftX(), (int)pdRectangle.getLowerLeftY(), (int)pdRectangle.getWidth(),(int)pdRectangle.getHeight(), f.getSignature()!=null));        }        return signModelList;    }