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https://issues.apache.org/jira/browse/PDFBOX-6179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18067217#comment-18067217
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Tilman Hausherr commented on PDFBOX-6179:
-----------------------------------------
I didn't read the last comment this morning and so while writing the following
code I was surprised that PDAnnotation has an equals method. Anyway, the
following code would work on your file:
{code:java}
public class RemoveField
{
public static void main(String[] args) throws IOException
{
String name = "XXXX";
String dir = .......
try (PDDocument doc = Loader.loadPDF(new File(dir,
"PDFBOX-6179-form.pdf")))
{
PDAcroForm acroForm = doc.getDocumentCatalog().getAcroForm();
PDField field = acroForm.getField(name);
if (field == null)
{
System.out.println("field not found");
doc.close();
return;
}
List<PDField> fields = acroForm.getFields(); // not the best method
because it returns only top level
boolean removed = false;
for (int i = 0; i < fields.size(); ++i)
{
if (fields.get(i).getCOSObject().equals(field.getCOSObject()))
{
fields.remove(i);
removed = true;
break;
}
}
System.out.println("field removed? " + removed);
if (removed)
{
// find page(s)
List<PDAnnotationWidget> widgets = field.getWidgets();
for (PDAnnotationWidget widget : widgets)
{
PDPage page = widget.getPage(); // not always set
List<PDAnnotation> annotations = page.getAnnotations();
removed = annotations.remove(widget);
System.out.println("page widget removed? " + removed);
}
}
doc.save(new File(dir, "PDFBOX-6179-form-saved.pdf"));
}
}
}
{code}
A generally working code would need to call getFieldTree() and check on the
kids. However what is the use case on removing a single field?
> Removing fields not possible
> ----------------------------
>
> Key: PDFBOX-6179
> URL: https://issues.apache.org/jira/browse/PDFBOX-6179
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm
> Affects Versions: 3.0.7 PDFBox
> Reporter: Stefan Ziegler
> Priority: Major
> Attachments: simple_form.pdf
>
>
> Seems that fields can no longer be removed like this:
> PDField field = acroForm.getField("XXXXX");
> List<PDField> fields = acroForm.getFields();
> fields.remove(field);
> Internally, the field is never found. PDField has no equals method. getField
> and getFields create new PDField instances and so equals fails in this case.
> Shouldn't there be an equals method in PDField, that compares the underlying
> COSObject?
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