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https://issues.apache.org/jira/browse/PDFBOX-2419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14185117#comment-14185117
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Laurent Richard commented on PDFBOX-2419:
-----------------------------------------
The problem is specific to XML format XFDF where special characters should be
escaped. There's no issue with FDF.
I join a sample PDF file with simple AcroForm containing such characters (in
the field named "Nom").
With code like
{code}
PDDocument pdf = PDDocument.load("SampleForm.pdf");
PDAcroForm form = pdf.getDocumentCatalog().getAcroForm();
FDFDocument fdf = form.exportFDF();
List<FDFField> fields = fdf.getCatalog().getFDF().getFields();
StringWriter writer = new StringWriter();
fdf.saveXFDF(writer);
return writer.toString();
{code}
We get the following content
{code}
<?xml version="1.0" encoding="UTF-8"?>
<xfdf xmlns="http://ns.adobe.com/xfdf/"; xml:space="preserve">
<ids original="40DE256FBEC20B428C72BCF68015AB9E"
modified="3E3C2606FFB360C3FA74D3921A630318" />
<fields>
<field name="choix_1_J-64ncBSov7NcPeTY8oJ3A">
<value>Oui</value>
</field>
<field name="prenom_By11Gk3puTlnwwnv4WA0-g">
<value>special XML characters < > &</value>
</field>
<field name="nom_yQacEuz649N*BJguviO5Ow">
<value>special XML characters < > &</value>
</field>
</fields>
</xfdf>
{code}
which is not valid XML since '<', '>' and '&' should be escaped. The right
result would be :
{code}
<?xml version="1.0" encoding="UTF-8"?>
<xfdf xmlns="http://ns.adobe.com/xfdf/"; xml:space="preserve">
<ids original="40DE256FBEC20B428C72BCF68015AB9E"
modified="3E3C2606FFB360C3FA74D3921A630318" />
<fields>
<field name="choix_1_J-64ncBSov7NcPeTY8oJ3A">
<value>Oui</value>
</field>
<field name="prenom_By11Gk3puTlnwwnv4WA0-g">
<value>special XML characters &lt; &gt; &amp;</value>
</field>
<field name="nom_yQacEuz649N*BJguviO5Ow">
<value>special XML characters < > &</value>
</field>
</fields>
</xfdf>
{code}
Ideally, relying on JAXP (Java API for XML Processing) instead of manipulating
directly a String content would handle such things.
> XFDF export is not XML compliant
> --------------------------------
>
> Key: PDFBOX-2419
> URL: https://issues.apache.org/jira/browse/PDFBOX-2419
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm
> Affects Versions: 1.8.7
> Reporter: Laurent Richard
> Labels: FDF
> Fix For: 1.8.8
>
> Attachments: SampleForm.pdf
>
>
> The XFDF content is written as a simple string instead of XML nodes.
> As a result, field values containing special characters (&, <, >, ...) are
> not escaped and the resulting XML is invalid.
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