在itext7中保留表单字体的同时合并表单

PdfDocument pdfDoc = new PdfDocument(new PdfReader("input.pdf"), new PdfWriter("output.pdf"));

PdfAcroForm form = PdfAcroForm.getAcroForm(pdfDoc, true);
Map<String, PdfFormField> fields = form.getFormFields();
for (Map.Entry<String, PdfFormField> entry : fields.entrySet()) {
    PdfFormField field = entry.getValue();
    // 处理表单字段的字体
    // ...
}

PdfFont font = field.getFont();
field.setFont(font.makeSubset(field.getValue(), true));

form.flattenFields();

pdfDoc.close();