Read PDF Acro Forms

PDFFormReader.java

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.encryption.InvalidPasswordException;
import org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm;
import org.apache.pdfbox.pdmodel.interactive.form.PDField;
import org.apache.pdfbox.pdmodel.interactive.form.PDNonTerminalField;

import java.io.IOException;
import java.util.List;

public class PDFFormReader {


    public static void main(String args[]) {
        PDFFormReader obj = new PDFFormReader();
        obj.process();
    }

    void process() {
        // Load the PDF document created by SimpleForm.java
        try {
            PDDocument document = PDDocument.load(this.getClass().getResourceAsStream("ACORD70_edited.pdf"));
            PDAcroForm acroForm = document.getDocumentCatalog().getAcroForm();

            //get all fields in form
            List<PDField> fields = acroForm.getFields();
            System.out.println(fields.size() + " top-level fields were found on the form");

            //inspect field values
            for (PDField field : fields) {
                processField(field, "|--", field.getPartialName());
            }
        } catch (InvalidPasswordException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    private void processField(PDField field, String sLevel, String sParent) throws IOException {
        String partialName = field.getPartialName();

        if (field instanceof PDNonTerminalField) {
            if (!sParent.equals(field.getPartialName())) {
                if (partialName != null) {
                    sParent = sParent + "." + partialName;
                }
            }
            System.out.println(sLevel + sParent);

            for (PDField child : ((PDNonTerminalField) field).getChildren()) {
                processField(child, "|  " + sLevel, sParent);
            }
        } else {
            //field has no child. output the value
            String fieldValue = field.getValueAsString();
            StringBuilder outputString = new StringBuilder(sLevel);
            outputString.append(sParent);
            if (partialName != null) {
                outputString.append(".").append(partialName);
            }
            outputString.append(" = ").append(fieldValue);
//            outputString.append(",  type=").append(field.getClass().getName());
            System.out.println(outputString);
        }
    }
}