Java Tutorial/PDF/AcroFields

Fill AcroFields

import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import com.lowagie.text.Document;
import com.lowagie.text.PageSize;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.AcroFields;
import com.lowagie.text.pdf.BaseFont;
import com.lowagie.text.pdf.GrayColor;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfCopy;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfStamper;
import com.lowagie.text.pdf.PdfWriter;
import com.lowagie.text.pdf.RandomAccessFileOrArray;
import com.lowagie.text.pdf.TextField;
public class MainClass {
  public static void main(String[] args) throws Exception {
    createPdf("HelloLetter.pdf", "field", "value");
    RandomAccessFileOrArray letter = new RandomAccessFileOrArray("HelloLetter.pdf");
    PdfReader  reader = new PdfReader(letter, null);
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    PdfStamper stamper = new PdfStamper(reader, baos);
    AcroFields form = stamper.getAcroFields();
    form.setField("field", "World,");
    stamper.setFormFlattening(true);
    stamper.close();
    reader = new PdfReader(baos.toByteArray());
    Document document = new Document(reader.getPageSizeWithRotation(1));
    PdfCopy writer = new PdfCopy(document, new FileOutputStream("HelloWorldStampCopy.pdf"));
    document.open();
    writer.addPage(writer.getImportedPage(reader, 1));
    reader = new PdfReader(letter, null);
    baos = new ByteArrayOutputStream();
    stamper = new PdfStamper(reader, baos);
    form = stamper.getAcroFields();
    form.setField("field", "People,");
    stamper.setFormFlattening(true);
    stamper.close();
    reader = new PdfReader(baos.toByteArray());
    writer.addPage(writer.getImportedPage(reader, 1));
    document.close();
  }
  private static void createPdf(String filename, String field, String value) throws Exception {
    Document document = new Document(PageSize.A4);
    PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(filename));
    document.open();
    BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA, BaseFont.WINANSI, BaseFont.NOT_EMBEDDED);
    TextField tf = new TextField(writer, new Rectangle(64, 785, 340, 800), field);
    tf.setFontSize(12);
    tf.setFont(bf);
    tf.setText(value);
    tf.setTextColor(new GrayColor(0.5f));
    writer.addAnnotation(tf.getTextField());
    document.close();
  }
}

Rename AcroFields

import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import com.lowagie.text.Document;
import com.lowagie.text.PageSize;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.AcroFields;
import com.lowagie.text.pdf.BaseFont;
import com.lowagie.text.pdf.GrayColor;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfStamper;
import com.lowagie.text.pdf.PdfWriter;
import com.lowagie.text.pdf.RandomAccessFileOrArray;
import com.lowagie.text.pdf.TextField;
public class MainClass {
  public static void main(String[] args) throws Exception {
    createPdf("HelloLetter.pdf", "field", "value");
    RandomAccessFileOrArray letter = new RandomAccessFileOrArray("HelloLetter.pdf");
    PdfReader reader = new PdfReader(letter, null);
    ByteArrayOutputStream baos1 = new ByteArrayOutputStream();
    PdfStamper stamper = new PdfStamper(reader, baos1);
    AcroFields form = stamper.getAcroFields();
    form.renameField("field", "field1");
    stamper.close();
    reader = new PdfReader(letter, null);
    ByteArrayOutputStream baos2 = new ByteArrayOutputStream();
    stamper = new PdfStamper(reader, baos2);
    form = stamper.getAcroFields();
    form.renameField("field", "field2");
    stamper.close();
  }
  private static void createPdf(String filename, String field, String value) throws Exception {
    Document document = new Document(PageSize.A4);
    PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(filename));
    document.open();
    BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA, BaseFont.WINANSI, BaseFont.NOT_EMBEDDED);
    TextField tf = new TextField(writer, new Rectangle(64, 785, 340, 800), field);
    tf.setFontSize(12);
    tf.setFont(bf);
    tf.setText(value);
    tf.setTextColor(new GrayColor(0.5f));
    writer.addAnnotation(tf.getTextField());
    document.close();
  }
}