Java Tutorial/PDF/AcroForm

Changes the URL of an AcroForm

import java.io.FileOutputStream;
import java.util.HashMap;
import com.lowagie.text.pdf.AcroFields;
import com.lowagie.text.pdf.PRIndirectReference;
import com.lowagie.text.pdf.PdfDictionary;
import com.lowagie.text.pdf.PdfName;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfStamper;
import com.lowagie.text.pdf.PdfString;
public class MainClass {
  public static void main(String[] args) throws Exception {
    PdfReader reader = new PdfReader("2.pdf");
    PdfStamper stamper = new PdfStamper(reader, new FileOutputStream("3.pdf"));
    AcroFields form = stamper.getAcroFields();
    HashMap fields = form.getFields();
    AcroFields.Item field = (AcroFields.Item) fields.get("PushMe");
    PRIndirectReference ref = (PRIndirectReference) field.widget_refs.iterator().next();
    PdfDictionary object = (PdfDictionary) reader.getPdfObject(ref.getNumber());
    PdfDictionary action = (PdfDictionary) object.get(PdfName.A);
    PdfDictionary file = (PdfDictionary) action.get(PdfName.F);
    file.put(PdfName.F, new PdfString("http://yourserver/form.jsp"));
    stamper.close();
  }
}

Fill AcroForm

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.PdfReader;
import com.lowagie.text.pdf.PdfStamper;
import com.lowagie.text.pdf.PdfWriter;
import com.lowagie.text.pdf.TextField;
public class MainClass {
  public static void main(String[] args) throws Exception {
    Document document = new Document(PageSize.A4);
    PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(
        "HelloWorldForm.pdf"));
    document.open();
    BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA, BaseFont.WINANSI,
        BaseFont.NOT_EMBEDDED);
    PdfContentByte cb = writer.getDirectContent();
    cb.beginText();
    cb.setFontAndSize(bf, 12);
    cb.moveText(36f, 788);
    cb.showText("Hello");
    cb.endText();
    TextField tf = new TextField(writer, new Rectangle(67, 785, 340, 800),
        "Who");
    tf.setFontSize(12);
    tf.setFont(bf);
    tf.setText("Who?");
    tf.setTextColor(new GrayColor(0.5f));
    writer.addAnnotation(tf.getTextField());
    document.close();
    PdfReader reader;
    PdfStamper stamper;
    AcroFields form;
    reader = new PdfReader("HelloWorldForm.pdf");
    stamper = new PdfStamper(reader, new FileOutputStream(
        "HelloWorldFilledInForm.pdf"));
    form = stamper.getAcroFields();
    form.setField("Who", "World");
    stamper.close();
    reader = new PdfReader("HelloWorldForm.pdf");
    stamper = new PdfStamper(reader, new FileOutputStream(
        "HelloWorldFilledInFlattened.pdf"));
    form = stamper.getAcroFields();
    form.setField("Who", "People");
    stamper.setFormFlattening(true);
    stamper.close();
  }
}