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Stamping PDF file

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.PdfCopyFields; 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 {     createPdf("1.pdf", "field1", "value");     createPdf("2.pdf", "field2", "value");     ByteArrayOutputStream baos = new ByteArrayOutputStream();     PdfCopyFields copy = new PdfCopyFields(baos);     copy.addDocument(new PdfReader("1.pdf"));     copy.addDocument(new PdfReader("2.pdf"));     copy.close();     PdfReader reader = new PdfReader(baos.toByteArray());     PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(         "HelloWorldCopyStamp.pdf"));     AcroFields form = stamper.getAcroFields();     form.setField("field1", "World");     form.setField("field2", "People");     stamper.setFormFlattening(true);     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);     PdfContentByte cb = writer.getDirectContent();     cb.beginText();     cb.setFontAndSize(bf, 12);     cb.setLeading(16);     cb.moveText(36f, 788f);     cb.showText("Hi");     cb.newlineShowText("this is a atest");     cb.endText();     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();   } }