how to change existing pdf font encoding (multi language) dynamically

[vamshiambati krishna]

Hi

i am using itext
i want to change existing pdf template with some dynamic strings of differen languages and create a pdf with that changes to existing pdf, but i am not able to change the encoding to that data , can any ony tell me how to change the encoding to existing pdf using itext

here i am adding the code

import java.awt.Color;
import java.io.*;
import java.net.MalformedURLException;
import java.text.SimpleDateFormat;
 
import com.lowagie.text.Chunk;
import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;
import com.lowagie.text.Font;
import com.lowagie.text.FontFactory;
import com.lowagie.text.HeaderFooter;
import com.lowagie.text.Image;
import com.lowagie.text.PageSize;
import com.lowagie.text.Paragraph;
import com.lowagie.text.Phrase;
import com.lowagie.text.pdf.BaseFont;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfImportedPage;
import com.lowagie.text.pdf.PdfLayer;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfStamper;
import com.lowagie.text.pdf.PdfString;
import com.lowagie.text.pdf.PdfWriter;
 
public class Sample12
{

//*private static Font stFont = FontFactory.getFont(FontFactory.HELVETICA, 10, Font.NORMAL, new Color(0, 0, 0));
private static Font grasFont = FontFactory.getFont(FontFactory.HELVETICA, 12, Font.BOLD, new Color(0, 0, 0));
/*private static Font fontTable = FontFactory.getFont(FontFactory.HELVETICA, 8, Font.NORMAL, new Color(0, 0, 0));
private static SimpleDateFormat dateFormat = new SimpleDateFormat("dd.MM.yyyy");*/
//private static 

public static void main(String[] k)
{
try {
 
//PdfReader reader = new PdfReader("E:\\iText\\bookmarks.pdf");

PdfReader reader = new PdfReader("E:\\iText\\HelloWorld44.pdf");
byte[] streamBytes = reader.getPageContent(1);
StringBuffer buf = new StringBuffer();
String cs =new String(streamBytes);
StringBuffer contentStream =new StringBuffer(cs);
int pos = contentStream.indexOf("Centre") ;
//int pos1 = contentStream.indexOf("TF");
                        //i tried this option but it is showing on console not in pdf
//String sw = new String("\u4f1a\u5f97\u5230\u98de\u901f\u7684\u54d1\u5c55".getBytes( "utf-8"));
  String sw = new String("\u4f1a\u5f97\u5230\u98de\u901f\u7684\u54d1\u5c55".getBytes());
  System.out.print(sw);
contentStream = contentStream.replace(pos,pos+7,sw);
System.out.print("position------>"+pos1);
buf.append(contentStream);
String hackedContentStream = buf.toString();
ByteArrayOutputStream baos = new ByteArrayOutputStream();           
PdfStamper stamper = new PdfStamper(reader, baos);           
reader.setPageContent(1,hackedContentStream.getBytes());
stamper.close();
PdfReader reader1 = new PdfReader(baos.toByteArray());
byte[] streamBytes1 = reader.getPageContent(1);
// we create a new PDF file that contains the hacked stream
Document document = new Document();//PageSize.A6);
PdfWriter writer = 
                                  PdfWriter.getInstance(document, 
                                                         new FileOutputStream("E:\\iText\\img\\mod\\drawsing365anithrrsaa.pdf"));
document.open();
BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
Font font = new Font(bfChinese, 18, Font.NORMAL);
PdfImportedPage paper = writer.getImportedPage(reader1,1);
String s1 =  "UniGB-UCS2-H";
PdfContentByte cb = writer.getDirectContent();
cb.setFontAndSize(bfChinese,18);
document.close();




System.out.println(" PDF Document Creation Done...");
}
catch (IOException e) {
e.printStackTrace();
} catch (DocumentException e) {
e.printStackTrace();
}
}}

[Nitesh: Added code tags. Please UseCodeTags while posting code.]
[ November 18, 2008: Message edited by: Nitesh Kant ]

[Ulf Dittmer]

Welcome to JavaRanch.

I can't quite tell from the code what you're trying to do, but there's not much that can be done to a PDF once it has been generated. In particular, you can't go back and change text or fonts in it. PDF is not meant to be editable in general, and iText makes no attempt to help with that.

[Megan James]

  public static void main(String[] args) throws IOException {
        String fileName="D:\\INS\\sample\\new_form_19.pdf";
        PdfReader reader = new PdfReader(fileName);
        byte[] streamBytes = reader.getPageContent(1);
//StringBuffer buf = new StringBuffer();
String cs =new String(streamBytes);
        System.out.println(cs);
    }

i try to get the pdf text to java string , but the above code doesnt help me .
could any one help me to proceed future.