iText 5.0.0 released on December 7, 2009, and I noticed it has some big changes need you to pay attention to,
Version 2.1 of iText has partial support for reading an RTF file and converting it to a PDF. This feature is still under development.
and here is the example on how to parser and convert RTF to PDF(from http://cfsearching.blogspot.com/2009/04/itext-preview-of-things-to-come-someday.html)
import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;
import com.lowagie.text.pdf.PdfWriter;
import com.lowagie.text.rtf.parser.RtfParser;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
public class ConvertRTFToPDF {
public static void main(String[] args) {
String inputFile = "sample.rtf";
String outputFile = "sample_converted.pdf";
// create a new document
Document document = new Document();
try {
// create a PDF writer to save the new document to disk
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(outputFile));
// open the document for modifications
document.open();
// create a new parser to load the RTF file
RtfParser parser = new RtfParser(null);
// read the rtf file into a compatible document
parser.convertRtfDocument(new FileInputStream(inputFile), document);
// save the pdf to disk
document.close();
System.out.println("Finished");
} catch (DocumentException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
A digital signature is like a paper-based signature – each giving you a method for adding a unique identifier to a document. Both provide you with an easy way to show a person signed a particular document at a particular time, but a digital signature goes further as it can ensure that the document content has not been tampered with after it was signed. In addition, the document version history can let recipients see when a document was signed and see when any changes were made to it. This revision history is encrypted and stored inside the PDF and can be viewed at anytime via the Signatures pane.
To digitally sign a PDF document, you must have a digital ID, and to verify other people’s signatures, you must first share your digital IDs and add each other to your Trusted Contacts list.
Most Digital Signature software are not free, but I will introduce you some free software developed in JAVA and DOTNET with the power of iText and iTextSharp.
Want to develop your own? please visit How to sign a PDF using iText and iTextSharp.