Вот полный код для анализа и записи RTF в виде простого текста
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.rtf.RTFEditorKit;
public class rtfToJson {
public static void main(String[] args)throws IOException, BadLocationException {
// TODO Auto-generated method stub
RTFEditorKit rtf = new RTFEditorKit();
Document doc = rtf.createDefaultDocument();
FileInputStream fis = new FileInputStream("C:\\SampleINCData.rtf");
InputStreamReader i =new InputStreamReader(fis,"UTF-8");
rtf.read(i,doc,0);
// System.out.println(doc.getText(0,doc.getLength()));
String doc1 = doc.getText(0,doc.getLength());
try{
FileWriter fw=new FileWriter("B:\\Sample INC Data.txt");
fw.write(doc1);
fw.close();
}catch(Exception e)
{
System.out.println(e);
}
System.out.println("Success...");
}
}