如何从Java生成RTF？

import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFParagraph;
import org.apache.poi.xwpf.usermodel.XWPFRun;

import java.io.FileOutputStream;
import java.io.IOException;

public class ApachePOIExample {
    public static void main(String[] args) {
        try {
            XWPFDocument document = new XWPFDocument();
            XWPFParagraph paragraph = document.createParagraph();
            XWPFRun run = paragraph.createRun();
            run.setText("Hello, World!");
            run.setFontSize(20);
            run.setBold(true);
            run.setItalic(true);
            run.setUnderline(true);
            try (FileOutputStream out = new FileOutputStream("example.rtf")) {
                document.write(out);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import com.itextpdf.text.Document;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.pdf.PdfWriter;
import com.itextpdf.text.rtf.RtfWriter2;

import java.io.FileOutputStream;
import java.io.IOException;

public class iTextExample {
    public static void main(String[] args) {
        try {
            Document document = new Document();
            RtfWriter2.getInstance(document, new FileOutputStream("example.rtf"));
            document.open();
            document.add(new Paragraph("Hello, World!"));
            document.close();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (DocumentException e) {
            e.printStackTrace();
        }
    }
}

   <dependency>
       <groupId>org.apache.poi</groupId>
       <artifactId>poi-ooxml</artifactId>
       <version>5.2.1</version>
    </dependency>
   <dependency>
       <groupId>com.itextpdf</groupId>
       <artifactId>itextpdf</artifactId>
       <version>5.5.13.2</version>
    </dependency>
   <dependency>
       <groupId>com.itextpdf</groupId>
       <artifactId>itext-pdfa</artifactId>
       <version>5.5.13.2</version>
    </dependency>
</dependencies>