Here is the way how to covert your Text file to PDF File,

public class TextFileToPDF { private static void doReadWriteTextFile() {

    try {

        BufferedReader inputStream = new BufferedReader(new FileReader(
                "**INPUT FILE**"));

        String inLine = null;
        StringBuffer sb = new StringBuffer("");

        while ((inLine = inputStream.readLine()) != null) {

            sb.append(inLine);
        }

        Document document = new Document();
        PdfWriter.getInstance(document, new FileOutputStream(
                "**OUTPUT FILE**"));
        document.open();
        document.add(new Paragraph(sb.toString()));
        sb.append(inLine);
        System.out.println("Text is inserted into pdf file");
        document.close();

        inputStream.close();

    } catch (Exception e) {

        System.out.println("IOException:");
        e.printStackTrace();

    }

}

public static void main(String[] args) {
    doReadWriteTextFile();
}

}