How to adjust the content of a jtextarea?

As I can adjust the content of a jtextarea for example, I have this line inserted in the JTextArea:

jTextArea1.append("\n----------------------------------------------------------------------------------------------");

With this method I print the content of jtextarea but when it is printed, half of the line is printed and the other half is printed on another sheet.

public boolean imprimirTxtArea() {
            String fecha = catsFecha(new Date());
            String Cabeza = "Documento" + fecha;
            String Pie = "Numero de documento";

            try {

                MessageFormat header = new MessageFormat(Cabeza, Locale.US);
                MessageFormat footer = new MessageFormat(Pie, Locale.US);

                PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();
                aset.add(MediaSizeName.ISO_A4);
                aset.add(OrientationRequested.PORTRAIT);
                aset.add(Finishings.STAPLE);
                PrintService service = PrintServiceLookup.lookupDefaultPrintService();
                //Imprimir JTextArea
                //jTextArea1.get
                jTextArea1.print(header, footer, true, service, aset, true);
                String nombre = "DOCUMENTO" + catsFecha(new Date()) + this.getTitle();
                String path = nombre + ".txt";
                File f = new File(path);
                jTextArea1.write(new FileWriter(f));

            } catch (PrinterException ex) {
                Logger.getLogger(V3.class.getName()).log(Level.SEVERE, null, ex);
                return false;
            } catch (IOException ex) {
                Logger.getLogger(V3.class.getName()).log(Level.SEVERE, null, ex);
            }

            return true;
        }