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Java Swing - 如何格式JTextPane

jtextpane 【jtextpane】
我们想知道如何格式JTextPane。
代码展示 运行结果 
import java.awt.Color;
import java.util.Date;

import javax.swing.JFrame;
import javax.swing.JTextPane;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyledDocument;

public class Main {
  public static void main(String[] args) throws Exception{
    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    String s = new Date().toString();
    JTextPane jtp = new JTextPane();
    StyledDocument doc = (StyledDocument) jtp.getDocument();

    SimpleAttributeSet normal = new SimpleAttributeSet();
    StyleConstants.setFontFamily(normal, "SansSerif");
    StyleConstants.setFontSize(normal, 16);

    SimpleAttributeSet boldBlue = new SimpleAttributeSet(normal);
    StyleConstants.setBold(boldBlue, true);
    StyleConstants.setForeground(boldBlue, Color.blue);

    SimpleAttributeSet highAlert = new SimpleAttributeSet(boldBlue);
    StyleConstants.setFontSize(highAlert, 18);
    StyleConstants.setItalic(highAlert, true);
    StyleConstants.setForeground(highAlert, Color.red);

    doc.insertString(doc.getLength(), s + "\n", normal);
    doc.insertString(doc.getLength(), s + "\n", boldBlue);
    doc.insertString(doc.getLength(), s + "\n", highAlert);
    f.add(jtp);
    f.pack();
    f.setLocationRelativeTo(null);
    f.setVisible(true);
  }
}