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Java Swing - 如何在JTextpane的所有4面上添加相等大小的边框

jtextpane 【jtextpane】
我们想知道如何在JTextpane的所有4面上添加相等大小的边框。
代码展示 运行结果 
import java.awt.BorderLayout;
import java.awt.Color;

import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextPane;
import javax.swing.border.EmptyBorder;

public class Main {
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.add(new TestPane());
    frame.pack();
    frame.setVisible(true);
  }
}

class TestPane extends JPanel {

  public TestPane() {
    setLayout(new BorderLayout());
    setBorder(new EmptyBorder(10, 10, 10, 10));
    JTextPane pane = new JTextPane();
    JPanel panel = new JPanel(new BorderLayout());
    JPanel innerPanel = new JPanel(new BorderLayout());

    pane.setBorder(BorderFactory.createLineBorder(Color.BLACK));
    innerPanel.add(pane);
    panel.add(innerPanel);
    add(panel);
  }
}