如何使用java中的routerLayout在其他视图中添加页脚和页眉

import javax.swing.*;
import java.awt.*;

public class RouterLayout extends JFrame {
    private JPanel headerPanel;
    private JPanel footerPanel;

    public RouterLayout() {
        setTitle("Router Layout Example");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(400, 300);

        // 创建页眉面板
        headerPanel = new JPanel();
        headerPanel.setBackground(Color.GRAY);
        headerPanel.setPreferredSize(new Dimension(getWidth(), 50));
        JLabel headerLabel = new JLabel("页眉");
        headerLabel.setForeground(Color.WHITE);
        headerPanel.add(headerLabel);

        // 创建页脚面板
        footerPanel = new JPanel();
        footerPanel.setBackground(Color.GRAY);
        footerPanel.setPreferredSize(new Dimension(getWidth(), 50));
        JLabel footerLabel = new JLabel("页脚");
        footerLabel.setForeground(Color.WHITE);
        footerPanel.add(footerLabel);

        // 设置布局管理器
        setLayout(new BorderLayout());
        add(headerPanel, BorderLayout.NORTH);
        add(footerPanel, BorderLayout.SOUTH);

        setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> new RouterLayout());
    }
}