如何自定义Swing的JFileChooser：背景色与路径文本框形状修改

我需要在Swing应用中插入JFileChooser对话框，希望自定义其外观以匹配其他窗口，但目前遇到以下问题：

• 修改JFileChooser的背景色
• 修改显示文件夹路径的JTextField的形状

以下是三个示例类，用于说明我遇到的问题：

自定义JDialog类 #

（将JFileChooser嵌入JDialog的思路来自Stack Overflow相关讨论）

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class FileChooserDialog extends JDialog {

    private ModifiedFileChooser modifiedFileChooser;

    public FileChooserDialog(ModifiedFileChooser modifiedFileChooser) {
        super();
        this.modifiedFileChooser = modifiedFileChooser;
        setUndecorated(true);
        setLayout(new BorderLayout());
        add(modifiedFileChooser, BorderLayout.CENTER);
        setBackground(new Color(180, 14, 14));

        pack();
        setVisible(true);
    }

    public static void main(String[] args) {

        JFrame frame = new JFrame();
        JButton openB = new JButton("Open");
        openB.setPreferredSize(new Dimension(50,20));
        frame.setLayout(new BorderLayout());
        frame.add(openB, BorderLayout.CENTER);

        openB.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                new FileChooserDialog(new ModifiedFileChooser());
            }
        });

        frame.setPreferredSize(new Dimension(300, 200));
        frame.setLocationRelativeTo(null);
        frame.pack();
        frame.setVisible(true);

    }
}

自定义JFileChooser类 #

（自定义JFileChooser的思路参考Stack Overflow相关讨论）

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

public class ModifiedFileChooser extends JFileChooser {

    public ModifiedFileChooser() {
        super();

        customizeFileChooser(this.getComponents());
        setBackground(new Color(180, 14, 14));
        repaint();
    }

    private void customizeFileChooser(Component[] comp) {

        for (int x = 0; x < comp.length; x++) {

            if (comp[x] instanceof JScrollPane) {
                ((JScrollPane) comp[x]).setBackground(new Color(180, 14, 14));
            }
            
            if (comp[x] instanceof JPanel) {

                ((JPanel) comp[x]).setBackground(new Color(180, 14, 14));

                customizeFileChooser(((JPanel) comp[x]).getComponents());

                Component[] c = ((JPanel) comp[x]).getComponents();

                for (int i = 0; i < c.length; i++) {

                    if (c[i] instanceof JTextField) {
                        int previousSize = ((JTextField) c[i]).getColumns();
                        c[i] = new RoundedTextField(previousSize);

                    }

                    if (c[i] instanceof JPanel) {
                        ((JPanel) c[i]).setBackground(new Color(180, 14, 14));
                    }

                    if (c[i] instanceof JScrollPane) {
                        ((JScrollPane) c[i]).setBackground(new Color(180, 14, 14));
                    }

                }
            }
        }
    }
}

自定义JTextField类 #

（圆角文本框的实现思路来自Stack Overflow相关讨论）

import javax.swing.*;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;

public class RoundedTextField extends JTextField {

    private Shape shape;
    public RoundedTextField(int size) {
        super(size);
        setOpaque(false);
    }
    protected void paintComponent(Graphics g) {
        g.setColor(getBackground());
        g.fillRoundRect(0, 0, getWidth()-1, getHeight()-1, 15, 15);
        super.paintComponent(g);
    }
    protected void paintBorder(Graphics g) {
        g.setColor(getForeground());
        g.drawRoundRect(0, 0, getWidth()-1, getHeight()-1, 15, 15);
    }
    public boolean contains(int x, int y) {
        if (shape == null || !shape.getBounds().equals(getBounds())) {
            shape = new RoundRectangle2D.Float(0, 0, getWidth()-1, getHeight()-1, 15, 15);
        }
        return shape.contains(x, y);
    }
}

点击框架中的按钮后显示的对话框如下：

理想状态下，我希望“文件名：”标签旁的文本框带有圆角，且JFileChooser的背景为红色而非灰色。

感谢您提供的任何帮助！

内容的提问来源于stack exchange，提问作者andy_07