在 swing 中显示生成的文件列表中的文件图标

JFileChooser fileChooser = new JFileChooser();
fileChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
fileChooser.setCurrentDirectory(new File("路径"));
fileChooser.setFileFilter(new FileNameExtensionFilter("文本文件", "txt"));

class CustomFileView extends FileView {
    @Override
    public Icon getIcon(File file) {
        if (file.isDirectory()) {
            return UIManager.getIcon("FileView.directoryIcon");
        } else {
            String fileName = file.getName();
            String fileExtension = fileName.substring(fileName.lastIndexOf(".") + 1);
            // 根据文件扩展名返回对应的图标
            if (fileExtension.equalsIgnoreCase("txt")) {
                return new ImageIcon("txt图标路径");
            } else if (fileExtension.equalsIgnoreCase("doc")) {
                return new ImageIcon("doc图标路径");
            } else {
                return UIManager.getIcon("FileView.fileIcon");
            }
        }
    }
}

fileChooser.setFileView(new CustomFileView());

import javax.swing.*;
import javax.swing.filechooser.FileNameExtensionFilter;
import javax.swing.filechooser.FileView;
import java.io.File;

public class FileListWithIcon {
    public static void main(String[] args) {
        JFileChooser fileChooser = new JFileChooser();
        fileChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
        fileChooser.setCurrentDirectory(new File("路径"));
        fileChooser.setFileFilter(new FileNameExtensionFilter("文本文件", "txt"));
        fileChooser.setFileView(new CustomFileView());

        int result = fileChooser.showOpenDialog(null);
        if (result == JFileChooser.APPROVE_OPTION) {
            File selectedFile = fileChooser.getSelectedFile();
            System.out.println("Selected file: " + selectedFile.getAbsolutePath());
        }
    }

    static class CustomFileView extends FileView {
        @Override
        public Icon getIcon(File file) {
            if (file.isDirectory()) {
                return UIManager.getIcon("FileView.directoryIcon");
            } else {
                String fileName = file.getName();
                String fileExtension = fileName.substring(fileName.lastIndexOf(".") + 1);
                // 根据文件扩展名返回对应的图标
                if (fileExtension.equalsIgnoreCase("txt")) {
                    return new ImageIcon("txt图标路径");
                } else if (fileExtension.equalsIgnoreCase("doc")) {
                    return new ImageIcon("doc图标路径");
                } else {
                    return UIManager.getIcon("FileView.fileIcon");
                }
            }
        }
    }
}