java - 如何在 JFileChooser 窗口中选择多个文件

Question

我不知道如何在 JFileChooser 窗口中一次选择多个文件。我认为它已经启用，因为我在 JFileChooser 对象上使用了 setMultiSelectionEnabled(true) 方法，但是当我尝试实际选择多个时，我无法做到这一点。我尝试了单击并拖动、CTRL 和箭头键/单击、Alt 和箭头键/单击、Shift 和箭头键/单击，但仍然没有成功。我怎样才能做到这一点？

我创建 JFileChooser 的代码:仅使用一个文件时，解析方法工作正常。当按下 JFrame 中的按钮时调用该类。

public class FileChooser implements ActionListener, Runnable
{
    private Parser parser = new Parser();
    private static File[] selectedFiles;
    private static File currentSelected;
    private JFileChooser jfc;

    public static File getSelectedFile()
    {
    return currentSelected;
}

public void actionPerformed(ActionEvent actionEvent)
{
        new Thread(this).start();
}

public void run()
{
    if ( Window.bFG5IsPressed() && Window.bFGAIsPressed() )
    {
        jfc  = new JFileChooser(FileSystemView.getFileSystemView().getHomeDirectory());
        jfc.setMultiSelectionEnabled(true);
        int returnValue = jfc.showOpenDialog(null);

        if (returnValue == JFileChooser.APPROVE_OPTION)
        {
            selectedFiles = jfc.getSelectedFiles();
            for (File e : selectedFiles) {
                currentSelected = e;
                parser.parseAll(e.getAbsolutePath());
            }
        }
    }
    else if ( Window.bFG5IsPressed() )
    {
        jfc  = new JFileChooser(FileSystemView.getFileSystemView().getHomeDirectory());
        int returnValue = jfc.showOpenDialog(null);

        if (returnValue == JFileChooser.APPROVE_OPTION)
        {
            selectedFiles = jfc.getSelectedFiles();
            for (File e : selectedFiles) {
                currentSelected = e;
                parser.parseFG5(e.getAbsolutePath());
            }
        }

    }
    else if ( Window.bFGAIsPressed() )
    {
        jfc  = new JFileChooser(FileSystemView.getFileSystemView().getHomeDirectory());
        int returnValue = jfc.showOpenDialog(null);

        if (returnValue == JFileChooser.APPROVE_OPTION)
        {
            selectedFiles = jfc.getSelectedFiles();
            for (File e : selectedFiles) {
                currentSelected = e;
                parser.parseFGA(e.getAbsolutePath());
            }
        }

    }
    else
    {
        JOptionPane x = new JOptionPane();
        x.showMessageDialog(x, "Escolher tipo de arquivo");
        x.setLocation(300,300);
        x.setVisible(true);
    }
}

}

Answer 1

调用setMultiSelectionEnabled(true)。这是一个运行示例:

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.util.Arrays;

public class MultipleFileChooser extends JFrame {
    public static void main(String[] args) {
        MultipleFileChooser multipleFileChooser = new MultipleFileChooser();
        JFileChooser fileChooser = new JFileChooser();
        fileChooser.setMultiSelectionEnabled(true);
        JButton button = new JButton("Open Files");
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                int choice = fileChooser.showOpenDialog(multipleFileChooser);
                if (choice == JFileChooser.APPROVE_OPTION) {
                    File[] openFiles = fileChooser.getSelectedFiles();
                    System.out.println("Files: " + Arrays.toString(openFiles));
                }
            }
        });
        JPanel panel = new JPanel();
        panel.add(button);
        multipleFileChooser.add(panel);
        multipleFileChooser.setSize(new Dimension(400, 400));
        multipleFileChooser.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        multipleFileChooser.setVisible(true);
    }
}

附上截图供OP引用: