java JFileChooser在JTextField中显示多个选定文件

Question

final JFileChooser fc = new JFileChooser();
   File[] files = fc.getSelectedFiles();

   private void showTxtFileFrame() {
       fc.setMultiSelectionEnabled(true);
       fc.setCurrentDirectory(new File(System.getProperty("user.home")));
       int result = fc.showOpenDialog(this);   
       if(result == JFileChooser.APPROVE_OPTION) {
            textfield1.setText(fc.getSelectedFile().getAbsolutePath());
    }

我想选择多个文件并将它们列在我的文本字段中。我可以选择多个文件，但它只显示单个文件的绝对路径

Answer 1

首先，我会在GUI组件中显示多个文件路径，这更适合显示多个对象，比如JList。另一方面，JFileChooser API将告诉您哪个方法只返回单个文件，哪个方法返回File[]:getSelectedFiles()的数组。注意结尾的s

当然，你不能把一个数组放到一个JTextField中，但我猜一旦你得到数据，你就知道该怎么处理它了

而且，这毫无意义：

final JFileChooser fc = new JFileChooser();
File[] files = fc.getSelectedFiles();

因为您实际上是在显示文件选择器对话框之前调用getSelectedFiles()。您要做的是在showTxtFileFrame()方法中调用该方法，就像您当前调用getSelectedFile()

---

例如：

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.io.File;
import javax.swing.*;

@SuppressWarnings("serial")
public class JFileChooserExample extends JPanel {
    // use a list model and JList that works *directly* with Files
    private DefaultListModel<File> fileListModel = new DefaultListModel<>();
    private JList<File> fileJList = new JList<>(fileListModel);

    public JFileChooserExample() {
        JPanel buttonPanel = new JPanel();
        buttonPanel.add(new JButton(new SelectFilesAction("Select Files", KeyEvent.VK_S)));

        // help set the width and height of the JList
        fileJList.setVisibleRowCount(10);
        fileJList.setPrototypeCellValue(new File("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"));
        JScrollPane scrollPane = new JScrollPane(fileJList);
        scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);

        setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));
        setLayout(new BorderLayout(3, 3));
        add(buttonPanel, BorderLayout.PAGE_START);
        add(scrollPane, BorderLayout.CENTER);
    }

    private class SelectFilesAction extends AbstractAction {
        public SelectFilesAction(String name, int mnemonic) {
            super(name);
            putValue(MNEMONIC_KEY, mnemonic);
        }

        @Override
        public void actionPerformed(ActionEvent e) {
            JFileChooser fc = new JFileChooser();
            fc.setMultiSelectionEnabled(true);
            fc.setCurrentDirectory(new File(System.getProperty("user.home")));
            int result = fc.showOpenDialog(JFileChooserExample.this);   
            if(result == JFileChooser.APPROVE_OPTION) {
                fileListModel.clear();  // clear the model of prior files
                 File[] files = fc.getSelectedFiles();
                 for (File file : files) {
                     // add all files to the model
                    fileListModel.addElement(file);
                }
            }
        }
    }

    private static void createAndShowGui() {
        JFileChooserExample mainPanel = new JFileChooserExample();

        JFrame frame = new JFrame("JFileChooser Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(mainPanel);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

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