好的，这是您描述的示例。我不太确定拒绝添加文件的条件是什么。这是基于名称的，但我想知道您是否不是在寻找File.equals()using first getCanonicalFile()。我也在代码的注释中展示了这一点。
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.util.Vector;
import javax.swing.AbstractListModel;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
public class Test {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
initUI();
}
});
}
public static class MyListModel extends AbstractListModel {
private Vector<File> files = new Vector<File>();
public void addFilesToModel(File[] f) {
for (File file : f) {
addFileToModel(file);
}
}
public void addFileToModel(File file) throws IllegalArgumentException {
boolean found = false;
// file = file.getCanonicalFile();
for (File file2 : files) {
// file2.getCanonicalFile().equals(file) + throw IOException
if (file2.getName().equals(file.getName())) {
found = true;
break;
}
}
if (!found) {
files.add(file);
fireIntervalAdded(this, files.size() - 1, files.size() - 1);
} else {
// Abusive usage of an exception
throw new IllegalArgumentException("File " + file.getName() + " already added");
}
}
@Override
public int getSize() {
return files.size();
}
@Override
public Object getElementAt(int index) {
return files.get(index);
}
}
private static File lastFolder;
protected static void initUI() {
JFrame frame = new JFrame("test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
final MyListModel model = new MyListModel();
JList list = new JList(model);
final JButton button = new JButton("Add files...");
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JFileChooser chooser = new JFileChooser();
if (lastFolder != null) {
chooser.setCurrentDirectory(lastFolder);
}
chooser.setMultiSelectionEnabled(true);
chooser.showDialog(button, "Add files");
if (chooser.getSelectedFiles() != null) {
for (File file : chooser.getSelectedFiles()) {
try {
model.addFileToModel(file);
} catch (IllegalArgumentException e1) {
JOptionPane.showMessageDialog(button, e1.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
}
}
lastFolder = chooser.getCurrentDirectory();
}
}
});
panel.add(new JScrollPane(list));
panel.add(button);
frame.add(panel);
frame.pack();
frame.setVisible(true);
}
}
编辑
除了您的代码不完整这一事实之外，我还设法对其进行了安排并使其工作，但它确实远非完美。我也摆脱了 MigLayout，因为它需要一个额外的库。随意放回去。
import java.awt.Component;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.util.Vector;
import javax.swing.AbstractListModel;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
public class Test extends JFrame {
Vector<File> vector;
JPanel root;
private MyListModel model;
public class MyListModel extends AbstractListModel {
public void addFilesToModel(File[] f) {
for (File file : f) {
addFileToModel(file);
}
}
public void addFileToModel(File file) throws IllegalArgumentException {
boolean found = false;
// file = file.getCanonicalFile();
for (File file2 : vector) {
// file2.getCanonicalFile().equals(file) + throw IOException
if (file2.getName().equals(file.getName())) {
found = true;
break;
}
}
if (!found) {
vector.add(file);
fireIntervalAdded(this, vector.size() - 1, vector.size() - 1);
} else {
// Abusive usage of an exception
throw new IllegalArgumentException("File " + file.getName() + " already added");
}
}
public void removeFileFromModel(File file) throws IllegalArgumentException {
int index = vector.indexOf(file);
File removed = vector.remove(index);
if (removed != null) {
fireIntervalRemoved(this, index, index);
} else {
// Nothing was removed
}
}
public void removeFilesFromModel(File[] files) {
for (File f : files) {
removeFileFromModel(f);
}
}
@Override
public int getSize() {
return vector.size();
}
@Override
public Object getElementAt(int index) {
return vector.get(index);
}
}
public Test() {
super("EXAMPLE");
root = new JPanel(new GridBagLayout());
vector = new Vector<File>();
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridheight = 2;
getContentPane().add(root);
final JFileChooser fileChooser = new JFileChooser();
fileChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
fileChooser.setMultiSelectionEnabled(true);
root.add(fileChooser, gbc);
gbc.weightx = 1.0;
gbc.weighty = 1.0;
gbc.fill = GridBagConstraints.BOTH;
gbc.ipadx = 5;
gbc.ipady = 5;
gbc.gridheight = 1;
gbc.gridwidth = 3;
gbc.gridx = 1;
vector = new Vector<File>();
model = new MyListModel();
final JList list = new JList(model);
JScrollPane scrollPane = new JScrollPane(list);
root.add(scrollPane, gbc);
gbc.gridwidth = 1;
gbc.weightx = 0;
gbc.weighty = 0;
gbc.anchor = GridBagConstraints.CENTER;
final JButton btnNewButton = new JButton("Add");
btnNewButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
for (File file : fileChooser.getSelectedFiles()) {
try {
model.addFileToModel(file);
} catch (IllegalArgumentException e1) {
showError(btnNewButton, file);
}
}
}
});
gbc.gridy = 1;
root.add(btnNewButton, gbc);
JButton btnNewButton_1 = new JButton("Remove");
btnNewButton_1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (list.getSelectedIndices().length > 0) {
for (Object file : list.getSelectedValues()) {
model.removeFileFromModel((File) file);
}
}
}
});
gbc.gridx++;
root.add(btnNewButton_1, gbc);
final JButton btnNewButton_2 = new JButton("Check");
btnNewButton_2.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
File file = fileChooser.getSelectedFile();
boolean found = false;
for (File f : vector) {
if (file.getName().equals(f.getName())) {
found = true;
break;
}
}
if (found) {
showError(btnNewButton_2, file);
} else {
JOptionPane.showMessageDialog(btnNewButton_2, "File " + file.getAbsolutePath() + " is not in the list yet");
}
}
});
gbc.gridx++;
root.add(btnNewButton_2, gbc);
}
private void showError(Component parent, File file) {
JOptionPane.showMessageDialog(parent, "File " + file.getName() + " already added");
}
public static void main(String args[]) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
Test mainFrame = new Test();
mainFrame.pack();
mainFrame.setVisible(true);
}
});
}
}