我是Swing图书馆的新手。我正在尝试制作一个this picture之类的桌面应用程序。
此JFileChooser对象用于选择目标目录以在右侧窗格中显示树。
但是，当我选择目录时，右侧窗格中的树不会更改为查看新目的地方向的新树。
接下来我能做什么？谢谢你的帮助 这是我的代码：
public class DesktopUI {
private Path pathDirectChoose ;
private final File root = new File("/");
private File des;
public DesktopUI(){
initUI();
}
public void setPathDirectChoose(Path pathDirectChoose){
this.pathDirectChoose = pathDirectChoose;
}
public void setDes(String des){
this.des = new File(des);
}
private void initUI(){
JFrame frame = new JFrame("TestProject");
//make TopMenuBar
JMenuBar menuBar = new JMenuBar();
JMenu optionMenu = new JMenu("Option");
JMenuItem chooseSecretFolder = new JMenuItem("Choose Secret Folder");
JMenuItem exitItem = new JMenuItem("Exit");
JMenu helpMenu = new JMenu("Help");
JMenuItem helpItem = new JMenuItem("?Help");
JMenuItem aboutItem = new JMenuItem("About");
// config chooseSecretFolder
chooseSecretFolder.setToolTipText("Choose destinaion folder to encrypt");
chooseSecretFolder.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, InputEvent.CTRL_MASK));
exitItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_E,InputEvent.CTRL_MASK));
helpItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_H,InputEvent.CTRL_MASK));
chooseSecretFolder.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
File selectedDirect = null;
JFileChooser fileChooser = new JFileChooser();
fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
fileChooser.setCurrentDirectory(new File(System.getProperty("user.home")));
int result = fileChooser.showOpenDialog(fileChooser);
selectedDirect = fileChooser.getSelectedFile();
setPathDirectChoose(selectedDirect.toPath());
setDes(String.valueOf(pathDirectChoose));
System.out.println(String.valueOf(pathDirectChoose));
}
});
//add ActionListener for exit Item
exitItem.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
optionMenu.add(chooseSecretFolder);
optionMenu.add(exitItem);
helpMenu.add(helpItem);
helpMenu.add(aboutItem);
menuBar.add(optionMenu);
menuBar.add(helpMenu);
frame.setJMenuBar(menuBar);
//make JTextField to show PathFile choosed and view Tree
JTextField pathFileJText = new JTextField();
JTree leftTree = new JTree(new FileTreeModel(root));
JTree rightTree = new JTree(new FileTreeModel(des));
JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
JScrollPane leftPane = new JScrollPane(leftTree);
JScrollPane rightPane = new JScrollPane(rightTree);
//add TreeSelectionListener for tree system
leftTree.addTreeSelectionListener(new TreeSelectionListener() {
@Override
public void valueChanged(TreeSelectionEvent e) {
Object object = e.getPath().getLastPathComponent();
System.out.println(object);
pathFileJText.setText(object.toString());
// make a popupMenu when file be choosed
JPopupMenu popupMenu = new JPopupMenu();
JMenuItem encryptFile = new JMenuItem("Encrypt File");
JMenuItem decryptFile = new JMenuItem("Decrypt File");
popupMenu.add(encryptFile);
popupMenu.add(decryptFile);
leftTree.addMouseListener(new MouseAdapter() {
@Override
public void mouseReleased(MouseEvent e) {
super.mouseReleased(e);
if (e.getButton() == MouseEvent.BUTTON3){
popupMenu.show(e.getComponent(),e.getX(),e.getY());
}
}
});
}
});
//show all componets
splitPane.setLeftComponent(leftPane);
splitPane.setRightComponent(rightPane);
frame.add(pathFileJText,BorderLayout.NORTH);
frame.add(splitPane,BorderLayout.CENTER);
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.setSize(500,500);
frame.setVisible(true);
}
public static void main(String[] args){
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
DesktopUI desktopUI = new DesktopUI();
}
});
}
}
答案 0 :(得分：0)
我已经纠正了您的示例，但是由于您尚未提供SSCCE
，因此我不确定该示例是否有效public class DesktopUI {
private Path pathDirectChoose ;
private final File root = new File("/");
private File des;
private JTree rightTree; // declare as object property
public DesktopUI(){
initUI();
}
public void setPathDirectChoose(Path pathDirectChoose){
this.pathDirectChoose = pathDirectChoose;
}
public void setDes(String des){
this.des = new File(des);
rightTree.setModel(new FileTreeModel(des));
}
private void initUI(){
JFrame frame = new JFrame("TestProject");
//make TopMenuBar
JMenuBar menuBar = new JMenuBar();
JMenu optionMenu = new JMenu("Option");
JMenuItem chooseSecretFolder = new JMenuItem("Choose Secret Folder");
JMenuItem exitItem = new JMenuItem("Exit");
JMenu helpMenu = new JMenu("Help");
JMenuItem helpItem = new JMenuItem("?Help");
JMenuItem aboutItem = new JMenuItem("About");
// config chooseSecretFolder
chooseSecretFolder.setToolTipText("Choose destinaion folder to encrypt");
chooseSecretFolder.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, InputEvent.CTRL_MASK));
exitItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_E,InputEvent.CTRL_MASK));
helpItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_H,InputEvent.CTRL_MASK));
chooseSecretFolder.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
File selectedDirect = null;
JFileChooser fileChooser = new JFileChooser();
fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
fileChooser.setCurrentDirectory(new File(System.getProperty("user.home")));
int result = fileChooser.showOpenDialog(fileChooser);
selectedDirect = fileChooser.getSelectedFile();
setPathDirectChoose(selectedDirect.toPath());
setDes(String.valueOf(pathDirectChoose));
System.out.println(String.valueOf(pathDirectChoose));
}
});
//add ActionListener for exit Item
exitItem.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
optionMenu.add(chooseSecretFolder);
optionMenu.add(exitItem);
helpMenu.add(helpItem);
helpMenu.add(aboutItem);
menuBar.add(optionMenu);
menuBar.add(helpMenu);
frame.setJMenuBar(menuBar);
//make JTextField to show PathFile choosed and view Tree
JTextField pathFileJText = new JTextField();
JTree leftTree = new JTree(new FileTreeModel(root));
rightTree = new JTree(new FileTreeModel(des)); // no type declaration here
JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
JScrollPane leftPane = new JScrollPane(leftTree);
JScrollPane rightPane = new JScrollPane(rightTree);
//add TreeSelectionListener for tree system
leftTree.addTreeSelectionListener(new TreeSelectionListener() {
@Override
public void valueChanged(TreeSelectionEvent e) {
Object object = e.getPath().getLastPathComponent();
System.out.println(object);
pathFileJText.setText(object.toString());
// make a popupMenu when file be choosed
JPopupMenu popupMenu = new JPopupMenu();
JMenuItem encryptFile = new JMenuItem("Encrypt File");
JMenuItem decryptFile = new JMenuItem("Decrypt File");
popupMenu.add(encryptFile);
popupMenu.add(decryptFile);
leftTree.addMouseListener(new MouseAdapter() {
@Override
public void mouseReleased(MouseEvent e) {
super.mouseReleased(e);
if (e.getButton() == MouseEvent.BUTTON3){
popupMenu.show(e.getComponent(),e.getX(),e.getY());
}
}
});
}
});
//show all componets
splitPane.setLeftComponent(leftPane);
splitPane.setRightComponent(rightPane);
frame.add(pathFileJText,BorderLayout.NORTH);
frame.add(splitPane,BorderLayout.CENTER);
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.setSize(500,500);
frame.setVisible(true);
}
public static void main(String[] args){
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
DesktopUI desktopUI = new DesktopUI();
}
});
}
}