我必须使File Explorer带有复制，移动和删除选项以供研究。大多数工作已经完成，但是当我尝试使用此YouTube电影中的方式添加节点时：https://www.youtube.com/watch?v=rhRcxwreeVc
我遇到这种类型的错误：
java.io.File cannot be cast to javax.swing.tree.DefaultMutableTreeNode
有人知道将文件类型更改为DefaultMutableTreeNode类型的正确方法吗？
GUI类：
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import javax.swing.JScrollPane;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JTree;
import javax.swing.SwingConstants;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.JButton;
import java.nio.file.*;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.awt.event.ActionEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
public class GUI_2 {
private JFrame frame;
private JTextField leftPathTextField;
private JTextField rightPathTextField;
private Object selectedRightNode;
private Object selectedLeftNode;
private JTree rightTree;
private JTree leftTree;
/**
* Launch the application.
*/
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (InstantiationException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IllegalAccessException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (UnsupportedLookAndFeelException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
GUI_2 window = new GUI_2();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public GUI_2() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 837, 548);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel mainPanel = new JPanel();
frame.getContentPane().add(mainPanel, BorderLayout.CENTER);
mainPanel.setLayout(new GridLayout(1, 2, 0, 0));
JScrollPane leftScrollPanel = new JScrollPane();
mainPanel.add(leftScrollPanel);
JPanel leftPathPanel = new JPanel();
leftScrollPanel.setColumnHeaderView(leftPathPanel);
leftPathPanel.setLayout(new GridLayout(1, 2, 0, 0));
leftPathTextField = new JTextField();
leftPathTextField.setText("C:\\");
leftPathTextField.setColumns(10);
leftPathPanel.add(leftPathTextField);
leftTree = new JTree();
leftTree.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
if (leftTree.getSelectionPath().getLastPathComponent() != null)
selectedLeftNode = leftTree.getSelectionPath().getLastPathComponent();
}
});
leftTree.setModel(new FilesContentProvider(leftPathTextField.getText()));
leftScrollPanel.setViewportView(leftTree);
JButton leftFindButton = new JButton("Find");
leftFindButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
leftTree.setModel(new FilesContentProvider(leftPathTextField.getText()));
}
});
leftPathPanel.add(leftFindButton);
JScrollPane rightScrollPanel = new JScrollPane();
mainPanel.add(rightScrollPanel);
JPanel rightPathPanel = new JPanel();
rightScrollPanel.setColumnHeaderView(rightPathPanel);
rightPathPanel.setLayout(new GridLayout(1, 2, 0, 0));
rightPathTextField = new JTextField();
rightPathTextField.setText("C:\\");
rightPathTextField.setColumns(10);
rightPathPanel.add(rightPathTextField);
rightTree = new JTree();
rightTree.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
if (rightTree.getSelectionPath().getLastPathComponent() != null)
selectedRightNode = rightTree.getSelectionPath().getLastPathComponent();
}
});
rightTree.setModel(new FilesContentProvider(rightPathTextField.getText()));
rightScrollPanel.setViewportView(rightTree);
JButton rightFindButton = new JButton("Find");
rightFindButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
rightTree.setModel(new FilesContentProvider(rightPathTextField.getText()));
}
});
rightPathPanel.add(rightFindButton);
JLabel helloLablel = new JLabel("File Explorer");
helloLablel.setHorizontalAlignment(SwingConstants.CENTER);
frame.getContentPane().add(helloLablel, BorderLayout.NORTH);
JPanel panel = new JPanel();
frame.getContentPane().add(panel, BorderLayout.SOUTH);
panel.setLayout(new GridLayout(1, 3, 0, 0));
JButton copyButton = new JButton("Copy");
copyButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Path leftPathLocal = Paths.get(selectedLeftNode.toString());
Path rightPathLocal = Paths.get(selectedRightNode.toString() + "\\" + leftPathLocal.getFileName());
if (Files.isRegularFile(rightPathLocal))
try {
Files.copy(leftPathLocal, rightPathLocal, StandardCopyOption.REPLACE_EXISTING);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
else {
try {
Files.copy(leftPathLocal, rightPathLocal, StandardCopyOption.REPLACE_EXISTING);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
EngineDAOImpl engineDAOImpl = new EngineDAOImpl();
engineDAOImpl.copyFiles(leftPathLocal, rightPathLocal);
}
//selectedRightNode.add()
}
});
panel.add(copyButton);
JButton moveButton = new JButton("Move");
moveButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Path leftPathLocal = Paths.get(leftPathTextField.getText());
Path rightPathLocal = Paths.get(rightPathTextField.getText() + "\\" + leftPathLocal.getFileName());
if (!Files.isRegularFile(leftPathLocal)) {
try {
Files.move(leftPathLocal, rightPathLocal, StandardCopyOption.REPLACE_EXISTING);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
} else {
EngineDAOImpl engineDAOImpl = new EngineDAOImpl();
engineDAOImpl.moveFiles(leftPathLocal, rightPathLocal);
try {
Files.deleteIfExists(leftPathLocal);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}
});
panel.add(moveButton);
JButton deleteButton = new JButton("Delete");
deleteButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Path leftPathLocal = Paths.get(leftPathTextField.getText());
System.out.println(leftPathLocal);
if (Files.isRegularFile(leftPathLocal)) {
try {
Files.delete(leftPathLocal);
} catch (IOException e1) {
e1.printStackTrace();
}
} else {
EngineDAOImpl engineDAOImpl = new EngineDAOImpl();
engineDAOImpl.deleteFiles(leftPathLocal);
try {
Files.delete(leftPathLocal);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
DefaultTreeModel model = (DefaultTreeModel) leftTree.getModel();
model.removeNodeFromParent((DefaultMutableTreeNode) selectedLeftNode);
model.reload();
}
});
panel.add(deleteButton);
}
public void deleteNode(JTree tree) {
}
}
类创建节点：
import java.io.File;
import java.util.Arrays;
import java.util.List;
import javax.swing.event.TreeModelListener;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;
public class FilesContentProvider implements TreeModel {
private File node;
public FilesContentProvider(String path) {
node = new File(path);
}
public void addTreeModelListener(TreeModelListener l) {
}
public Object getChild(Object parent, int index) {
if (parent == null)
return null;
return ((File) parent).listFiles()[index];
}
public int getChildCount(Object parent) {
if (parent == null)
return 0;
return (((File) parent).listFiles() != null) ? ((File) parent).listFiles().length : 0;
}
public int getIndexOfChild(Object parent, Object child) {
List<File> list = Arrays.asList(((File) parent).listFiles());
return list.indexOf(child);
}
public Object getRoot() {
return node;
}
public boolean isLeaf(Object node) {
return ((File) node).isFile();
}
public void removeTreeModelListener(TreeModelListener l) {
}
public void valueForPathChanged(TreePath path, Object newValue) {
}
}
选项类别：
import java.io.File;
import java.io.IOException;
import java.nio.file.*;
import javax.swing.JTree;
public class EngineDAOImpl {
public void copyFiles(Path leftURL, Path rightURL) {
// TODO Auto-generated method stub
if (Files.isRegularFile(leftURL)) {
try {
Files.copy(leftURL, rightURL, StandardCopyOption.REPLACE_EXISTING);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
} else {
File[] listFiles = leftURL.toFile().listFiles();
for (File file : listFiles) {
String tmpRightPathString = rightURL.toString() + "\\" + file.getName();
System.out.println("Folder");
try {
Files.copy(file.toPath(), Paths.get(tmpRightPathString), StandardCopyOption.REPLACE_EXISTING);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
copyFiles(file.toPath(), Paths.get(tmpRightPathString));
}
}
}
public void moveFiles(Path leftURL, Path rightURL) {
// TODO Auto-generated method stub
if (Files.isRegularFile(leftURL)) {
try {
Files.move(leftURL, rightURL, StandardCopyOption.REPLACE_EXISTING);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
} else {
File[] listFiles = leftURL.toFile().listFiles();
for (File file : listFiles) {
String tmpRightPathString = rightURL.toString() + "\\" + file.getName();
try {
Files.copy(file.toPath(), Paths.get(tmpRightPathString), StandardCopyOption.REPLACE_EXISTING);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
copyFiles(file.toPath(), Paths.get(tmpRightPathString));
try {
Files.deleteIfExists(file.toPath());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
public void deleteFiles(Path URL) {
if (Files.isRegularFile(URL)) {
try {
Files.delete(URL);;
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
} else {
File[] listFiles = URL.toFile().listFiles();
for (File file : listFiles) {
String tmpRightPathString = URL.toString() + "\\" + file.getName();
deleteFiles(Paths.get(tmpRightPathString));
if (!Files.isRegularFile(Paths.get(tmpRightPathString))) {
try {
Files.delete(Paths.get(tmpRightPathString));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
}