如何删除JFileChooser中的文件？我知道自用本机编写以来，AWT可以选择使用简单的Delete按钮从中删除文件。
但如果我想删除JFileChooser中的文件怎么办？当我试图删除时，我得到一个例外，文件被另一个程序访问，因此无法删除。
我想在这种情况下提出的两个问题是..
问题
JFileChooser删除文件？FileDialog中删除时，为什么我没有收到其他程序正在访问文件。是因为它是用本机代码编写的吗？感谢任何帮助。提前谢谢。
答案 0 :(得分：2)
呀！我知道了！我甚至在删除文件后更新了JFileChooser。
已更新
添加了删除多个文件的功能，并修改了jf.getUI().rescanCurrentDirectory(jf)至jf.rescanCurrentDirectory()，并根据Rob Camick的建议删除了多余的PropertyChangeListener。
/*
* @see http://stackoverflow.com/a/17622050/2534090
* @author Gowtham Gutha
*/
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import java.io.*;
class DeleteThroughJFileChooser extends JFrame
{
JButton jb;
JFileChooser jf;
File[] selectedFiles;
public DeleteThroughJFileChooser()
{
// Create and show GUI
createAndShowGUI();
}
private void createAndShowGUI()
{
// Set frame properties
setTitle("Delete through JFileChooser");
setLayout(new FlowLayout());
setSize(400,400);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
// Create JFileChooser
jf=new JFileChooser();
// Allow multiple selection
jf.setMultiSelectionEnabled(true);
// Create JButton
jb=new JButton("Open JFileChooser");
// Add ActionListener to it
jb.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae)
{
// Show the file chooser
showFileChooser();
}
});
// Register the delete action
registerDelAction();
// Add JButton jb to JFrame
add(jb);
}
private void showFileChooser()
{
// Show the open dialog
int op=jf.showOpenDialog(this);
}
private void registerDelAction()
{
// Create AbstractAction
// It is an implementation of javax.swing.Action
AbstractAction a=new AbstractAction(){
// Write the handler
public void actionPerformed(ActionEvent ae)
{
JFileChooser jf=(JFileChooser)ae.getSource();
try
{
// Get the selected files
selectedFiles=jf.getSelectedFiles();
// If some file is selected
if(selectedFiles!=null)
{
// If user confirms to delete
if(askConfirm()==JOptionPane.YES_OPTION)
{
// Call Files.delete(), if any problem occurs
// the exception can be printed, it can be
// analysed
for(File f:selectedFiles)
java.nio.file.Files.delete(f.toPath());
// Rescan the directory after deletion
jf.rescanCurrentDirectory();
}
}
}catch(Exception e){
System.out.println(e);
}
}
};
// Get action map and map, "delAction" with a
jf.getActionMap().put("delAction",a);
// Get input map when jf is in focused window and put a keystroke DELETE
// associate the key stroke (DELETE) (here) with "delAction"
jf.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke("DELETE"),"delAction");
}
public int askConfirm()
{
// Ask the user whether he/she wants to confirm deleting
// Return the option chosen by the user either YES/NO
return JOptionPane.showConfirmDialog(this,"Are you sure want to delete this file?","Confirm",JOptionPane.YES_NO_OPTION);
}
public static void main(String args[])
{
SwingUtilities.invokeLater(new Runnable(){
public void run()
{
new DeleteThroughJFileChooser();
}
});
}
}
答案 1 :(得分：0)
为什么要从选择器中删除文件？
使用jfilechooser将文件名和位置存储作为变量。关闭文件jfilechooser。然后删除该文件。
import java.io.File;
public class DeleteFileExample
{
public static void main(String[] args)
{
try{
File file = new File("c:\\logfile20100131.log");
if(file.delete()){
System.out.println(file.getName() + " is deleted!");
}else{
System.out.println("Delete operation is failed.");
}
}catch(Exception e){
e.printStackTrace();
}
}
}
此外，如果您希望功能在jfilechooser本身中，我发现此代码可能会证明是有用的。来自Here。要运行此功能，您还需要This. Swing file
import darrylbu.util.SwingUtils;
import java.awt.Container;
import java.awt.Point;
import java.awt.event.*;
import javax.swing.*;
public class FileChooserDeleteMenu {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new FileChooserDeleteMenu().makeUI();
}
});
}
public void makeUI() {
final JFileChooser chooser = new JFileChooser();
final JList list = SwingUtils.getDescendantOfType(JList.class, chooser, "Enabled", true);
JPopupMenu popup = list.getComponentPopupMenu();
JMenuItem item = new JMenuItem("Delete");
item.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (chooser.getSelectedFile() != null) {
JOptionPane.showConfirmDialog(chooser,
"Delete " + chooser.getSelectedFile().getAbsolutePath() + "?",
"Confirm delete",
JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE);
}
}
});
popup.add(item);
final MouseListener listener = new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
Point p = e.getPoint();
if (e.getSource() == list) {
list.setSelectedIndex(list.locationToIndex(p));
} else {
JTable table = (JTable) e.getSource();
if (table.columnAtPoint(p) == 0) {
int row = table.rowAtPoint(p);
table.getSelectionModel().setSelectionInterval(row, row);
}
}
}
};
list.addMouseListener(listener);
final Container filePane = SwingUtilities.getAncestorOfClass(sun.swing.FilePane.class, list);
filePane.addContainerListener(new ContainerAdapter() {
@Override
public void componentAdded(ContainerEvent e) {
JTable table = SwingUtils.getDescendantOfType(JTable.class, chooser, "Enabled", true);
if (table != null) {
for (MouseListener l : table.getMouseListeners()) {
if (l == listener) {
return;
}
}
table.addMouseListener(listener);
}
}
});
chooser.showOpenDialog(null);
System.exit(0);
}
}
答案 2 :(得分：0)
这是向您的JFileChooser添加删除键侦听器的方法：
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.io.File;
import java.nio.file.Files;
public class JFileChooserUtilities
{
public static void registerDeleteAction(JFileChooser fileChooser)
{
AbstractAction abstractAction = new AbstractAction()
{
public void actionPerformed(ActionEvent actionEvent)
{
JFileChooser jFileChooser = (JFileChooser) actionEvent.getSource();
try
{
File selectedFile = jFileChooser.getSelectedFile();
if (selectedFile != null)
{
int selectedAnswer = JOptionPane.showConfirmDialog(null, "Are you sure want to permanently delete this file?", "Confirm", JOptionPane.YES_NO_OPTION);
if (selectedAnswer == JOptionPane.YES_OPTION)
{
Files.delete(selectedFile.toPath());
jFileChooser.rescanCurrentDirectory();
}
}
} catch (Exception exception)
{
exception.printStackTrace();
}
}
};
fileChooser.getActionMap().put("delAction", abstractAction);
fileChooser.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke("DELETE"), "delAction");
}
}
代码改编自JavaTechnical的答案。