JOptionPane pour obtenir le mot de passe

Oui, il est possible d'utiliser JOptionPane.showOptionDialog(). Quelque chose comme ceci:

JPanel panel = new JPanel();
JLabel label = new JLabel("Enter a password:");
JPasswordField pass = new JPasswordField(10);
panel.add(label);
panel.add(pass);
String[] options = new String[]{"OK", "Cancel"};
int option = JOptionPane.showOptionDialog(null, panel, "The title",
                         JOptionPane.NO_OPTION, JOptionPane.PLAIN_MESSAGE,
                         null, options, options[1]);
if(option == 0) //pressing OK button
{
    char[] password = pass.getPassword();
    System.out.println("Your password is: " + new String(password));
}

Vous pouvez créer vous êtes propre boîte de dialogue qui s'étend JDialog et puis vous pouvez mettre ce que vous voulez dedans.

La classe suivante est une extension de Adamski la grande réponse:

package com.stackoverflow.swing;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
/**
* Class that creates a panel with a password field. Extension of Adamski's class
*
* @author adamski https://stackoverflow.com/users/127479/adamski
* @author agi-hammerthief https://stackoverflow.com/users/2225787/agi-hammerthief
* @see https://stackoverflow.com/a/8881370/2225787
*/
public class PasswordPanel extends JPanel {
private final JPasswordField JFieldPass;
private JLabel JLblPass;
private boolean gainedFocusBefore;
/**
* "Hook" method that causes the JPasswordField to request focus when method is
* first  called.
*/
public void gainedFocus () {
if (!gainedFocusBefore) {
gainedFocusBefore = true;
JFieldPass.requestFocusInWindow();
}
}
public PasswordPanel (int length) {
super(new FlowLayout());
gainedFocusBefore = false;
JFieldPass = new JPasswordField(length);
Dimension d = new Dimension();
d.setSize(30, 22);
JFieldPass.setMinimumSize(d);
JFieldPass.setColumns(10);
JLblPass = new JLabel("Password: ");
add(JLblPass);
add(JFieldPass);
}
public PasswordPanel() {
super(new FlowLayout());
gainedFocusBefore = false;
JFieldPass = new JPasswordField();
Dimension d = new Dimension();
d.setSize(30, 22);
JFieldPass.setMinimumSize(d);
JFieldPass.setColumns(10);
JLblPass = new JLabel("Password: ");
add(JLblPass);
add(JFieldPass);
}
public char[] getPassword() {
return JFieldPass.getPassword();
}
public String getPasswordString() {
StringBuilder passBuilder = new StringBuilder();
char[] pwd = this.getPassword();
if (pwd.length > 0) {
for (char c : pwd) {
passBuilder.append(c);
}
}
return passBuilder.toString();
}
private static String displayDialog (
Component parent, final PasswordPanel panel, String title
) {
String password = null;
/* For some reason, using `JOptionPane(panel, JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE)`
does not give the same results as setting values after creation, which is weird */
JOptionPane op = new JOptionPane(panel);
op.setMessageType(JOptionPane.QUESTION_MESSAGE);
op.setOptionType(JOptionPane.OK_CANCEL_OPTION);
JDialog dlg = op.createDialog(parent, title);
//Ensure the JPasswordField is able to request focus when the dialog is first shown.
dlg.addWindowFocusListener (new WindowAdapter () {
@Override
public void windowGainedFocus (WindowEvent e) {
panel.gainedFocus ();
}
});
dlg.setDefaultCloseOperation (JOptionPane.OK_OPTION); //necessary?
dlg.setVisible (true);
Object val = op.getValue ();
if (null != val && val.equals (JOptionPane.OK_OPTION)) {
password = panel.getPasswordString();
}
return password;
}
public static String showDialog (Component parent, String title) {
final PasswordPanel pPnl = new PasswordPanel();
return displayDialog(parent, pPnl, title);
}
public static String showDialog (
Component parent, String title, int passwordLength
) {
final PasswordPanel pPnl = new PasswordPanel(passwordLength);
return displayDialog (parent, pPnl, title);
}
public static String showDialog (String title) {
return showDialog(null, title);
}
public static String showDialog (String title, int passwordLength) {
return showDialog(null, title, passwordLength);
}
/**
* Show a test dialog
*/
public static void main(String[] args) {
String test = PasswordPanel.showDialog ("Enter Your Password");
System.out.println ("Entered Password: " + test);
System.exit(0);
}
}