我有一个带有loginbutton的简单jFrame，我试图通过按Enter键来激活我的ActionPerformed事件。我不想先按'tab'来聚焦按钮，但只要有人按下回车键，它就会触发。我在这里缺少什么？
编辑：如果更容易做到这一点，当焦点位于'PasswordField'时也可能触发事件，因为这是在按下登录按钮之前具有焦点的最后一个字段
根据要求。这是loginGUI的完整代码：
package unive.facturatie.boundary;
import java.awt.event.KeyEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JRootPane;
import javax.swing.KeyStroke;
import unive.facturatie.control.LoginManager;
/**
*
* @author Forza
*/
public class LoginGUI extends javax.swing.JFrame {
JFrame frame = new JFrame();
JRootPane rootPane = frame.getRootPane();
//JButton inloggenButton = new JButton("Login");
//frame.getRootPane().setDefaultButton(inloggenButton);
/**
* Creates new form LoginGUI
*/
public LoginGUI() {
frame.getRootPane().setDefaultButton(inloggenButton);
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(LoginGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(LoginGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(LoginGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(LoginGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
initComponents();
this.setLocation(320, 160);
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
inlogLabel = new javax.swing.JLabel();
gebruikersnaamLabel = new javax.swing.JLabel();
wachtwoordLabel = new javax.swing.JLabel();
gebruikersnaamTextField = new javax.swing.JTextField();
wachtwoordPasswordField = new javax.swing.JPasswordField();
inloggenButton = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("Facturatie inlogscherm");
inlogLabel.setFont(new java.awt.Font("Tahoma", 0, 36)); // NOI18N
inlogLabel.setText("Inloggen");
gebruikersnaamLabel.setText("Gebruikersnaam:");
wachtwoordLabel.setText("Wachtwoord:");
wachtwoordPasswordField.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
wachtwoordPasswordFieldActionPerformed(evt);
}
});
inloggenButton.setText("Inloggen");
inloggenButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
inloggenButtonActionPerformed(evt);
}
});
inloggenButton.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyPressed(java.awt.event.KeyEvent evt) {
inloggenButtonKeyPressed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(inlogLabel)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(inloggenButton)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(gebruikersnaamLabel)
.addComponent(wachtwoordLabel))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(gebruikersnaamTextField, javax.swing.GroupLayout.DEFAULT_SIZE, 171, Short.MAX_VALUE)
.addComponent(wachtwoordPasswordField)))))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(inlogLabel)
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(gebruikersnaamLabel)
.addComponent(gebruikersnaamTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(wachtwoordLabel)
.addComponent(wachtwoordPasswordField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(inloggenButton)
.addContainerGap(25, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void inloggenButtonActionPerformed(java.awt.event.ActionEvent evt) {
//frame.getRootPane().setDefaultButton(inloggenButton);
boolean isValid = false;
String username = gebruikersnaamTextField.getText();
String password = wachtwoordPasswordField.getText();
LoginManager loginManager = new LoginManager();
isValid = loginManager.Inloggen(username, password);
if (isValid == true)
{
new MainGUI().setVisible(true);
dispose();
}
else
{
JOptionPane.showMessageDialog(frame, "Gebruikersnaam en/of wachtwoord onjuist!", "Insane error", JOptionPane.ERROR_MESSAGE);
}
}
private void inloggenButtonKeyPressed(java.awt.event.KeyEvent evt) {
//frame.getRootPane().setDefaultButton(inloggenButton);
//inloggenButton.registerKeyboardAction(inloggenButton.getActionForKeyStroke(
//KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, 0, false)),
//KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, false),
//JButton.WHEN_IN_FOCUSED_WINDOW);
//inloggenButton.registerKeyboardAction(inloggenButton.getActionForKeyStroke(
//KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, 0, true)),
//KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, true),
//JButton.WHEN_IN_FOCUSED_WINDOW);
}
private void wachtwoordPasswordFieldActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
// Variables declaration - do not modify
private javax.swing.JLabel gebruikersnaamLabel;
private javax.swing.JTextField gebruikersnaamTextField;
private javax.swing.JLabel inlogLabel;
private javax.swing.JButton inloggenButton;
private javax.swing.JLabel wachtwoordLabel;
private javax.swing.JPasswordField wachtwoordPasswordField;
// End of variables declaration
}
答案 0 :(得分：4)
这很简单：
JFrame frame = new JFrame();
JButton btn = new JButton("Login");
frame.getRootPane().setDefaultButton(btn);
就是这样。您不需要KeyListener， registerKeyBoardAction 或 getKeyStroke ...只需为您的按钮设置ActionEvent并将该按钮设置为默认值。当窗口打开时按 Enter 将激活默认按钮。
答案 1 :(得分：2)
这是 A 问题......
您的课程从JFrame
public class LoginGUI extends javax.swing.JFrame {
但是你在其中创建另一个框架......
JFrame frame = new JFrame();
JRootPane rootPane = frame.getRootPane();
然后在constrcutor中，您针对“假”参考
注册您的按钮public LoginGUI() {
frame.getRootPane().setDefaultButton(inloggenButton);
<强>已更新
这很好用......
public class TestDefaultButton {
public static void main(String[] args) {
new TestDefaultButton();
}
public TestDefaultButton() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException ex) {
} catch (InstantiationException ex) {
} catch (IllegalAccessException ex) {
} catch (UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestForm());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
protected class TestForm extends JPanel {
private JButton myDefault;
private JTextField myText;
public TestForm() {
myDefault = new JButton("By Default");
myDefault.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(TestForm.this, "By default");
}
});
myText = new JTextField(12);
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.insets = new Insets(8, 8, 8, 8);
add(myText, gbc);
gbc.gridy++;
add(myDefault, gbc);
}
@Override
public void addNotify() {
super.addNotify();
SwingUtilities.getRootPane(this).setDefaultButton(myDefault);
}
}
}
答案 2 :(得分：0)
在我的项目中，我使用netbeans使用这个简单的代码：
private void txt_passwordKeyPressed(java.awt.event.KeyEvent evt)
{
if (evt.getKeyCode()==KeyEvent.VK_ENTER){
btn_login.doClick();
}
}