java 如何使“输入”键的行为类似于在 JFrame 上提交
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How to make "Enter" Key Behave like Submit on a JFrame
提问by Jalal Sordo
I'm Building a Client/Server application. and I want to to make it easy for the user at the Authentication Frame.
我正在构建一个客户端/服务器应用程序。我想让用户在身份验证框架中更容易。
I want to know how to make enter-key submits the login and password to the Database (Fires the Action) ?
我想知道如何让enter-key 将登录名和密码提交到数据库（触发操作）？
回答by trashgod
One convenient approach relies on setDefaultButton(), shown in this exampleand mentioned in How to Use Key Bindings.
一种方便的方法依赖于setDefaultButton()，在本示例中显示并在如何使用键绑定中提到。
JFrame f = new JFrame("Example");
Action accept = new AbstractAction("Accept") {
@Override
public void actionPerformed(ActionEvent e) {
// handle accept
}
};
private JButton b = new JButton(accept);
...
f.getRootPane().setDefaultButton(b);
回答by dacwe
Add an ActionListenerto the password field component:
ActionListener向密码字段组件添加一个：
The code below produces this screenshot:
下面的代码生成此屏幕截图：
public static void main(String[] args) throws Exception {
JFrame frame = new JFrame("Test");
frame.setLayout(new GridLayout(2, 2));
final JTextField user = new JTextField();
final JTextField pass = new JTextField();
user.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
pass.requestFocus();
}
});
pass.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String username = user.getText();
String password = pass.getText();
System.out.println("Do auth with " + username + " " + password);
}
});
frame.add(new JLabel("User:"));
frame.add(user);
frame.add(new JLabel("Password:"));
frame.add(pass);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
