如何锁定用户的键盘,以使用户无法在JTextField
输入任何数字值?
javax.swing.InputVerifier
works well for most simple tasks.
Here's one I knocked out the other day:
public class TexFieldValidator extends InputVerifier {
String regex;
String errorMsg;
JDialog popup;
public TexFieldValidator(String regex, String errorMsg) {
this.regex = regex;
this.errorMsg = errorMsg;
}
@Override
public boolean verify(JComponent input) {
boolean verified = false;
String text = ((JTextField) input).getText();
if (text.matches(regex)) {
input.setBackground(Color.WHITE);
if (popup != null) {
popup.dispose();
popup = null;
}
verified = true;
} else {
if (popup == null) {
popup = new JDialog((Window) input.getTopLevelAncestor());
input.setBackground(Color.PINK);
popup.setSize(0, 0);
popup.setLocationRelativeTo(input);
Point point = popup.getLocation();
Dimension dim = input.getSize();
popup.setLocation(point.x - (int) dim.getWidth() / 2, point.y + (int) dim.getHeight() / 2);
popup.getContentPane().add(new JLabel(errorMsg));
popup.setUndecorated(true);
popup.setFocusableWindowState(false);
popup.getContentPane().setBackground(Color.PINK);
popup.pack();
}
popup.setVisible(true);
}
return verified;
}
}
Stolen from here .
Example of use:
iDTextField.setInputVerifier(new TexFieldValidator("[a-zA-Z0-9]{3}", "ID must be 3 alphanumerics."));
您可以为此使用DocumentFilter ,也可以使用JFormattedTextField 。
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