我有一个带有提交按钮和取消按钮的简单jFrame。目前，一切都很完美。用户在鼠标单击时执行操作。现在我想首先按下'tab'来聚焦按钮，然后每当有人按下回车键时它就会触发。它应该适用于两个键。我在这里错过了什么？我正在使用netbean IDE。下面是使用鼠标点击完美运行的代码示例。
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
String ws = null;
if(unitno.getText().length() == 14)
{
String substr=unitno.getText().substring(unitno.getText().length()-4);
if (substr.equals("0678"))
{
model.setSelectedItem("Tesla");
}
else if(substr.equals("0675"))
{
model.setSelectedItem("Weber Base");
}
else if(substr.equals("0676"))
{
model.setSelectedItem("Weber Mid");
}
else if(substr.equals("0677")|| substr.equals("067j")|| substr.equals("067J"))
{
model.setSelectedItem("Weber PDL");
}
}
try{
Double wd = Double.parseDouble(w.getText());
if(wd<251.43 || wd>253.03){
w.setForeground(Color.BLUE);
w.setBackground(Color.YELLOW);
wt.setForeground(Color.red);
}
else{
ws = w.getText();
w.setForeground(Color.BLACK);
w.setBackground(Color.WHITE);
}
if(ws ==null || unitno.getText().equals("")){
int dialogButton = JOptionPane.YES_NO_OPTION;
int dialogResult = JOptionPane.showConfirmDialog(this, "Empty field or out of spec is detected. Press YES to save and NO to edit.", "Error", dialogButton);
if(dialogResult ==0){
ws = w.getText();
w.setForeground(Color.BLACK);
w.setBackground(Color.WHITE);
BufferedWriter output = null;
FileInputStream fs = null;
FileWriter fout = null;
try {
// TODO add your handling code here:
File desktop = new File(System.getProperty("user.home"), "Desktop");
// Double total = Double.parseDouble(ba) + Double.parseDouble(fr) ;
File dir = new File (desktop + "/WattCPC");
if(!dir.exists()){
dir.mkdirs();
}
File myFile = new File(desktop + "/WattCPC/topextimechwidth.txt");
if(!myFile.exists()) {
myFile.createNewFile();
}
fs = new FileInputStream(desktop + "/WattCPC/topextimechwidth.txt");
BufferedReader br = new BufferedReader(new InputStreamReader(fs));
output = new BufferedWriter(new FileWriter(myFile,true));
PrintWriter fileout = new PrintWriter(output,true);
if (br.readLine() == null) {
fileout.println("Model" + "," + "Date" + "," + "Line" + "," + "Shift" + "," + "Unit Number" + "," + "Width");
}
DateFormat dateFormat = new SimpleDateFormat("MMM/dd/yyyy hh:mm");
Date date = new Date();
for(int i = 1; i<100; ++i){
String linez = br.readLine();
if(linez==null){
fileout.println(model.getSelectedItem() + "," + dateFormat.format(date) + "," + line.getSelectedItem() + "," + shift.getSelectedItem() + "," + unitno.getText() + "," + ws );
break;
}
}
} catch (IOException ex) {
Logger.getLogger(setup.class.getName()).log(Level.SEVERE, null, ex);
} finally {
try {
output.close();
} catch (IOException ex) {
Logger.getLogger(setup.class.getName()).log(Level.SEVERE, null, ex);
}
}
JOptionPane msg = new JOptionPane("Saved successfully", JOptionPane.INFORMATION_MESSAGE);
final JDialog dlg = msg.createDialog("Message");
dlg.setDefaultCloseOperation(JDialog.DO_NOTHING_ON_CLOSE);
new Thread(new Runnable() {
答案 0 :(得分：3)
一些外观（看着你的金属）使用 Space 键作为＆＃34;操作键＆＃34;。一个简单的解决方案是使用不同的外观，个人而言，我更喜欢系统的外观和感觉，因为它应该以用户用于当前系统的方式工作。
＆＃34;行动＆＃34; key将在触发时调用所有已注册的ActionListener
如果出于某种原因，您无法更改外观，则可以使用添加键绑定到JButton
JButton press = new JButton("Press me");
InputMap im = press.getInputMap(WHEN_FOCUSED);
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, false), "pressed");
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, true), "released");
JButton已经有一个名为pressed和released的注册密钥绑定，通常配置为默认＆＃34;操作＆＃34;关键，这样做只是重复使用，所以当你按下默认的＆＃34;动作＆＃34; key OR 输入键，他们会做同样的事情，你不需要做任何额外的编码。
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import javax.swing.InputMap;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new GridBagLayout());
JButton press = new JButton("Press me");
InputMap im = press.getInputMap(WHEN_FOCUSED);
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, false), "pressed");
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, true), "released");
press.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(TestPane.this, "You rang master?");
}
});
add(press);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
}
}
这很麻烦，因为您需要为每个JButton执行此操作，创建自定义JButton并使用它来代替或提供某种工厂方法来为您执行配置，这些都不是特别令人愉快的解决方案。
您拥有的另一个解决方案是创建自己的外观代理并替换默认委托。这不是很漂亮，并且有自己需要考虑的问题（比如你从哪个代表延伸，如果外观改变会发生什么？）
答案 1 :(得分：0)
使用键绑定将 Enter 键注册到JButton，如下所示：
KeyStroke enterKeyStroke = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER);
String action = "Enter"
Action enterAction = new AbstractAction(ActionEvent evt){
@Override
public void actionPerformed(ActionEvent e) {
jButton1ActionPerformed(evt);
}
};
jButton1.getInputMap(WHEN_FOCUSED).put(enterKeyStroke, action);
jButton1.getActionMap().put(action, enterAction);
我希望这能解决你的问题。
答案 2 :(得分：0)
见https://stackoverflow.com/a/16923982/1614775。 它建议
UIManager.put("Button.defaultButtonFollowsFocus", Boolean.TRUE);