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我有一个小小的Java程序完全可以工作。我想在输入PIN码时使“Enter”键工作。在我写这篇文章的时候，我只能点击按钮来使它工作，所以我想添加这个简单的功能而不用改变所有的代码。在我的Java程序中添加一个简单的Enter键功能
这是我发布的原因，因为我找到了它的几个链接，但没有一个对应我的情况，知道我已经有一个代码工作。我需要适应什么，我发现有：
Allowing the "Enter" key to press the submit button, as opposed to only using MouseClick http://tips4java.wordpress.com/2008/10/10/key-bindings/ http://docs.oracle.com/javase/tutorial/uiswing/misc/keybinding.html http://www.javaprogrammingforums.com/java-swing-tutorials/3171-jbutton-enter-key-keyboard-action.html http://www.rgagnon.com/javadetails/java-0253.html
，他们正在从nohting所有显示的解决方案并不能帮助我，因为我不能用他们做了什么事实在我自己的程序中。
正如你所看到的，这是“OK”按钮，我需要点击或按下“Enter”键
这里是我的代码，你有什么建议有回车键工作？
import java.io.*;
import java.util.*;
import java.util.concurrent.atomic.AtomicInteger;
import javax.swing.*;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DocumentFilter;
import javax.swing.text.PlainDocument;
import java.awt.*;
import java.awt.event.*;
public class Main extends JFrame {
private static final long serialVersionUID = 1L;
private JPanel container = new JPanel();
private JPasswordField p1 = new JPasswordField(4);
private JLabel label = new JLabel("Enter Pin: ");
private JButton b = new JButton("OK");
public Main() {
this.setTitle("NEEDS");
this.setSize(300, 500);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLocationRelativeTo(null);
container.setBackground(Color.white);
container.setLayout(new BorderLayout());
container.add(p1);
JPanel top = new JPanel();
PlainDocument document =(PlainDocument)p1.getDocument();
b.addActionListener(new BoutonListener());
top.add(label);
top.add(p1);
p1.setEchoChar('*');
top.add(b);
document.setDocumentFilter(new DocumentFilter(){
@Override
public void replace(DocumentFilter.FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException {
String string =fb.getDocument().getText(0, fb.getDocument().getLength())+text;
if(string.length() <= 4)
super.replace(fb, offset, length, text, attrs); //To change body of generated methods, choose Tools | Templates.
}
});
this.setContentPane(top);
this.setVisible(true);
}
class BoutonListener implements ActionListener {
private final AtomicInteger nbTry = new AtomicInteger(0);
ArrayList<Integer> pins = readPinsData(new File("bdd.txt"));
@SuppressWarnings("deprecation")
public void actionPerformed(ActionEvent e) {
if (nbTry.get() > 2) {
JOptionPane.showMessageDialog(null,
"Pin blocked due to 3 wrong tries");
return;
}
final String passEntered=p1.getText().replaceAll("\u00A0", "");
if (passEntered.length() != 4) {
JOptionPane.showMessageDialog(null, "Pin must be 4 digits");
return;
}
//JOptionPane.showMessageDialog(null, "Checking...");
//System.out.println("Checking...");
SwingWorker<Void, Void> worker = new SwingWorker<Void, Void>() {
@Override
protected Void doInBackground() throws Exception {
boolean authenticated = false;
ImageIcon imgAngry = new ImageIcon("angry.png");
ImageIcon imgHappy = new ImageIcon("happy.png");
if (pins.contains(Integer.parseInt(passEntered))) {
JOptionPane.showMessageDialog(null, "Pin correct", "Good Pin", JOptionPane.INFORMATION_MESSAGE, imgHappy);
authenticated = true;
}
if (!authenticated) {
JOptionPane.showMessageDialog(null, "Wrong Pin", "Wrong Pin", JOptionPane.INFORMATION_MESSAGE, imgAngry);
nbTry.incrementAndGet();
}
return null;
}
};
worker.execute();
}
}
// Reading bdd.txt file
static public ArrayList<Integer> readPinsData(File dataFile) {
final ArrayList<Integer> data=new ArrayList<Integer>();
try {
BufferedReader reader = new BufferedReader(new FileReader(dataFile));
String line;
try {
while ((line = reader.readLine()) != null) {
try {
data.add(Integer.parseInt(line));
} catch (NumberFormatException e) {
e.printStackTrace();
System.err.printf("error parsing line '%s'\n", line);
}
}
} finally {
reader.close();
}
} catch (Exception e) {
e.printStackTrace();
System.err.println("error:"+e.getMessage());
}
return data;
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new Main();
}
});
}
}
如果我理解正确的话，你想实现一个'KeyListener'，是这样吗？ –
其实这一切都很好。我只是想添加一个函数来使我的键盘上的“Enter”键在我的Button上工作。现在，这个按钮只能点击。 – hacks4life
我应该把这个放在哪里？这正是我的问题，我不知道如何调整我的代码，因为我没有添加从0开始的KeyListener。“ – hacks4life