Java给JFrame窗口设置热键的方法实现

使用了简单的JFrame窗口，在窗口中添加菜单，菜单选项，点击鼠标右键出现右键菜单，用io流将输入文本域的内容保存。并设置热键alt+x为退出的热键

public class MyNotepad extends JFrame{
//菜单栏
private JMenuBar jmb = new JMenuBar();
//菜单
private JMenu jmFile = new JMenu("文件(F)");
private JMenu jmEdit = new JMenu("编辑(E)");
private JMenu jmFormat = new JMenu("格式(O)");
private JMenu jmFind = new JMenu("查看(V)");
private JMenu jmHelp = new JMenu("帮助(H)");

//菜单项
private JMenuItem jmiNew = new JMenuItem("新建");
private JMenuItem jmiOpen = new JMenuItem("打开");
private JMenuItem jmiSave = new JMenuItem("保存");
private JMenuItem jmiOther = new JMenuItem("另存为");
private JMenuItem jmiExit = new JMenuItem("退出(X)");

private JCheckBoxMenuItem jmiAutoLine = new JCheckBoxMenuItem("自动换行");
private JMenuItem jmiFont = new JMenuItem("字体");

private JFileChooser jfc = new JFileChooser();

private JTextArea jta = new JTextArea();
private JScrollPane jsp = new JScrollPane(jta);

//上下文菜单
private JPopupMenu jpm = new JPopupMenu();
private JMenuItem jmiCopy = new JMenuItem("复制");
private JMenuItem jmiPaste = new JMenuItem("粘贴");

public MyNotepad() {
this.setTitle("记事本");
this.setSize(600,400);
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);

this.add(jmb,BorderLayout.NORTH);

jmb.add(jmFile);
jmb.add(jmEdit);
jmb.add(jmFormat);
jmb.add(jmFind);
jmb.add(jmHelp);

jmFile.add(jmiNew);
jmFile.add(jmiOpen);
jmFile.add(jmiSave);
jmFile.add(jmiOther);
jmFile.addSeparator();
jmFile.add(jmiExit);

jmFormat.add(jmiAutoLine);
jmFormat.add(jmiFont);

//上下文菜单
jpm.add(jmiCopy);
jpm.add(jmiPaste);
jpm.add(jmFile);
jta.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
 if(e.getButton() == 3){
 jpm.show(jta, e.getX(), e.getY());
 }
}
});

//文本域自动换行
this.add(jsp,BorderLayout.CENTER);

jmiAutoLine.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
 boolean selected = jmiAutoLine.isSelected();
 if(selected){
 jta.setLineWrap(true);
 }else{
 jta.setLineWrap(false);
 }
}
});

// 文件新建窗口
jmiNew.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 int choose = jfc.showOpenDialog(MyNotepad.this);
 switch (choose) {
 case JFileChooser.APPROVE_OPTION:
  System.out.println("点击了打开");
  break;
 case JFileChooser.CANCEL_OPTION:
  System.out.println("点击了取消");
  break;
 }
 }
});

//文件保存窗口，用随机数命名文件名随时保存进新的文件
   jmiSave.addActionListener(new ActionListener() {

@Override
 public void actionPerformed(ActionEvent arg0) {
 Random r = new Random();
 int a = r.nextInt(100);
 File file = new File("D:\\桌面\\b"+"r"+"a.txt");
 try {
  FileOutputStream fis = new FileOutputStream(file,true);
  BufferedOutputStream bis = new BufferedOutputStream(fis);
  byte [] b = jta.getText().getBytes();
  try {
  bis.write(b);
  bis.flush();
  bis.close();
  } catch (IOException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  }

} catch (FileNotFoundException e) {
  e.printStackTrace();
 }

}
});

jmiExit.registerKeyboardAction(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 System.exit(0);
 }
}, KeyStroke.getKeyStroke(KeyEvent.VK_X,KeyEvent.ALT_DOWN_MASK),
 JComponent.WHEN_IN_FOCUSED_WINDOW);//1.设置监听事件。2.设置热键alt+x关闭窗口3.设置触发当鼠标聚焦在窗口时

jmiExit.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 System.exit(0);
 }
});

this.setVisible(true);
}

public static void main(String[] args) {
new MyNotepad();
}
}

效果如下：

来源：https://blog.csdn.net/weixin_45444295/article/details/107409217