好的，我可能遗漏了一些东西，但我很快就将它破解了，没有任何问题
public class PopupFrame extends javax.swing.JFrame {
/**
* Creates new form PopupFrame
*/
public PopupFrame() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jMenuBar1 = new javax.swing.JMenuBar();
mnuFile = new javax.swing.JMenu();
jMenuItem1 = new javax.swing.JMenuItem();
jMenuItem2 = new javax.swing.JMenuItem();
jMenuItem3 = new javax.swing.JMenuItem();
jMenuItem4 = new javax.swing.JMenuItem();
jMenuItem5 = new javax.swing.JMenuItem();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
addMouseListener(new java.awt.event.MouseAdapter() {
public void mousePressed(java.awt.event.MouseEvent evt) {
doMouseClicked(evt);
}
public void mouseReleased(java.awt.event.MouseEvent evt) {
doMouseClicked(evt);
}
public void mouseClicked(java.awt.event.MouseEvent evt) {
doMouseClicked(evt);
}
});
mnuFile.setText("File");
jMenuItem1.setText("New");
jMenuItem1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
doActionPerformed(evt);
}
});
mnuFile.add(jMenuItem1);
jMenuItem2.setText("Open");
jMenuItem2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
doActionPerformed(evt);
}
});
mnuFile.add(jMenuItem2);
jMenuItem3.setText("Save");
jMenuItem3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
doActionPerformed(evt);
}
});
mnuFile.add(jMenuItem3);
jMenuItem4.setText("Close");
jMenuItem4.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
doActionPerformed(evt);
}
});
mnuFile.add(jMenuItem4);
jMenuItem5.setText("Exit");
jMenuItem5.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
doActionPerformed(evt);
}
});
mnuFile.add(jMenuItem5);
jMenuBar1.add(mnuFile);
setJMenuBar(jMenuBar1);
org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(0, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(0, 278, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
private void doActionPerformed(java.awt.event.ActionEvent evt) {
JMenuItem mi = (JMenuItem) evt.getSource();
JOptionPane.showMessageDialog(this, "Clicked " + mi.getText());
}
private void doMouseClicked(java.awt.event.MouseEvent evt) {
if (evt.isPopupTrigger()) {
JPopupMenu popupMenu = mnuFile.getPopupMenu();
popupMenu.show(this, evt.getX(), evt.getY());
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/*
* Set the Nimbus look and feel
*/
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/*
* If Nimbus (introduced in Java SE 6) is not available, stay with the
* default look and feel. For details see
* http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(PopupFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(PopupFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(PopupFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(PopupFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/*
* Create and display the form
*/
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new PopupFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JMenuItem jMenuItem1;
private javax.swing.JMenuItem jMenuItem2;
private javax.swing.JMenuItem jMenuItem3;
private javax.swing.JMenuItem jMenuItem4;
private javax.swing.JMenuItem jMenuItem5;
private javax.swing.JMenu mnuFile;
// End of variables declaration
}
抱歉，我不得不在我 3 个月大的孩子小睡时把它放在一起，所以它又快又丑：P
更新
经过一番尝试，似乎当我们自己调用弹出窗口时，我正在更改弹出窗口的父引用（invoker），这意味着当JMenu 试图显示弹出窗口时，上下文都是错误的.
我将doActionPerformed 方法更新为如下所示：
JOptionPane.showMessageDialog(this, "Clicked " + mi.getText());
JPopupMenu popupMenu = mnuFile.getPopupMenu();
popupMenu.setInvoker(mnuFile);
基本上，休息弹出窗口的客户端引用。