JPopupMenu的使用以及JPopupMenu中子组件的事件处理

方法一：

import java.awt.FlowLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.*;

public class JPopupMenuTest extends JFrame {
 public JPopupMenuTest() {
  JButton button = new JButton("登录");
  this.add(button);
  //为按钮添加单击事件
  button.addMouseListener(new MouseAdapter() {
   @Override
   public void mouseClicked(MouseEvent e) {
    System.out.println("按到了");
   }
  });  
  final String id= button.getText();
  //为按钮创建一个右键菜单
  JPopupMenu pop = new JPopupMenu(id);
  JMenuItem item1 = new JMenuItem("功能1");
  item1.addMouseListener(new MouseAdapter(){
   public void mouseReleased(MouseEvent e) {
    System.out.println(id);//输出按钮的文本
   }
  });
  pop.add(item1);
  button.setComponentPopupMenu(pop);//将按钮与右键菜单关联
  

  this.setLayout(new FlowLayout());
  this.setBounds(100, 100, 300, 300);
  this.setVisible(true);

 }

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

 }

}

方法二：

import java.awt.FlowLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.*;

public class JPopupMenuTest extends JFrame {
 public JPopupMenuTest() {    
  JButton button2 = new JButton("101");
  this.add(button2);
  button2.addMouseListener(new MouseAdapter() {
   @Override
   public void mouseReleased(MouseEvent e) {   
    showPopupMenu(e);
   }
  });
  this.setLayout(new FlowLayout());
  this.setBounds(100, 100, 300, 300);
  this.setVisible(true);

 }

 private void showPopupMenu(MouseEvent e) {
  // 如果当前事件与右键菜单有关（单击右键），则弹出菜单
  if (e.isPopupTrigger()) {
   JPopupMenu pop = new JPopupMenu("id1");
   final String sid = ((JButton) e.getComponent()).getText();
   JMenuItem item1 = new JMenuItem("功能1");
   item1.addMouseListener(new MouseAdapter(){
    public void mouseReleased(MouseEvent e) {
     System.out.println(sid);
    }
   });
   pop.add(item1);
   //e.getComponent()表示与右键菜单关联的组件，这里指button2  
   pop.show(e.getComponent(), e.getX(), e.getY());
  }else{//如果是正常单击（左键）
   System.out.println("按到了");
  }
 }

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