java swing 下拉框增加回车事件

用java swing做了一个密码管理系统，如下图：

 最下面有一个输入框，是用于搜索的，有三种搜索方式：

（1）通过Title

（2）通过username

（3）通过description

在下拉框中选择。现在的需求是

在输入框中输入要搜索的关键字后，选择下拉框，然后直接回车就进行搜索（对下拉框回车触发【search】按钮单击事件）。

说明：下拉框JComboBox typeComboBox ，搜索按钮 JButton searchBtn

刚开始使用如下代码：

typeComboBox.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				searchBtn.doClick();
			}
		});

 但是测试之后发现并不是响应下拉框的回车事件，而是下拉框的单击事件。

 

最后在 http://zhidao.baidu.com/question/233793038.html 上找到了回车事件实现的方法：

typeComboBox = new JComboBox();
		searchPanle.add(typeComboBox);
		typeComboBox.addItem(combobox_title);
		typeComboBox.addItem(combobox_desc);
		typeComboBox.addItem(combobox_username);
		typeComboBox.addKeyListener(new KeyAdapter() {
			@Override
			public void keyPressed(KeyEvent e) {
				if (e.getKeyCode() == KeyEvent.VK_ENTER) {
					searchBtn.doClick();
				}
			}
		});

 作者:[e-mail]

评论

2 楼 animamihong 2014-07-24  

public class JComboBoxPopupMenuTest {

        public static void main(String[] args) {
                JFrame jf = new JFrame("JComboBox Test");
                jf.setSize(200, 120);
                final JComboBox jcb = new JComboBox(new String[] { "1", "2", "3" });
                jf.getContentPane().add(jcb, BorderLayout.NORTH);
                jcb.setEditable(true);
                final JPopupMenu jpm = new JPopupMenu();
                jpm.add(new JMenuItem("Select Me!"));
                jpm.add(new JMenuItem("Don't Select Me!"));
                jpm.setSize(10, 30);
                jcb.getEditor().getEditorComponent().addMouseListener(
                                new MouseAdapter() {
                                        public void mouseReleased(MouseEvent evt) {
                                                System.out.println("Mouse Event Caught");
                                                if (SwingUtilities.isRightMouseButton(evt)) {
                                                        System.out.println("Right Click");
                                                        jpm
                                                                        .show(evt.getComponent(), evt.getX(), evt
                                                                                        .getY());
                                                }
                                        }

                                });
                jf.show();
                jcb.addKeyListener(new KeyAdapter() { 
                    @Override 
                    public void keyPressed(KeyEvent e) { 
                        if (e.getKeyCode() == KeyEvent.VK_ENTER) { 
                        System.out.println("ssssssssssssssssssssss");
                        } 
                    } 
                }); 
        }
}

为什么下拉框的回车事件不起作用

1 楼 sosojustdo 2013-11-04  

JavaSwing的确落伍了点，包括实现复杂度以及面临数据量大高并发线程安全等问题制约。楼主学习精神还是值得称赞的。