给树节点做下拉菜单

Question

。。给jtree 节点上做下拉菜单(jpopumenu)
  怎样才能做到右键点击节点 让那个节点得到选中并弹出下拉菜单   我只能做到。。左键选择一个节点后 再弹出下拉菜单

Answer 1

话说JAVA 做桌面应用小程序。。没.NET 强大啊
 郁闷  这问题蛋疼纠结了几天 让节点得到焦点也不行

Answer 2

为了保住LZ的蛋蛋，帮忙用Netbeans写了个例子。重点看下监听方法jTree1MousePressed，其他的代码都是拖拖拽拽出来的/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 *//*
 * NewJFrame.java
 *
 * Created on 2010-6-12, 20:54:26
 */package study;import java.awt.event.MouseEvent;
import javax.swing.tree.TreePath;/**
 *
 * @author Administrator
 */
public class NewJFrame extends javax.swing.JFrame {    /** Creates new form NewJFrame */
    public NewJFrame() {
        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() {        jPopupMenu1 = new javax.swing.JPopupMenu();
        jMenuItem1 = new javax.swing.JMenuItem();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTree1 = new javax.swing.JTree();        jMenuItem1.setText("测试");
        jMenuItem1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jMenuItem1ActionPerformed(evt);
            }
        });
        jPopupMenu1.add(jMenuItem1);        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);        jTree1.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mousePressed(java.awt.event.MouseEvent evt) {
                jTree1MousePressed(evt);
            }
        });
        jScrollPane1.setViewportView(jTree1);        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 300, Short.MAX_VALUE)
        );        pack();
    }// </editor-fold>    private void jTree1MousePressed(java.awt.event.MouseEvent evt) {                                    
        // TODO add your handling code here:
        if (evt.getButton() == MouseEvent.BUTTON3)
        {
            TreePath path = jTree1.getClosestPathForLocation(evt.getX(), evt.getY());
            jTree1.setSelectionPath(path);
            jPopupMenu1.show(jTree1, evt.getX(), evt.getY());
        }
        else
        {
            jPopupMenu1.setVisible(false);
        }
    }                                       private void jMenuItem1ActionPerformed(java.awt.event.ActionEvent evt) {                                           
        // TODO add your handling code here:
    }                                              /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new NewJFrame().setVisible(true);
            }
        });
    }    // Variables declaration - do not modify
    private javax.swing.JMenuItem jMenuItem1;
    private javax.swing.JPopupMenu jPopupMenu1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTree jTree1;
    // End of variables declaration}