如何在java中实现右键d出式菜单

public void mouseReleased(MouseEvent e)

{

if(e.getButton() == MouseEvent.BUTTON3)//点击右键

popUpMenu.show(editMenu, e.getX(), e.getY())

//popUpMenu是一个JPopupMenu editMenu是一个JMenu

//e.getX(), e.getY()是获得鼠标点击的坐标 在点击的地方d出一个 editMenu,editMenu中的 内容自己添加

}

public void mouseClicked(MouseEvent e) {

if(e.getButton() == MouseEvent.BUTTON1)//点击鼠标左键

popUpMenu.setVisible(false)//d出菜单消失

}

根据你的要求，改完的程序如下：（改动的地方见注释，未写入的程序不需要改动）

主要是把JTextArea text改成JTextArea text=new JTextArea()

加了右击d出菜单一段。

import java.awt.*import java.awt.event.*

import javax.swing.*

import java.io.*

public class jishiben extends JFrame{

File file=null

private JLabel stateBar

private JTextArea text=new JTextArea()//这里把JTextArea text改成JTextArea text=new JTextArea()

private JMenuBar mb

private JMenu files, edit, help

private JMenuItem Open,New,Save,SaveAs,Exit,Cut,Copy,Paste,Delete,SelectAll,About

public jishiben()

//构造函数

{

super("我的记事本")

//菜单栏

mb=new JMenuBar()

files=new JMenu("文件")

edit=new JMenu("编辑")

help=new JMenu("帮助")

About=new JMenuItem("关于")

Open=new JMenuItem("打开") //文件菜单的下拉菜单

New=new JMenuItem("新建")

Save=new JMenuItem("保存")

SaveAs=new JMenuItem("另存为")

Exit=new JMenuItem("退出")

Cut=new JMenuItem("剪切") //编辑菜单的下拉菜单

Copy=new JMenuItem("复制")

Paste=new JMenuItem("粘贴")

Delete=new JMenuItem("删除")

SelectAll=new JMenuItem("全选")

stateBar=new JLabel("未修改")

//右击d出菜单 //这里加一段

JPopupMenu menu = new JPopupMenu()

JMenuItem menuItemCut = new JMenuItem("剪切")

JMenuItem menuItemCopy = new JMenuItem("复制")

JMenuItem menuItemDelete = new JMenuItem("删除")

menu.add(menuItemCut)

menu.add(menuItemCopy)

menu.add(menuItemDelete)

text.setComponentPopupMenu(menu)

menuItemCut.addActionListener(new actionListener())

menuItemCopy.addActionListener(new actionListener())

menuItemDelete.addActionListener(new actionListener())

//添加标签

stateBar.setHorizontalAlignment(SwingConstants.LEFT)

stateBar.setBorder(BorderFactory.createEtchedBorder())

mb.add(files)mb.add(edit)mb.add(help)

files.add(New)files.add(Open)files.add(Save)files.add(SaveAs)files.addSeparator() //分割线

files.add(Exit)

edit.add(Cut)edit.add(Copy)edit.add(Paste)edit.add(Delete) //分割线

edit.add(SelectAll)

help.add(About)

setJMenuBar(mb)

//text=new JTextArea() //这里去掉一句移到上面

add(new JScrollPane(text))//滚动面板

setSize(600,500)

setVisible(true)

}

class actionListener implements ActionListener{

public void actionPerformed(ActionEvent e) {

}

}

public static void main(String[] args) {

new jishiben()

}

}

import javax.swing.*

import java.awt.*

import java.awt.event.*

public class ExamplePop {

JFrame frame

JTextAreaMenu textmenu

private JScrollPane pane

public ExamplePop(){

init()

}

private void init(){

frame =new JFrame("测试右键菜单")

textmenu=new JTextAreaMenu()

pane =new JScrollPane(textmenu)

frame.add(pane)

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)

frame.setSize(300, 200)

frame.setVisible(true)

}

public static void main(String[] args){

try { // 使用Windows的界面风格

UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel")

} catch (Exception e) {

e.printStackTrace()

}

new ExamplePop()

}

class JTextAreaMenu extends JTextArea implements MouseListener{

private JPopupMenu pop = null// d出菜单

private JMenuItem copy = null, paste = null, cut = null// 三个功能菜单

public JTextAreaMenu() {

super()

init()

}

private void init() {

this.addMouseListener(this)

pop = new JPopupMenu()

pop.add(copy = new JMenuItem("复制"))

pop.add(paste = new JMenuItem("粘贴"))

pop.add(cut = new JMenuItem("剪切"))

this.add(pop)

}

public void mouseClicked(MouseEvent e) {

}

public void mouseEntered(MouseEvent e) {

}

public void mouseExited(MouseEvent e) {

}

public void mousePressed(MouseEvent e) {

if (e.getButton() == MouseEvent.BUTTON3) {

pop.show(this, e.getX(), e.getY())

}

}

public void mouseReleased(MouseEvent e) {

}

}

}

---