直接按键设置组件的快捷方式

     在很多界面设计中要求给组件设置热键，而这些热键可以由用户修改。用户在修改时只需按键就可以直接操作，这样很方便。

这里主要就是将如何从键盘的输入中获取正确的快捷键设置。

下面直接插入代码：

/** *All rights reserved,2010,mengke */package com.mengke.j2se.util.test;import java.awt.Dimension;import java.awt.event.KeyEvent;import java.awt.event.KeyListener;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JTextField;/** *@author mengke *@email [e-mail] *@version 2011-1-18下午10:51:31 */public class KeyListenerTest implements KeyListener {private boolean setted;private int keyCode;final JTextField textField = new JTextField();public static void main(String[] args) {System.out.println(9 & 6);KeyListenerTest test = new KeyListenerTest();test.showUI();}public void showUI() {JFrame frame = new JFrame();JPanel panel = new JPanel();textField.setEditable(false);textField.setPreferredSize(new Dimension(160, 30));textField.addKeyListener(this);panel.add(textField);frame.setContentPane(panel);frame.setSize(new Dimension(200, 300));frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setVisible(true);}@Overridepublic void keyPressed(KeyEvent e) {String key = "";int keyCode = e.getKeyCode();if (e.isAltDown()) {key += "Alt + ";}if (e.isControlDown()) {key += "Ctrl + ";}if (e.isShiftDown()) {key += "Shift + ";}String keyChar = getKeyChar(e.getKeyCode());if (keyChar != null) {key += keyChar;}this.keyCode = keyCode;textField.setText(key);textField.updateUI();if (keyChar != null && keyCode != KeyEvent.VK_SHIFT && keyCode != KeyEvent.VK_ALT&& keyCode != KeyEvent.VK_CONTROL) {setted = true;} else {setted = false;}System.out.println("press:" + key);}@Overridepublic void keyReleased(KeyEvent e) {if (setted == true) {return;}String key = "";int keyCode = e.getKeyCode();if (keyCode != KeyEvent.VK_ALT && keyCode != KeyEvent.VK_CONTROL && keyCode != KeyEvent.VK_SHIFT) {System.out.println("wu");textField.setText("无");textField.updateUI();return;}if (!e.isAltDown() && !e.isShiftDown() && !e.isControlDown()) {System.out.println("wu");textField.setText("无");textField.updateUI();return;}if (e.isAltDown()) {key += "Alt + ";}if (e.isControlDown()) {key += "Ctrl + ";}if (e.isShiftDown()) {key += "Shift + ";}key += KeyEvent.getKeyText(this.keyCode);textField.setText(key);textField.updateUI();System.err.println("release:" + key);}@Overridepublic void keyTyped(KeyEvent e) {}/** * 这里可以设定哪些按键是需要获取的 * * @param keyCode * @return */public String getKeyChar(int keyCode) {if (KeyEvent.VK_0 <= keyCode && KeyEvent.VK_9 >= keyCode || KeyEvent.VK_NUMPAD0 <= keyCode&& KeyEvent.VK_NUMPAD9 >= keyCode || KeyEvent.VK_A <= keyCode && KeyEvent.VK_Z >= keyCode|| KeyEvent.VK_F1 <= keyCode && KeyEvent.VK_F24 >= keyCode) {return KeyEvent.getKeyText(keyCode);}return null;}}

 该代码演示了获取用户设置快捷键的方式。比如在用户按下Ctrl键时，JTextField中将显示Ctrl + ，表示热键还没有设置完成，如图：

如果此时用户松开按键，则显示 无，表示用户每有设置热键，如果用户 在按下Ctrl 键的同时，按下了其他键，比如A键，则显示为 Ctrl + A ,如图：

此时已经是一个完整的热键了，此时松开按键，JTextField的文本内容将不变，表示用户希望设置Ctrl + A 来设置快捷键。其他按键功能类似。