怎么给JAVA画布设置鼠标键盘Listener

package org.tristone.jgf.test; import java.awt.event.KeyListener; import java.awt.event.MouseListener; import java.awt.event.MouseMotionListener; import java.awt.event.MouseWheelListener; import java.awt.event.KeyEvent; import java.awt.event.MouseEvent; import java.awt.event.MouseWheelEvent; import java.awt.GraphicsEnvironment; import java.awt.HeadlessException; import java.awt.AWTException; import java.awt.Robot; import javax.media.opengl.GLCanvas; public class MyInput implements KeyListener,MouseListener,MouseMotionListener,MouseWheelListener { GLCanvas canvas; Robot robot = null; public MyInput(GLCanvas canvas) { setListeners(canvas); // try // { // robot = new Robot(GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice()); // } // catch (HeadlessException e) // { // } // catch (AWTException e) // { // } } public void setListeners(GLCanvas canvas) { if(this.canvas != null) { canvas.removeKeyListener(this); canvas.removeMouseListener(this); canvas.removeMouseMotionListener(this); canvas.removeMouseWheelListener(this); } canvas.addKeyListener(this); canvas.addMouseListener(this); canvas.addMouseMotionListener(this); canvas.addMouseWheelListener(this); this.canvas = canvas; } @Override public void keyPressed (KeyEvent e) { synchronized (this) { System.out.print("keyPressed\n"); } } @Override public void keyReleased (KeyEvent e) { synchronized (this) { System.out.print("keyReleased\n"); } } @Override public void keyTyped (KeyEvent e) { synchronized (this) { System.out.print("keyTyped\n"); } } @Override public void mouseClicked (MouseEvent arg0) { System.out.print("mouseClicked\n"); } @Override public void mouseEntered (MouseEvent e) { System.out.print("mouseEntered\n"); } @Override public void mouseExited (MouseEvent e) { System.out.print("mouseExited\n"); } @Override public void mousePressed (MouseEvent e) { synchronized (this) { System.out.print("mousePressed\n"); } } @Override public void mouseReleased (MouseEvent e) { synchronized (this) { System.out.print("mouseReleased\n"); } } @Override public void mouseDragged (MouseEvent e) { synchronized (this) { System.out.print("mouseDragged\n"); } } @Override public void mouseMoved (MouseEvent e) { synchronized (this) { System.out.print("mouseMoved\n"); } } @Override public void mouseWheelMoved (MouseWheelEvent e) { synchronized (this) { System.out.print("mouseWheelMoved\n"); } } }