Java JDK1.4 的Robot对象，该对象可以完成屏幕图像截取操作，控制鼠标，键盘，如此便可以轻而易举地实现远程服务器的控制。本文向大家介绍如何用Java Robot对象实现远程服务器的控制，并给出了相应的Java源代码。
实现原理：
（1）被控端通过Robot截取桌面图像通过socket通信传给主控端。
（2）主控端显示被控端桌面，并且把基于被控端图像上的键盘，鼠标事件通过socket通信传给被控端。
（3）被控端响应主控端的鼠标键盘事件。
实现详解：
（一）主控端和被控端通过UDP进行指令交互
/*-主控端向被控端发送指令-*/
String command = ...; //指令
InetAddress inet = ...; //被控端地址
int port = ...; //端口
byte sp[] = command.getBytes();
DatagramPacket packet = new DatagramPacket(sp,sp.length(),inet,port);
DatagramSocket sd = new DatagramSocket();
sd.send(packet);
/*-被控端接收指令-*/
DatagramSocket stockUDP = ...;
DatagramPacket packet = ...;
stockUDP.receive(packet);
String message=new String(packet.getData(),0,packet.getLength()); //得到指令
本程序中用到的指令
public static final String Command_Connection = "connection" ; //建立连接
public static final String Command_Disconnection = "disconnection";//断开连接
public static final String Command_Screen = "screen"; //显示被控端屏幕
public static final String Command_Control="control"; //建立控制套接
（二）被控端向主控端传递图像
/*-被控端获取屏幕图像-*/
Rectangle rect = new Rectangle(Toolkit.getDefaultToolkit().getScreenSize());//全屏区域
Robot robot=new Robot();
BufferedImage image = robot.createScreenCapture(rect);
/*-开启图像传送线程-*/
Socket socket = ...;
OutputStream out = socket.getOutputStream();
BufferedImage image ;
JPEGImageEncoder encoder =JPEGCodec.createJPEGEncoder(out);
......
public void run(){
while(true){
image = ...; //获取屏幕图像
encoder.encode(image); //发送图像给主控端
Thread.sleep(Environment.IMAGE_GETTIME); //图像采集时间间隔
}
}
/*-主控端图像接收线程-*/
JPEGImageDecoder de = JPEGCodec.createJPEGDecoder(socket.getInputStream());
BufferedImage image = null ;
......
public void run(){
while(true){
image = de.decodeAsBufferedImage();
if (image != null) {
/*显示图像*/
}
}
}
（三）图像显示，鼠标，键盘监听
/*-图像显示-*/
public class ControlledScreenPanel extends JPanel implements MouseMotionListener,
MouseListener,MouseWheelListener ,KeyListener{
private BufferedImage image ;
public void setBufferedImage(BufferedImage bi) { //更新图像
image = bi;
Dimension d = new Dimension(image .getWidth(this),image .getHeight(this));
setPreferredSize(d);
revalidate();
repaint();
}
public void paintComponent(Graphics g) { //绘制图像
super.paintComponent(g);
Dimension d = getSize();
g.setColor(getBackground());
g.fillRect(0, 0, d.width, d.height);
if (image != null) {
g.drawImage(image , 0, 0, this);
}
}
}
/*-鼠标，键盘监听-*/
private MainControlSocket control ; //发送鼠标，键盘事件到被控端
public void mouseDragged(MouseEvent e) {
control.sendControlledAction(e);
}
public void mouseMoved(MouseEvent e) {
control.sendControlledAction(e);
}
//--------------------------------------------------------------------------
public void mouseClicked(MouseEvent e) {
requestFocus();//单击获得焦点
}
public void mousePressed(MouseEvent e) { //鼠标按下
control.sendControlledAction(e);
}
public void mouseReleased(MouseEvent e) { //鼠标释放
control.sendControlledAction(e);
}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
//--------------------------------------------------------------------------
public void mouseWheelMoved (MouseWheelEvent e){ //滑轮滚动
control.sendControlledAction(e);
}
//--------------------------------------------------------------------------
public void keyTyped(KeyEvent e) {}
public void keyPressed(KeyEvent e) { //键盘按下
control.sendControlledAction(e);
}
public void keyReleased(KeyEvent e) { //键盘释放
control.sendControlledAction(e);
}
/*-发送鼠标，键盘事件到被控端-*/
class MainControlSocket {
private Socket socket = null;
private ObjectOutputStream out = null; //事件对象发送封装
......
public void sendControlledAction(InputEvent event) {
try {
out.writeObject(event);
}
catch (IOException e) {
e.printStackTrace();
}
}
......
}
（三）被控端接收，响应键盘鼠标事件
private Socket socket = ...;
private ObjectInputStream in = new ObjectInputStream(socket.getInputStream());
private Robot action = new Robot();
public void run(){
......
while(true){
Object obj = in.readObject(); //获得鼠标键盘事件
if (obj != null) {
handleEvent( (InputEvent) obj); //处理鼠标键盘事件
}
}
......
}
private void handleEvent(InputEvent event){
MouseEvent mevent = null ; //鼠标事件
MouseWheelEvent mwevent = null ;//鼠标滚动事件
KeyEvent kevent = null ; //键盘事件
int mousebuttonmask = -100; //鼠标按键
switch (event.getID()){
case MouseEvent.MOUSE_MOVED : //鼠标移动
mevent = ( MouseEvent )event ;
action.mouseMove( mevent.getX() , mevent.getY() );
break ;
case MouseEvent.MOUSE_PRESSED : //鼠标键按下
mevent = ( MouseEvent ) event;
action.mouseMove( mevent.getX() , mevent.getY() );
mousebuttonmask = getMouseClick( mevent.getButton() );
if(mousebuttonmask != -100)
action.mousePress(mousebuttonmask);
break;
case MouseEvent.MOUSE_RELEASED : //鼠标键松开
mevent = ( MouseEvent ) event;
action.mouseMove( mevent.getX() , mevent.getY() );
mousebuttonmask = getMouseClick( mevent.getButton() );//取得鼠标按键
if(mousebuttonmask != -100)
action.mouseRelease( mousebuttonmask );
break ;
case MouseEvent.MOUSE_WHEEL : //鼠标滚动
mwevent = ( MouseWheelEvent ) event ;
action.mouseWheel(mwevent.getWheelRotation());
break ;
case MouseEvent.MOUSE_DRAGGED : //鼠标拖拽
mevent = ( MouseEvent ) event ;
action.mouseMove( mevent.getX(), mevent.getY() );
break ;
case KeyEvent.KEY_PRESSED : //按键
kevent = ( KeyEvent ) event;
action.keyPress( kevent.getKeyCode() );
break ;
case KeyEvent.KEY_RELEASED : //松键
kevent= ( KeyEvent ) event ;
action.keyRelease( kevent.getKeyCode() );
break ;
default: break ;
}
}
private int getMouseClick(int button) { //取得鼠标按键
if (button == MouseEvent.BUTTON1) //左键 ,中间键为BUTTON2
return InputEvent.BUTTON1_MASK;
if (button == MouseEvent.BUTTON3) //右键
return InputEvent.BUTTON3_MASK;
return -100;
}
......
}