java远程控制详解

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;
        }
        ......
     }


    运行图示：