远程桌面组件ＡｊａｘＶＮＣ的应用和原理讲解

     最近由于项目需要学习远程监控软件,在网上查看网友关于监控软件的设计方案，同时查找是否有第三方软件提供自己集成到项目中应用组件。有童鞋说AjaxVNC开始显示监控远程桌面的功能，于是下载ＡｊａｘＶＮＣ学习使用。

　　　在SOurceForge网站下载AjaxVNC的组件。

 网址如下：

http://sourceforge.net/projects/ajaxvnc/files/ajaxvnc/ajaxvnc-r01.00/ajaxvnc-r01.00.zip

 

 

      查看AjaxVNC的源代码可以发现，AjaxVNC的原理如下，通过观察者模式TileObservable类观察桌面是否变化，如果变化，由主线程通过Swing抓取远程桌面信息形成一张JPG的图片，通过AJAX将图片的信息发送给监控者。

 

一个重点生成图片的类类如下

public class KVMManager {
    
    private boolean DEBUG = true;
    
    private Robot robot;
    private BufferedImage screenimage;
    private Rectangle screenbound;
    private HashMap keymap;
    
    /** Creates a new instance of KVMManager */
    public KVMManager() {
        if (DEBUG) System.out.println(getClass().getName() + ": KVMManager created.");
        setScreenBound(getDefaultScreenBound());
        robot = createRobot();
        screenimage = null;
        keymap = new HashMap();
        assignKeyMap();
    }
    
    private void assignKeyMap() {
        // First row
        keymap.put(new Integer(27 	), new Integer(KeyEvent.VK_ESCAPE)); // Esc
        keymap.put(new Integer(192	), new Integer(KeyEvent.VK_BACK_QUOTE)); // `
        keymap.put(new Integer(49	), new Integer(KeyEvent.VK_1)); // 1
        keymap.put(new Integer(50	), new Integer(KeyEvent.VK_2)); // 2
        keymap.put(new Integer(51	), new Integer(KeyEvent.VK_3)); // 3
        keymap.put(new Integer(52	), new Integer(KeyEvent.VK_4)); // 4
        keymap.put(new Integer(53	), new Integer(KeyEvent.VK_5)); // 5
        keymap.put(new Integer(54	), new Integer(KeyEvent.VK_6)); // 6
        keymap.put(new Integer(55	), new Integer(KeyEvent.VK_7)); // 7
        keymap.put(new Integer(56	), new Integer(KeyEvent.VK_8)); // 8
        keymap.put(new Integer(57	), new Integer(KeyEvent.VK_9)); // 9
        keymap.put(new Integer(48	), new Integer(KeyEvent.VK_0)); // 0
        keymap.put(new Integer(189	), new Integer(KeyEvent.VK_MINUS)); // -
        keymap.put(new Integer(187	), new Integer(KeyEvent.VK_EQUALS)); // =
        keymap.put(new Integer(8	), new Integer(KeyEvent.VK_BACK_SPACE)); // Backspace
        // Second row
        keymap.put(new Integer(9	), new Integer(KeyEvent.VK_TAB)); // Tab
        keymap.put(new Integer(81	), new Integer(KeyEvent.VK_Q)); // Q
        keymap.put(new Integer(87	), new Integer(KeyEvent.VK_W)); // W
        keymap.put(new Integer(69	), new Integer(KeyEvent.VK_E)); // E
        keymap.put(new Integer(82	), new Integer(KeyEvent.VK_R)); // R
        keymap.put(new Integer(84	), new Integer(KeyEvent.VK_T)); // T
        keymap.put(new Integer(89	), new Integer(KeyEvent.VK_Y)); // Y
        keymap.put(new Integer(85	), new Integer(KeyEvent.VK_U)); // U
        keymap.put(new Integer(73	), new Integer(KeyEvent.VK_I)); // I
        keymap.put(new Integer(79	), new Integer(KeyEvent.VK_O)); // O
        keymap.put(new Integer(80	), new Integer(KeyEvent.VK_P)); // P
        keymap.put(new Integer(219	), new Integer(KeyEvent.VK_OPEN_BRACKET)); // [
        keymap.put(new Integer(221	), new Integer(KeyEvent.VK_CLOSE_BRACKET)); // ]
        keymap.put(new Integer(220	), new Integer(KeyEvent.VK_BACK_SLASH)); // \
        keymap.put(new Integer(65	), new Integer(KeyEvent.VK_A)); // A
        keymap.put(new Integer(83	), new Integer(KeyEvent.VK_S)); // S
        keymap.put(new Integer(68	), new Integer(KeyEvent.VK_D)); // D
        keymap.put(new Integer(70	), new Integer(KeyEvent.VK_F)); // F
        keymap.put(new Integer(71	), new Integer(KeyEvent.VK_G)); // G
        keymap.put(new Integer(72	), new Integer(KeyEvent.VK_H)); // H
        keymap.put(new Integer(74	), new Integer(KeyEvent.VK_J)); // J
        keymap.put(new Integer(75	), new Integer(KeyEvent.VK_K)); // K
        keymap.put(new Integer(76	), new Integer(KeyEvent.VK_L)); // L
        keymap.put(new Integer(186	), new Integer(KeyEvent.VK_SEMICOLON)); // ;
        keymap.put(new Integer(222	), new Integer(KeyEvent.VK_QUOTE)); // '
        keymap.put(new Integer(13	), new Integer(KeyEvent.VK_ENTER)); // Enter
        keymap.put(new Integer(90	), new Integer(KeyEvent.VK_Z)); // Z
        keymap.put(new Integer(88	), new Integer(KeyEvent.VK_X)); // X
        keymap.put(new Integer(67	), new Integer(KeyEvent.VK_C)); // C
        keymap.put(new Integer(86	), new Integer(KeyEvent.VK_V)); // V
        keymap.put(new Integer(66	), new Integer(KeyEvent.VK_B)); // B
        keymap.put(new Integer(78	), new Integer(KeyEvent.VK_N)); // N
        keymap.put(new Integer(77	), new Integer(KeyEvent.VK_M)); // M
        keymap.put(new Integer(188	), new Integer(KeyEvent.VK_COMMA)); // ,
        keymap.put(new Integer(190	), new Integer(KeyEvent.VK_DECIMAL)); // .
        keymap.put(new Integer(191	), new Integer(KeyEvent.VK_SLASH)); // /
        keymap.put(new Integer(32	), new Integer(KeyEvent.VK_SPACE)); // Space
        keymap.put(new Integer(112	), new Integer(KeyEvent.VK_F1)); // F1
        keymap.put(new Integer(113	), new Integer(KeyEvent.VK_F2)); // F2
        keymap.put(new Integer(114	), new Integer(KeyEvent.VK_F3)); // F3
        keymap.put(new Integer(115	), new Integer(KeyEvent.VK_F4)); // F4
        keymap.put(new Integer(116	), new Integer(KeyEvent.VK_F5)); // F5
        keymap.put(new Integer(117	), new Integer(KeyEvent.VK_F6)); // F6
        keymap.put(new Integer(118	), new Integer(KeyEvent.VK_F7)); // F7
        keymap.put(new Integer(119	), new Integer(KeyEvent.VK_F8)); // F8
        keymap.put(new Integer(120	), new Integer(KeyEvent.VK_F9)); // F9
        keymap.put(new Integer(121	), new Integer(KeyEvent.VK_F10)); // F10
        keymap.put(new Integer(122	), new Integer(KeyEvent.VK_F11)); // F11
        keymap.put(new Integer(123	), new Integer(KeyEvent.VK_F12)); // F12
        keymap.put(new Integer(111	), new Integer(KeyEvent.VK_SLASH)); // /
        keymap.put(new Integer(42	), new Integer(KeyEvent.VK_ASTERISK)); // *
        keymap.put(new Integer(45	), new Integer(KeyEvent.VK_MINUS)); // -
        keymap.put(new Integer(0	), new Integer(KeyEvent.VK_7)); // 7
        keymap.put(new Integer(0	), new Integer(KeyEvent.VK_8)); // 8
        keymap.put(new Integer(0	), new Integer(KeyEvent.VK_9)); // 9
        keymap.put(new Integer(43	), new Integer(KeyEvent.VK_PLUS)); // +
        keymap.put(new Integer(0	), new Integer(KeyEvent.VK_4)); // 4
        keymap.put(new Integer(0	), new Integer(KeyEvent.VK_5)); // 5
        keymap.put(new Integer(0	), new Integer(KeyEvent.VK_6)); // 6
        keymap.put(new Integer(0	), new Integer(KeyEvent.VK_1)); // 1
        keymap.put(new Integer(0	), new Integer(KeyEvent.VK_2)); // 2
        keymap.put(new Integer(0	), new Integer(KeyEvent.VK_3)); // 3
        keymap.put(new Integer(0	), new Integer(KeyEvent.VK_0)); // 0
        keymap.put(new Integer(46	), new Integer(KeyEvent.VK_DELETE)); // Del
        keymap.put(new Integer(13	), new Integer(KeyEvent.VK_ENTER)); // Enter
        keymap.put(new Integer(36	), new Integer(KeyEvent.VK_HOME)); // Home
        keymap.put(new Integer(38	), new Integer(KeyEvent.VK_UP)); // Up
        keymap.put(new Integer(33	), new Integer(KeyEvent.VK_PAGE_UP)); // PgUp
        keymap.put(new Integer(37	), new Integer(KeyEvent.VK_LEFT)); // Left
        keymap.put(new Integer(39	), new Integer(KeyEvent.VK_RIGHT)); // Right
        keymap.put(new Integer(35	), new Integer(KeyEvent.VK_END)); // End
        keymap.put(new Integer(40	), new Integer(KeyEvent.VK_DOWN)); // Down
        keymap.put(new Integer(34	), new Integer(KeyEvent.VK_PAGE_DOWN)); // PgDn
        keymap.put(new Integer(45	), new Integer(KeyEvent.VK_INSERT)); // Ins
        keymap.put(new Integer(46	), new Integer(KeyEvent.VK_DELETE)); // Del
    }
    
    private int convAscii(int ascii) {
        Integer scancode;
        scancode = (Integer)keymap.get(new Integer(ascii));
        if (scancode==null)
            return -1;
        else
            return scancode.intValue();
    }
    
    private Robot createRobot() {
        try {
            return new Robot();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
    
    public void keyPress(int keycode) {
        int scancode = convAscii(keycode);
        if (scancode >= 0)
            robot.keyPress(scancode);
    }
    
    public void keyRelease(int keycode) {
        int scancode = convAscii(keycode);
        if (scancode >= 0)
            robot.keyRelease(scancode);
    }
    
    public void keyStroke(int keycode) {
        keyPress(keycode);
        keyRelease(keycode);
    }
    
    public void mouseMove(int x, int y) {
        robot.mouseMove(x, y);
    }
    
    public void mousePress(int buttons) {
        int mask = 0;
        System.out.println("mousePress:"+buttons);
        if ((buttons & 1) != 0) mask |= InputEvent.BUTTON1_MASK;
        if ((buttons & 2) != 0) mask |= InputEvent.BUTTON3_MASK;
        if ((buttons & 4) != 0) mask |= InputEvent.BUTTON2_MASK;
        robot.mousePress(mask);
    }
    
    public void mouseRelease(int buttons) {
        int mask = 0;
        if ((buttons & 1) != 0) mask |= InputEvent.BUTTON1_MASK;
        if ((buttons & 2) != 0) mask |= InputEvent.BUTTON3_MASK;
        if ((buttons & 4) != 0) mask |= InputEvent.BUTTON2_MASK;
        robot.mouseRelease(mask);
    }
    
    public void mouseStroke(int buttons) {
        mousePress(buttons);
        mouseRelease(buttons);
    }
    
    public void setScreenBound(Rectangle bound) {
        screenbound = bound;
        if (DEBUG) System.out.println(getClass().getName() + ": Screen setup at " + screenbound.width + "x" + screenbound.height);
    }
    
    public Rectangle getScreenBound() {
        return screenbound;
    }
    
    public Rectangle getDefaultScreenBound() {
        // get screen bound
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice gd = ge.getDefaultScreenDevice();
        return gd.getDefaultConfiguration().getBounds();
    }
    
    public BufferedImage captureScreen() {
        screenimage = robot.createScreenCapture(screenbound);
        return screenimage;
        
    }
    
    
    
}

 

 由上面AjaxVNC的源代码可以在需要监控的服务中生成一张图片。

 

 

一个线程监控类ScreenScanner 如下：

public class ScreenScanner implements Runnable

 

 public void run() {
        
        tileman.setSize((int)kvmman.getScreenBound().getWidth(), (int)kvmman.getScreenBound().getHeight());
        starttime = System.currentTimeMillis();
        while(true) {
            try {
                
                tileman.processImage(kvmman.captureScreen(), 6,6);
                notifyObservers();
                numscan++;
                //Thread.sleep(300);
                currenttime = System.currentTimeMillis();
                if (DEBUG) {
                    System.out.println(getClass().getName() + ": FPS = " + (double)numscan/(currenttime-starttime)*1000);
                }
            }
            catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
    
    private void notifyObservers()
    {
        for (int i=0; i<tileman.getNumXTile(); i++) {
            for (int j=0; j<tileman.getNumYTile(); j++) {
                if (tileman.getTile(i, j).isDirty()) {
                    tileobs.tileChanged(i, j);
                }
                tileman.getTile(i, j).clearDirty();
            }
        }
    }

 

 

 

使用如下：

1。将AjaxVNC组件中MinioHttpd.jar放在classpath路径下。

2。将AjaxVNC组件中源代码拷到，项目Src目录中。

3。将AjaxVNC组件中Bin中的几个文件拷贝到bin目录（重点是run.bat的批处理文件）

4。将相关的AJAX文件 md5.js,ajaxvnc.js,以及remotedeshtop.jsp放在web目录中。

 

启动web服务器，双击run.bat启动AjaxVNC的远程监控（其实也可以通过java程序在项目启动时自动run.bat的命令即可，减少客户操作）。远程即可看到桌面。

 在特定的文件中。

远程监控的桌面如下：http://<server ip address>:8086/remotedesktop.html

其中：server ip address：为特定的监控IP，

         8086：特定的端口。