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
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????? 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。
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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。
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一个线程监控类ScreenScanner 如下：
public class ScreenScanner implements Runnable
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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(); } } }?
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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。
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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。
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