take screenshot using Remote webdriver

gistfile1.java

 public class ScreenShotRemoteWebDriver extends RemoteWebDriver  implements TakesScreenshot  { 
         public ScreenShotRemoteWebDriver(URL url, DesiredCapabilities  capabilities) { 
                 super(url, capabilities); 
         } 
         public <X> X getScreenshotAs(OutputType<X> target) throws  WebDriverException { 
                 if  ((Boolean)getCapabilities().getCapability(CapabilityType.TAKES_SCREENSHOT))  { 
                         return  target.convertFromBase64Png(execute(DriverCommand.SCREENSHOT).getValue().to­String()); 
                 } 
                 return null; 
         }} 
 
 ******How to use*************** 
 URL url=new URL("http://"+remoteServer+":"+remotePort+"/wd/hub"); 
 capabilities.setCapability(CapabilityType.TAKES_SCREENSHOT, true); 
 capabilities.setJavascriptEnabled(true); 
 capabilities.setBrowserName(browser); 
 driver = new ScreenShotRemoteWebDriver(url, capabilities); 
 driver.get("http://www.google.com"); 
 File temp = 
 ((ScreenShotRemoteWebDriver)driver).getScreenshotAs(OutputType.FILE); 
 FileUtils.copyFile(temp, new File("c:/copy/my/picturehere.png"));