How to take screenshot of the test page?

We can take entire page screenshot by following code:

   //Instantiate any WebDriver; Eg. Firefox
    WebDriver driver = new FirefoxDriver();
    driver.get("http://seleniumwebdriverfaq.tumblr.com/");
    //Get the screenshot as file
    File scrFile = ((TakesScreenshot)driver).getScreenshotAs(OutputType.FILE);
    // Copy the screenshot to your file system
    FileUtils.copyFile(scrFile, new File("c:\screenshots\screenshot.png"));