Hey Nitya, you can use executeScript() method of JavaScript Executor to get a webpage's details like url, name, domain etc. Below code snippet shows how to do it:
        WebDriver driver= new FirefoxDriver();			
        		
        //Creating the JavascriptExecutor interface object by Type casting		
        JavascriptExecutor js = (JavascriptExecutor)driver;		
        		
        //Launching the Site.		
        driver.get("https://www.facebook.com/");
			
        //Fetching the Domain Name of the site. Tostring() change object to name.		
        String DomainName = js.executeScript("return document.domain;").toString();			
        System.out.println("Domain name of the site = "+DomainName);					
          		
        //Fetching the URL of the site. Tostring() change object to name		
        String url = js.executeScript("return document.URL;").toString();			
        System.out.println("URL of the site = "+url);					
          		
       //Method document.title fetch the Title name of the site. Tostring() change object to name		
       String TitleName = js.executeScript("return document.title;").toString();			
       System.out.println("Title of the page = "+TitleName);