Taking webpages snapshot using selenium server in java
===

I need to take snapshot of webpage and for that I am using selenium RC (this is good choice right ? )with eclipse for java language . I am using it as JUnit test case . Here is my code.

    package com.example.tests;
    
    import com.thoughtworks.selenium.*;
    import org.junit.After;
    import org.junit.Before;
    import org.junit.Test;
    import java.util.regex.Pattern;
    
    @SuppressWarnings("deprecation")
    public class mainClassTest extends SeleneseTestCase {
    	@Before
    	public void setUp() throws Exception {
    		selenium = new DefaultSelenium("localhost", 4444, "*firefox", "http://www.gmail.com/");
    		//water= new DefaultSelenium("localhost", 4444, "*firefox", "http://www.gmail.com/");
    		selenium.start();
    		
    	}
    
    	@Test
    	public void testFinalSelenium() throws Exception {
    		
    		
    		selenium.windowMaximize(); 
    		
    		selenium.open("/");
    		selenium.waitForPageToLoad("30000");
    		
    		
    		System.out.println("laoded\n");
    	//	selenium.wait();
    		 selenium.captureScreenshot("C:\\test\\simpleQuora.png");
    		 selenium.captureEntirePageScreenshot("C:\\test\\CompleteQuora.png", "");
    	}
    
    	@After
    	public void tearDown() throws Exception {
    		
    		selenium.stop();
    		
    	}
  
    	
    }

And it's working fine but If i have to take snapshot of multiple URLs, then what are the ways to do that ? 
Can we do it without using it as JUnit test case and using selenium in main function ?

Because if I try to run this code :

    package com.example.tests;
    
    import com.thoughtworks.selenium.DefaultSelenium;
    import com.thoughtworks.selenium.Selenium;
    
    public class MainClass {
    	
    	
    	void func(String url, String file)
    	{
    		Selenium selenium = new DefaultSelenium("localhost", 4444, "*firefox", url);
    		selenium.start();
    		
            selenium.windowMaximize(); 
    		
    		selenium.open("/");
    		selenium.waitForPageToLoad("30000");
    		
    		
    		System.out.println("laoded\n");
    	//	selenium.wait();
    		String file1= "C:\\test\\"+file+".png";
    		String file2= "C:\\test\\"+file+"2.png";
    		selenium.captureScreenshot(file1);
    		selenium.captureEntirePageScreenshot(file2, "");
    		
    		selenium.stop();
    		
    	}
    	
    
    	public static void main(String[] args)
    	{
    		
    		MainClass demo = new MainClass();
    		
    		demo.func("www.facebook.com","face"); 
    		 
    		//demo.func("www.reddit.com","reddit"); 
    		 
    	}
    }

I got <a href="http://imgur.com/YcoVw"> this error</a>.(Although I have started server from cmd). 