How to convert url of html page to pdf in java using iText & flying saucer?

Question

I've just downloaded xhtmlrenderer and iText jar files. I can make pdf files by using these jars.

What I exactly want is: I need to create pdf if I give one valid URL (say "https://xhtmlrenderer.dev.java.net/news.html") in the place of "inputFile". Is it possible with flying saucer and iText?

If yes, please guide me to achieve this.

Also, when I'm trying to run the below code, I'm getting error: stream closed

import java.io.*;
import com.lowagie.text.DocumentException;
import org.xhtmlrenderer.pdf.ITextRenderer;

public class FirstDoc {

    public static void main(String[] args) 
            throws IOException, DocumentException {
        String inputFile = "samples/sql.html";
        String url = new File(inputFile).toURI().toURL().toString();
        String outputFile = "firstdoc.pdf";
        OutputStream os = new FileOutputStream(outputFile);

        ITextRenderer renderer = new ITextRenderer();
        renderer.setDocument(url);
        renderer.layout();
        renderer.createPDF(os);

        os.close();
    }
}