    import java.net.URL;
    import java.net.URLConnection;
    public class Main {
    	public static void main(String[] argv) 
    	   throws Exception {
    		int size;
    		URL url = new URL("http://www.server.com");
    		URLConnection conn = url.openConnection();
    		size = conn.getContentLength();
    		if (size < 0)
    		      System.out.println("Could not determine file size."); else
    		      System.out.println("The size of file is = "+size + "bytes");
    		conn.getInputStream().close();
    	}
    }