How do I use java.net class to get remote listing of files.

Dear Experts Exchange,
 
the following code list files in a directory, so if I type "javac ListFiles c:\projects" I see all files and directories in "c:\projects".
 
package listfiles;
import java.io.*;
public class Main {
   
    public Main() {
    }
   
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        String dir = args.length > 0 ? args[0]: "."; //pass directory to list or current dir
        //Get an array of only text files in the directory.
        String[] files = new File(dir).list();
        System.out.println("running my file listing test");
        for (int i=0; i<files.length; i++) {
            File current = new File(files[i]);
            System.out.println(current.getName()+", "+
            String.valueOf(current.lastModified()));
        }            
    }
   
--------------------------------
I get output like
 
run:
running my file listing test
200300N-1526E.aux, 0
200300N-1526E.tif, 0
atcf, 0
bookstore, 0
------------------------------------------------------------------------------
Questions:
 
I would like to do the same for a URL, so I type "javac ListUrlFiles http:\\www.text.com\data"
 
is see all files in the directory supported by a web server (where http:\\www.txt.com\data is somethign like /usr/local/apache/htdocs/data).
 
1) Can someone show me how to do list all files as a function of URL, with say java.net.*.
 
2) Also, I expected to get a unixtime stamp when calling current.lastModified() but instead getting a "0"