Resolve a relative URL : URL « Network « Java Tutorial

1. Java Tutorial
2. Network
3. URL

import java.net.URL;

public class Main {
  public static void main(String[] argv) throws Exception {
    URL relativeURL, baseURL;
    baseURL = new URL("http://www.yourserver.com/");
    relativeURL = new URL(baseURL, "./a.htm");
    System.out.println(relativeURL.toExternalForm());

  }
}