File size from URL : URL « Network « Java Tutorial

1. Java Tutorial
2. Network
3. URL

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(size);
    conn.getInputStream().close();

  }
}