Read a GIF or CLASS from an URL and save it locally : URLConnection « Network « Java Tutorial

1. Java Tutorial
2. Network
3. URLConnection

import java.io.DataInputStream;
import java.io.FileOutputStream;
import java.net.URL;
import java.net.URLConnection;

public class Main {
  public static void main(String args[]) throws Exception {
    byte[] b = new byte[1];
    URL url = new URL("http://www.server.com/a.gif");
    URLConnection urlConnection = url.openConnection();
    urlConnection.connect();
    DataInputStream di = new DataInputStream(urlConnection.getInputStream());

    FileOutputStream fo = new FileOutputStream("a.gif");
    while (-1 != di.read(b, 0, 1))
      fo.write(b, 0, 1);
    di.close();
    fo.close();
  }
}