Java by API/java.net/Authenticator

Authenticator: setDefault(Authenticator a)

  

import java.io.DataInputStream;
import java.net.Authenticator;
import java.net.HttpURLConnection;
import java.net.PasswordAuthentication;
import java.net.URL;
import java.util.Properties;
public class Main {
  public static void main(String[] argv) throws Exception {
    byte[] b = new byte[1];
    Properties systemSettings = System.getProperties();
    systemSettings.put("http.proxyHost", "proxy.mydomain.local");
    systemSettings.put("http.proxyPort", "80");
    Authenticator.setDefault(new Authenticator() {
      protected PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication("mydomain\\username", "password".toCharArray());
      }
    });
    URL u = new URL("http://www.google.ru");
    HttpURLConnection con = (HttpURLConnection) u.openConnection();
    DataInputStream di = new DataInputStream(con.getInputStream());
    while (-1 != di.read(b, 0, 1)) {
      System.out.print(new String(b));
    }
  }
}

extends Authenticator

  
import java.io.BufferedInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.Authenticator;
import java.net.PasswordAuthentication;
import java.net.URL;
public class MainClass {
  public static void main(String args[]) throws Exception {
    Authenticator.setDefault(new DialogAuthenticator());
    URL u = new URL("secure url");
    InputStream in = u.openStream();
    in = new BufferedInputStream(in);
    Reader r = new InputStreamReader(in);
    int c;
    while ((c = r.read()) != -1) {
      System.out.print((char) c);
    }
  }
}
class DialogAuthenticator extends Authenticator {
  public DialogAuthenticator() {
  }
  public PasswordAuthentication getPasswordAuthentication() {
    return new PasswordAuthentication("username", "password".toCharArray());
  }
}