How to create a robot using requests in Java?

I have been interested in making robots to perform small repetitive and boring tasks. I use a class of Java called Robot. However, I think the way I'm doing is not the most appropriate, because it's a pretty handy robot that works with mouse and keyboard events. I would like to develop one based on server requests ( GET and POST for example), but I do not know which class or what resources and techniques to use.

Here is an example code of "handmade robots":

import java.awt.AWTException;
import java.awt.Robot;
import java.awt.event.KeyEvent;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;

public class Robo {

    public static void main(String[] args) throws AWTException, IOException,
            URISyntaxException {
        Robot robot = new Robot();

        int login[] = {
            KeyEvent.VK_L,
            KeyEvent.VK_O,
            KeyEvent.VK_G,
            KeyEvent.VK_I,
            KeyEvent.VK_N,
        };

        int senha[] = {
            KeyEvent.VK_1,
            KeyEvent.VK_2,
            KeyEvent.VK_3,
            KeyEvent.VK_4,
            KeyEvent.VK_5,
            KeyEvent.VK_6,
            KeyEvent.VK_7,
            KeyEvent.VK_8,
            KeyEvent.VK_9,
            KeyEvent.VK_0};

        java.awt.Desktop.getDesktop().browse(
                new URI("https://registro.br/cgi-bin/nicbr/login"));
        robot.delay(3000);

        //Login
        for (int i = 0; i < login.length; i++) {
            robot.keyPress(login[i]);
            robot.delay(100);
            robot.keyRelease(login[i]);
            robot.delay(300);
        }
        robot.delay(200);
        robot.keyPress(KeyEvent.VK_TAB);
        robot.delay(100);
        robot.keyRelease(KeyEvent.VK_TAB);
        robot.delay(1000);

        //Senha
        for (int j = 0; j < senha.length; j++) {
            robot.keyPress(senha[j]);
            robot.delay(100);
            robot.keyRelease(senha[j]);
            robot.delay(300);
        }
        robot.keyPress(KeyEvent.VK_ENTER);
        robot.delay(100);
        robot.keyRelease(KeyEvent.VK_ENTER);
        robot.delay(1000);

        try {
            for (int i = 0, j = 1000; i < 1000; i++, j--) {
                robot.mouseMove(i, j);
                robot.delay(5);
            }
            robot.delay(500);
            //robot.mousePress(InputEvent.BUTTON1_MASK);
            //robot.mouseRelease(InputEvent.BUTTON1_MASK);
        } catch (Exception ex) {
            System.out.println(ex.getMessage());
        }
        robot.delay(200);
    }
}