선택 상자로 생년월일 만들기

    <div>
        <select id="birtyday" name="birthday">
            <option th:each="i : ${#numbers.sequence(2020, 1920)}"
                th:value="${i}" th:text="${i}" th:selected="${i == birthYear}">
            </option>
        </select>

        <select id="birthMonth" name="birthMonth">
            <option th:each="i : ${#numbers.sequence(1, 12)}" th:value="${i}"
                th:text="${i}" th:selected="${i == birthMonth}"></option>
        </select>

        <select id="birthDay" name="birthDay">
            <option th:each="i : ${#numbers.sequence(1, 31)}" th:value="${i}"
                th:text="${i}" th:selected="${i == birthDay}"></option>
        </select>
    </div>

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;

@Controller
public class Birth {

    @GetMapping("/index")
    public String getIndex(Model model) {
        int birthYear = 2002;
        int birthMonth = 8;
        int birthDay = 3;

        model.addAttribute("birthYear", birthYear);
        model.addAttribute("birthMonth", birthMonth);
        model.addAttribute("birthDay", birthDay);

        return "index";
    }
}