controller/ArticleController.java

(중략)
import org.springframework.web.bind.annotation.PostMapping;

@Controller
public class ArticleController {
    @GetMapping("/articles/new")
    public String newArticleForm() {
        return "articles/new";
    }

    @PostMapping("/articles/create") --- ➋ URL 요청 접수
    public String createArticle() { ---- ➊ 메서드 생성 및 반환값 작성
        return "";
    }

}