package com.springmvc.controller;
...
import java.io.File;
import org.springframework.web.multipart.MultipartFile;

@Controller
@RequestMapping("/books")
public class BookController {
    ...
    @GetMapping("/add")
    public String requestAddBookForm(@ModelAttribute("NewBook") Book book) {
        return "addBook";
    }

    @PostMapping("/add")
    public String submitAddNewBook(@ModelAttribute("NewBook") Book book) {
        MultipartFile bookImage = book.getBookImage(); ➊

        String saveName = bookImage.getOriginalFilename(); ➋
        File saveFile = new File("C:\\upload", saveName);   
      
        if (bookImage != null && !bookImage.isEmpty()) {
            try {
                bookImage.transferTo(saveFile); ➌
            } catch (Exception e) {
                throw new RuntimeException("도서 이미지 업로드가 실패하였습니다", e);
            }
        }

        bookService.setNewBook(book);
        return "redirect:/books";
    }
  
    @ModelAttribute 
    public void addAttributes(Model model) { 
        model.addAttribute("addTitle", "신규 도서 등록");
    }

    @InitBinder
    public void initBinder(WebDataBinder binder) {
        binder.setAllowedFields("bookId", "name", "unitPrice", "author", "description", "publisher", "category", "unitsInStock", "totalPages", "releaseDate", "condition", "bookImage"); ➍
    }
}