Tùy chỉnh ngoại lệ không tìm thấy tài nguyên khi duyệt web trong Spring MVC

	@Controller
	public class BookController {
	private static final Logger logger = LoggerFactory.getLogger(BookController.class);
	@Autowired
	@Qualifier("bookService")
	private BookService bookService;
	@Autowired
	@Qualifier("cartBean")
	private Cart cartBean;
	@ExceptionHandler(ResourceNotFoundException.class)
	public String handleResourceNotFoundException(HttpServletRequest request) {
	HttpSession session = request.getSession(true);
	session.setAttribute("cartBean", cartBean);
	return "404page";
	}
	@RequestMapping(value = "/book/detail/{bookId}")
	@SuppressWarnings("unchecked")
	public String details(@PathVariable("bookId") long bookId, Model model, HttpServletRequest request) {
	logger.info("Show Book Detail Page");
	HttpSession session = request.getSession(false);
	Book book = null;
	if (session != null && session.getAttribute("books") != null) {
	List<Book> books = (List<Book>) session.getAttribute("books");
	for (Book b : books) {
	if (b.getId() == bookId) {
	book = b;
	model.addAttribute("book", b);
	break;
	}
	}
	if (book == null) {
	throw new ResourceNotFoundException();
	}
	} else {
	book = bookService.findBook(bookId);
	if (book == null) {
	throw new ResourceNotFoundException();
	}
	model.addAttribute("book", book);
	}
	return "book-detail";
	}
	}

view raw BookController.java hosted with ❤ by GitHub

	@Controller
	@SessionAttributes(names = "cartBean")
	public class ResourceNotFoundController {
	@Controller
	@SessionAttributes(names = "cartBean")
	public class ResourceNotFoundController {
	@Autowired
	@Qualifier("cartBean")
	private Cart cartBean;
	@RequestMapping("/404")
	public String handleResourceNotFound(Model model, HttpServletRequest request) {
	HttpSession session = request.getSession(false);
	if (session == null) {
	model.addAttribute("cartBean", cartBean);
	}
	return "404page";
	}
	}

view raw ResourceNotFoundController.java hosted with ❤ by GitHub

	@ResponseStatus(HttpStatus.NOT_FOUND)
	public class ResourceNotFoundException extends RuntimeException {
	private static final long serialVersionUID = -3329819391367130855L;
	}

view raw ResourceNotFoundException.java hosted with ❤ by GitHub