Method modify

ch4/BoardController3.java:21–38

(BoardDto boardDto, SearchCondition sc, RedirectAttributes rattr, Model m, HttpSession session)

    BoardService boardService;

    @PostMapping("/modify")
    public String modify(BoardDto boardDto, SearchCondition sc, RedirectAttributes rattr, Model m, HttpSession session) {
        String writer = (String)session.getAttribute("id");
        boardDto.setWriter(writer);

        try {
            if (boardService.modify(boardDto)!= 1)
                throw new Exception("Modify failed.");

            rattr.addFlashAttribute("msg", "MOD_OK");
            return "redirect:/board/list"+sc.getQueryString();
        } catch (Exception e) {
            e.printStackTrace();
            m.addAttribute(boardDto);
            m.addAttribute("msg", "MOD_ERR");
            return "board";
        }
    }

    @GetMapping("/write")
    public String write(Model m) {