controller

第一種 modelandview 跳轉到jsp

public ModelAndView login(
        HttpServletRequest request) {
    //建立ModelAndView對象
    ModelAndView mv = new ModelAndView("error");
    System.out.println("login()");
    //獲取頁面請求參數
    String adminCode = request.getParameter("adminCode");
    String pwd = request.getParameter("pwd");
    System.out.println("adminCode:" + adminCode);
    System.out.println("pwd:" + pwd);
    if (us.FindAll(adminCode, pwd)) {
        System.out.print("成功");
        mv.setViewName("success");
        return mv;
    }
    if (adminCode == null || "".equals(adminCode)) {
        System.out.print("失敗");
    }
    List<User> list = us.finddatabase();
    mv.getModel().put("message", list);
    return mv;
}

第一種 string跳轉到jsp

 public String login(
            HttpServletRequest request) {


        System.out.println("login()");
        String adminCode =
                request.getParameter("adminCode");
        String pwd =
                request.getParameter("pwd");
        System.out.println("adminCode:"
                + adminCode);
        System.out.println("pwd:" + pwd);


        List<User> list = jdbc.getUserList();




            if(adminCode == null || "".equals(adminCode)) {
                System.out.print("失敗");
                return "error";
            }


            for(User ss:list){


                if(adminCode.trim().equals(ss.getName())) {


                    if(pwd.trim().equals(ss.getMima()+"")) {
                        System.out.print("成功");
                        return "index";
                    }