JAVA項目之註冊

public class RegisterServlet extends HttpServlet {
    private UsersService usersService = new UsersService();

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 解決request的中文亂碼
        request.setCharacterEncoding("UTF-8");
        // 獲取用戶輸入的驗證碼
        String checkcode = request.getParameter("checkCode");
        // 獲取Session中的驗證碼
        String code = (String) request.getSession().getAttribute("checkcode_session");
        // 進行比較判斷
        if (!checkcode.equals(code)) {        
            //System.out.println("驗證碼錯誤!");
            request.setAttribute("info", "驗證碼錯誤!");
            request.getRequestDispatcher("/register.jsp").forward(request, response);
            return;
        }

        // 獲取全部請求參數的MAP集合
        Map<String, String[]> map = request.getParameterMap();
        // 建立users對象
        Users users = new Users();
        // 用BeanUtils中的方法將map集合中的參數封裝到Users對象中 // 原理：根據map中的key 跟user對象中的屬性名一一映射
        try {
            BeanUtils.populate(users, map);
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        // 封裝uid(隨機產生36位不重複的id)
        users.setUid(UUID.randomUUID().toString());
        // 調Service方法
        System.out.println(users);
        usersService.register(users);
        // 成功後，重定向到登陸頁面
        response.sendRedirect(request.getContextPath() + "/login.jsp");
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }
}

private UsersDao usersDao=new UsersDao();
    //註冊
    public void register(Users users){
        try {
            usersDao.register(users);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

// 註冊
    public void register(Users users) throws SQLException {
        /*
         * Connection conn = JDBCUtils.getConn(); String sql =
         * "insert into users(uid,username,password,email,name,sex,birthday) values(?,?,?,?,?,?,?)"
         * ; PreparedStatement pst=conn.prepareStatement(sql); pst.setString(1,
         * users.getUid()); pst.setString(2, users.getUsername());
         * pst.setString(3, users.getPassword()); pst.setString(4,
         * users.getEmail()); pst.setString(5, users.getName());
         * pst.setString(6, users.getSex()); pst.setString(7,
         * users.getBirthday()); //執行sql pst.executeUpdate(); //釋放資源
         * JDBCUtils.close(conn, pst);
         */
        QueryRunner qr = new QueryRunner(MyDBUtils.getDataSource());
        String sql = "insert into users(uid,username,password,email,name,sex,birthday) values(?,?,?,?,?,?,?)";
        qr.update(sql, new Object[] { users.getUid(), users.getUsername(), users.getPassword(), users.getEmail(),
                users.getName(), users.getSex(), users.getBirthday() });

    }