Problem with ajax and servlet

I have a problem sending a date from the java servlet to a jsp to do it in real time

Servlet

       case "ConsultarxFecha":

// int IdPln = Integer.parseInt (request.getParameter ("typePlan"));                     VOPlan DateShip = new VOPlan ();                     String DateIni = request.getParameter ("SendDate");                     SimpleDateFormat fo = new SimpleDateFormat ("yyyy / MM / dd");                     Date dateIni = fo.parse (DateIni);                     Date date Sent = null;

                FechaEnvio.setFechaInicio(fechaIni);

// planEnv.setIdPlan_Type (IdPlan);                     ArrayList Show Date = new DAO.DAOPlan (). Show DatexPlan (DateShipped);

                for (int i = 0; i < MostrarFecha.size(); i++) {
                    VOPlan item = MostrarFecha.get(i);
                    fechaEnviada = item.getFechaInicio();
                }

                response.setContentType("aplication/json");
                response.setCharacterEncoding("UTF-8");
                response.getWriter().write(String.valueOf(fechaEnviada.toString()));
                break;

Ajax

<script>
    function cargarFecha()
    {
        $.ajax({
            type: 'post',
            dataType: 'json',
            data: {EnviarFecha: $("#FechaI").val(), Peticion: "ConsultarxFecha"},
            cache: false,
            url: '../SVLAfiliado',
            success: function (response, textStatus, jqXHR) {
                $("#FechaF").val(response);
            },
            error: function (jqXHR, textStatus, errorThrown) {
                alert('Error cargando los diagnosticos - ' + jqXHR.datos);
            }
        });
    }
</script>