public class DateAdapterForDay extends XmlAdapter<String, Date> {

    private SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");  

    @Override

    public String marshal(Date v) throws Exception {

        if (null == v) {

            return null;

        }

        return dateFormat.format(v);

    }  

    @Override

    public Date unmarshal(String v) throws Exception {

        if (!StringUtil.isNotBlank(v)) {

            return null;

        }

        return dateFormat.parse(v);

    }  

}