Bind XMLGregorianCalendar field in Spring MVC with velocity

I have a model object with an XMLGregorianCalendar field. How can I bi开发者_如何学Pythonnd it to an input field?

For string fields I'm using:

#springFormInput("model.object.stringfield" "")

but can't work out the corresponding code for an XMLGregorianCalendar

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You may be better off converting the XMLGregorianCalendar to something easier to handle like Calendar or Date before handing it off to the presentation layer.

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Here's a solution. It uses jodatime but could probably be changed not to:

For the view (velocity in this case):

#springFormInput("model.object.xmlgregoriancalendar.field" "")

For the controller:

@InitBinder
public void binder(WebDataBinder binder) {
    binder.registerCustomEditor(XMLGregorianCalendar.class, new PropertyEditorSupport() {
       public void setAsText(String value) {
           setValue(createXMLGregorianCalendar(value));
        }

        public String getAsText() {
            return new SimpleDateFormat("dd/MM/yyyy").format(((XMLGregorianCalendar)getValue()).toGregorianCalendar().getTime());
        }  
    });
}

private XMLGregorianCalendar createXMLGregorianCalendar(String date) {
    LocalDateTime result = DateTimeFormat.forPattern("dd/MM/yyyy").parseDateTime(date).toLocalDateTime();
    return xmlDF().newXMLGregorianCalendar(result.toDateTime().toGregorianCalendar());
}


private static DatatypeFactory xmlDF() {
    try {
        return DatatypeFactory.newInstance();
    } catch (DatatypeConfigurationException ex) {
        throw new RuntimeException(ex);
    }
}