RangeValidator中的日期格式

import java.text.SimpleDateFormat;
import java.util.Date;

import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.validator.ValidatorException;

import org.apache.myfaces.custom.validator.RangeValidator;

public class DateRangeValidator extends RangeValidator {

    private String dateFormat;

    public void setDateFormat(String dateFormat) {
        this.dateFormat = dateFormat;
    }

    public String getDateFormat() {
        return dateFormat;
    }

    @Override
    public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
        SimpleDateFormat sdf = new SimpleDateFormat(dateFormat);
        try {
            Date date = sdf.parse((String) value);
            super.validate(context, component, date);
        } catch (Exception e) {
            throw new ValidatorException(new FacesMessage("Invalid date format. Expected format is " + dateFormat));
        }
    }
}