@Override
    public String print(PetType petType, Locale locale) {
        return petType.getName();
    }
Instructs Spring MVC on how to parse and print elements of type 'PetType'. Starting from Spring 3.0, Formatters have
come as an improvement in comparison to legacy PropertyEditors. See the following links for more details: - The
Spring ref doc: http://static.springsource.org/spring/docs/current/spring-framework-reference/html/validation.html#format-Formatter-SPI
- A nice blog entry from Gordon Dickens: http://gordondickens.com/wordpress/2010/09/30/using-spring-3-0-custom-type-converter/
<p/>
Also see how the bean 'conversionService' has been declared inside /WEB-INF/mvc-core-config.xml

@author Mark Fisher
@author Juergen Hoeller
@author Michael Isvy
src/main/java/org/springframework/samples/petclinic/web/PetTypeFormatter.java