自定义AnnotationFormatterFactory不起作用

import org.springframework.format.AnnotationFormatterFactory;
import org.springframework.format.Parser;
import org.springframework.format.Printer;

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

public class DateFormatterFactory implements AnnotationFormatterFactory<DateFormatter> {

    @Override
    public Class<?>[] getFieldTypes() {
        return new Class<?>[]{Date.class};
    }

    @Override
    public Printer<Date> getPrinter(DateFormatter annotation, Class<?> fieldType) {
        return new DateFormatterPrinter(annotation.value());
    }

    @Override
    public Parser<Date> getParser(DateFormatter annotation, Class<?> fieldType) {
        return new DateFormatterParser(annotation.value());
    }

    static class DateFormatterPrinter implements Printer<Date> {
        private final SimpleDateFormat dateFormat;

        public DateFormatterPrinter(String pattern) {
            this.dateFormat = new SimpleDateFormat(pattern);
        }

        @Override
        public String print(Date date, Locale locale) {
            return dateFormat.format(date);
        }
    }

    static class DateFormatterParser implements Parser<Date> {
        private final SimpleDateFormat dateFormat;

        public DateFormatterParser(String pattern) {
            this.dateFormat = new SimpleDateFormat(pattern);
        }

        @Override
        public Date parse(String text, Locale locale) throws ParseException {
            return dateFormat.parse(text);
        }
    }
}