spring data jpa如何使用自定义repository实现类

@Repository
@Transactional(readOnly = true)
public class MyRepositoryImpl<T,ID> extends SimpleJpaRepository<T, ID> {
 public MyRepositoryImpl(JpaEntityInformation<T, ID> entityInformation, EntityManager entityManager) {
        super(entityInformation, entityManager);
    }
    public MyRepositoryImpl(Class<T> domainClass, EntityManager em) {
        super(domainClass, em);
    }
    ...
}

public class MyJpaRepositoryFactoryBean<R extends Repository<T, ID>, T, ID>
        extends JpaRepositoryFactoryBean<R, T, ID> {
    public MyJpaRepositoryFactoryBean(Class<? extends R> repositoryInterface) {
        super(repositoryInterface);
    }
    @SuppressWarnings("rawtypes")
    protected RepositoryFactorySupport createRepositoryFactory(EntityManager em) {
        return new MyJpaRepositoryFactory(em);
    }
    private static class MyJpaRepositoryFactory<T, ID>
            extends JpaRepositoryFactory {
        private final EntityManager em;
        public MyJpaRepositoryFactory(EntityManager em) {
            super(em);
            this.em = em;
        }
        @Override
        protected JpaRepositoryImplementation<?, ?> getTargetRepository(RepositoryInformation information, EntityManager entityManager) {
            return new EntityJPARepositoryImpl<E>(
                    (Class<E>) information.getDomainType(), entityManager);
        }        
        protected Class<?> getRepositoryBaseClass(RepositoryMetadata metadata) {
            return MyRepositoryImpl.class;
        }
    }
}

@Configuration
@EnableJpaRepositories(basePackages = {...},
        repositoryFactoryBeanClass = MyJpaRepositoryFactoryBean.class)
public class JPAConfig {}

public interface PersonRepositoiry extends JpaRepository<Person, Integer> ,PersonDao{
public interface PersonDao { 
 void test(); 
} 
@Repository
public class PersonRepositoiryImpl implements PersonDao{ 
 @PersistenceContext
 private EntityManager em; 
 @Override
 public void test() {
  //只是用来测试
  Person person = em.find(Person.class, 1);
  System.out.println(person);
 } 
}

@Test
 public void testCustomerRepositoryMethod() {
  personRepositoiry.test();
 }