Spring Boot Generic DAO

Question

我在使用Spring Boot和Jersey构建的restful Web服务应用程序中实现了泛型dao层。我有一些相同的资源控制器，以避免重复相同的方法，我想创建一个GenericControllers或GenericResources控制器。在这些控制器中注入genericDao时遇到问题。对于这些通用资源，我不需要特定的服务。

public interface IGenericDAO<T extends Serializable> {
    T findOne(final Integer id);

    List<T> findAll();

    T create(final T entity);

    void update(final T entity);

    void delete(final T entity);

    void deleteById(final Integer id);
}

public abstract class AbstractGenericDAO<T extends Serializable> implements IGenericDAO<T> {

    private final Class<T> clazz;

    @SuppressWarnings("unchecked")
    public AbstractGenericDAO() {
        this.clazz = (Class<T>) ((ParameterizedType) this.getClass().getGenericSuperclass()).getActualTypeArguments()[0];
    }

    /**
     * getSession() from EntityManager which is already configured in spring-boot-starter-data-jpa. 
     * We inject EntityManager instead of SessionFactory
     */
    @Autowired
    private EntityManager entityManager;

    protected Session getCurrentSession() {
        return this.entityManager.unwrap(Session.class);
    }

    @Override
    public T findOne(Integer id) {
        // TODO Auto-generated method stub
        return (T) getCurrentSession().get(this.clazz, id);
    }

    @Override
    public List<T> findAll() {
        // TODO Auto-generated method stub
        CriteriaQuery<T> cq = getCurrentSession().getCriteriaBuilder().createQuery(this.clazz);
        cq.from(this.clazz);
        return getCurrentSession().createQuery(cq).getResultList();
    }

    @SuppressWarnings("unchecked")
    @Override
    public T create(T entity) {
        // TODO Auto-generated method stub
        return ((T) getCurrentSession().save(entity));
    }

    @Override
    public void update(T entity) {
        // TODO Auto-generated method stub
        getCurrentSession().saveOrUpdate(entity);
    }

    @Override
    public void delete(T entity) {
        // TODO Auto-generated method stub
        getCurrentSession().delete(entity);
    }

    @Override
    public void deleteById(Integer id) {
        // TODO Auto-generated method stub
        T entity = this.findOne(id);
        this.delete(entity);
    }
}

这是我的问题。我想在这里使用泛型资源：

public class GenericResource<T extends Serializable> extends AbstractGenericDAO<T> {


    /*@GET
    @Secured({"ROLE_ADMIN"})
    public Response list() {
        return Response.ok().entity(dao.findAll()).build();
    }*/
}