我使用 hibernate 和 spring 创建了一个简单的 web 应用程序,我想实现一个包含 crud 操作的抽象类,但我有这个错误:
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'clientService' defined in class path resource [applicationContext.xml]:
Cannot resolve reference to bean 'clientDao' while setting bean property 'clientDao'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException:
Error creating bean with name 'clientDao' defined in class path resource [applicationContext.xml]:
Unsatisfied dependency expressed through constructor argument with index 0 of type [java.lang.Class]:
通用道
public interface GenericDao<T, ID extends Serializable> {
T save(T entity);
T update(T entity);
void delete(T entity);
T findById(ID id);
List<T> findAll();
void flush();
}
GenericDaoImpl
@Transactional
public class GenericDaoImpl<T, ID extends Serializable> implements GenericDao<T, ID> {
@Autowired
SessionFactory sessionFactory ;
private Class<T> persistentClass;
public GenericDaoImpl() {
super();
}
public GenericDaoImpl(Class<T> persistentClass) {
super();
this.persistentClass = persistentClass;
}
@Transactional
public T save(T entity) {
this.sessionFactory.getCurrentSession().save(entity);
return null;
}
@Transactional
public T update(T entity) {
this.sessionFactory.getCurrentSession().update(entity);
return null;
}
@Transactional
public void delete(T entity) {
this.sessionFactory.getCurrentSession().delete(entity);
}
@SuppressWarnings("unchecked")
@Transactional
public T findById(ID id) {
return (T) this.sessionFactory.getCurrentSession().load(this.getPersistentClass(), id);
}
@SuppressWarnings("unchecked")
@Transactional
public List<T> findAll() {
return this.sessionFactory.getCurrentSession().createQuery("* from"+this.getPersistentClass().getSimpleName()).list();
}
@Transactional
public void flush() {
this.sessionFactory.getCurrentSession().flush();
}
public SessionFactory getSessionFactory() {
return sessionFactory;
}
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
public Class<T> getPersistentClass() {
return persistentClass;
}
public void setPersistentClass(Class<T> persistentClass) {
this.persistentClass = persistentClass;
}
}
客户道
public interface ClientDao extends GenericDao<Client,Integer> {
}
ClientDaoImpl
@Transactional
@Repository("clientDao")
public class ClientDaoImpl extends GenericDaoImpl<Client,Integer> implements ClientDao {
public ClientDaoImpl(Class<Client> persistentClass) {
super(persistentClass);
}
应用程序上下文.xml
<bean id="client" class="com.webapp.model.Client"/>
<bean id="genericDao" class="com.webapp.dao.GenericDaoImpl">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<bean id="clientDao" class="com.webapp.dao.ClientDaoImpl" parent="genericDao">
<constructor-arg ref="client" />
</bean>
<bean id="clientService" class="com.webapp.service.ClientServiceImpl">
<property name="clientDao" ref="clientDao" />
</bean>