spring中泛型DAO的有关问题-Java教程-爱易网页

spring中泛型DAO的有关问题

日期：2014-05-20　浏览次数：20769 次

spring中泛型DAO的问题
首先我定义了GenericDao、GenericDaoImpl、GenericService、GenericServiceImpl，如下：
GenericDao:

Java code


public interface GenericDao<T> {
     
    public void save(T entity);
    
    public void remove(T entity);
    
    public void modify(T entity);
    
}

GenericDaoImpl:

Java code


public class GenericDaoImpl<T> implements
        GenericDao<T> {
    private Class<T> type;
    private HibernateTemplate hibernateTemplate;
    
    public GenericDaoImpl(Class<T> type) {
        this.type = type;    
    }
    public GenericDaoImpl(){}
    
    public void setHibernateTemplate(HibernateTemplate hibernateTemplate) {
        this.hibernateTemplate = hibernateTemplate;
    }    
    public HibernateTemplate getHibernateTemplate() {
        return hibernateTemplate;
    }    
    public void modify(T entity) {
        hibernateTemplate.update(entity);
    }
    public void remove(T entity) {
        hibernateTemplate.delete(entity);
    }    
    public void save(T entity) {
        hibernateTemplate.save(entity);
    }    
}

GenericService:

Java code


public interface GenericService<T> {

    public void save(T entity);

    public void remove(T entity);

    public void modify(T entity);
    
}

GenericServiceImpl:

Java code


public class GenericServiceImpl<T> implements
        GenericService<T> {
    private GenericDao<T> genericDao;

    public void modify(T entity) {
        genericDao.modify(entity);        
    }
    public void remove(T entity) {
        genericDao.remove(entity);
    }
    public void save(T entity) {        
        genericDao.save(entity);
    }
    public void setGenericDao(GenericDao<T> genericDao) {
        this.genericDao = genericDao;
    }        
}

然后我定义了UserDao、UserDaoImpl、UserService和UserServiceImpl，分别继承自它们，如下：
UserDao:

Java code


public interface UserDao extends GenericDao<User>{
    public User findByNameExact(String uname);
}

UserDaoImpl:

Java code


public class UserDaoImpl extends GenericDaoImpl<User> implements UserDao {

    public UserDaoImpl(){
        super(User.class);
    }

    public User findByNameExact(String uname) {System.out.println("aa");
        List<User> list = (List<User>) this.getHibernateTemplate().find(
                "from User where userName = '"+uname+"'");
        return (!list.isEmpty() && list.size() == 1) ? list.get(0) : null; 
    }
}

UserService:

Java code


public interface UserService extends GenericService<User>{
    public User exist(String userName);
}

UserServiceImpl:

Java code


public class UserServiceImpl  extends GenericServiceImpl<User> implements UserService{
    private UserDao userDao;
    
    public UserDao getUserDao() {
        return userDao;
    }

    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }

    public User exist(String userName) {
        // TODO Auto-generated method stub
        return userDao.findByNameExact(userName);
    }

}

此时我的spring配置文件应该怎么写才对？

------解决方案--------------------

XML code


<beans>
    <bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>
    
    <bean id="genericDao" abstract="true">
        <property name="hibernateTemplate" ref="hibernateTemplate" />
    </bean>
    
    <bean id="userDao" class="com.yourpackage.UserDaoImpl" parent="genericDao">
    </bean>
</beans>

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spring中泛型DAO的有关问题

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