基于泛型实现的Spring注入问题？

为了更加明确，可能贴的代码有点长，请见谅。

这里主要是打算应用泛型来做一些通常基本的CRUD操作，但是注入的时候出了点点问题。

我把基类部分注释掉以后可以正常工作，但是有一个问题，我每个具体的action类又必须重写BaseAction中的方法，因为manager没有得到注入，这样失去了使用泛型的意义。我把注释去掉以后在BaseAction中的“manager”无法按期望的方式的初始化。因为manager中的属性“persistentClass”永远都是在manager bean配置时设置的值，而不能变化，泛型就是需要变，我期望的是manager中该属性根据BusinessFlowDAO的构造注入时的参数而改变，该怎么做呢？

 

附：我参考的一篇文章 http://blog.csdn.net/brodie/archive/2007/08/14/1743275.aspx

 

下边是我的代码：

1、接口genericDao.java

   

public interface GenericDAO {

	T findById(ID id, boolean lock);

	List findAll();
}

 

2、实现GenericHibernateDAO.java

 

public class GenericHibernateDAO extends
		HibernateDaoSupport implements GenericDAO {

	private Class persistentClass;

	public GenericHibernateDAO() {

	}
	public GenericHibernateDAO(Class persistentClass) {
		logger.debug("base class constructor " + persistentClass);
		this.persistentClass = persistentClass;
	}


	public Class getPersistentClass() {
		return persistentClass;
	}

	public void setPersistentClass(Class persistentClass) {
		this.persistentClass = persistentClass;
		logger.debug("persistentClass " + this.persistentClass);
	}

	@SuppressWarnings("unchecked")
	public T findById(ID id, boolean lock) {
		T entity;
		if (lock)
			// this.getHibernateTemplate().load(this.getPersistentClass(), id);
			entity = (T) getSession().get(getPersistentClass(), id,
					LockMode.UPGRADE);
		else
			entity = (T) getSession().get(getPersistentClass(), id);
		return entity;
	}

	@SuppressWarnings("unchecked")
	public List findAll() {
		return findByCriteria();
	}

3、service接口Manager.java

public interface Manager {

public T findById(ID id, boolean lock);

public List findAll();
}

 

4、service实现ManagerImpl.java

public class ManagerImpl implements Manager {
	protected final Logger logger = Logger.getLogger(ManagerImpl.class);

	private GenericDAO genericDAO;

	@SuppressWarnings("unchecked")
	public T findById(ID id, boolean lock) {
		return (T) this.genericDAO.findById(id, lock);
	}

	@SuppressWarnings("unchecked")
	public List findAll() {
		return (List) this.genericDAO.findAll();
	}
}

5、扩展的业务Dao、service

 

 

public interface BusinessFlowDAO extends GenericDAO{

	//TODO: add other method for business logic related to BusinessFlow
}

public class BusinessFlowDAOHibernate extends
		GenericHibernateDAO implements BusinessFlowDAO {
	public BusinessFlowDAOHibernate(Class persistentClass) {		
		super(persistentClass);
		logger.debug("child class constructor " + persistentClass);
	}
}

 

public interface BusinessFlowManager  extends Manager{	
}

 

public class BusinessFlowManagerImpl extends ManagerImpl
		implements BusinessFlowManager {
	private BusinessFlowDAO businessFlowDAO;

	public BusinessFlowDAO getBusinessFlowDAO() {
		return businessFlowDAO;
	}

	public void setBusinessFlowDAO(BusinessFlowDAO businessFlowDAO) {
		this.businessFlowDAO = businessFlowDAO;
		super.setGenericDAO(businessFlowDAO);
	}

}

 

baseAction如下：

public class BaseAction, TForm, ID extends Serializable>
		extends DispatchAction {
	protected org.apache.log4j.Logger logger = org.apache.log4j.Logger
			.getLogger("action");

	public T instance;

	public TForm tForm;

	protected Manager manager;

	@SuppressWarnings("unchecked")
	public ActionForward create(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		TForm tf = (TForm) form;
		try {
			instance = (T) ConvertUtil.convert(tf);
			this.manager.makePersistent(instance);
		} catch (Exception e) {
			e.printStackTrace();
			logger.debug("create object exception " + e.toString());
		}
		return null;
	}
......
}

6、配置注入的代码 applicationContext.xml

 

	
		
			com.wonders.persistence.config.BusinessFlow
		
		
			
		
	
	
		
			
		
	
。。。。。。