BOS系统开发笔记(2)----表现层的抽取和持久层的抽取

1、持久层：

BaseDao<T>接口：

public interface BaseDao<T> {
    public void save(T entity);
	public void delete(T entity);
	public void update(T entity);
	public T findById(Serializable id);
	public List<T> findAll();
}

BaseDao<T>接口的实现类BaseDaoImp<T>

public class BaseDaoImpl<T> extends HibernateDaoSupport implements IBaseDao<T> {
	//代表的是某个实体的类型
	private Class<T> entityClass;
	
	@Resource//根据类型注入spring工厂中的会话工厂对象sessionFactory
	public void setMySessionFactory(SessionFactory sessionFactory){
		super.setSessionFactory(sessionFactory);
	}
	
	//在父类（BaseDaoImpl）的构造方法中动态获得entityClass
	public BaseDaoImpl() {
		ParameterizedType superclass = (ParameterizedType) this.getClass().getGenericSuperclass();
		//获得父类上声明的泛型数组
		Type[] actualTypeArguments = superclass.getActualTypeArguments();
		entityClass = (Class<T>) actualTypeArguments[0];
	}
	
	public void save(T entity) {
		this.getHibernateTemplate().save(entity);
	}
	
	public void delete(T entity) {
		this.getHibernateTemplate().delete(entity);
	}
	
	public void update(T entity) {
		this.getHibernateTemplate().update(entity);
	}

    public T findById(Serializable id) {

    return this.getHibernateTemplate().get(entityClass, id);

    }

    public List<T> findAll() {

    String hql = "FROM " + entityClass.getSimpleName();

    return (List<T>) this.getHibernateTemplate().find(hql);

}    

2、表现层

BaseAction：

public class BaseAction<T> extends ActionSupport implements ModelDriven<T> {
	//模型对象
	private T model;
	public T getModel() {
		return model;
	}
	
	//在构造方法中动态获取实体类型，通过反射创建model对象
	public BaseAction() {
		ParameterizedType genericSuperclass = (ParameterizedType) this.getClass().getGenericSuperclass();
		//获得BaseAction上声明的泛型数组
		Type[] actualTypeArguments = genericSuperclass.getActualTypeArguments();
		Class<T> entityClass = (Class<T>) actualTypeArguments[0];
		//通过反射创建对象
		try {
			model = entityClass.newInstance();
		} catch (InstantiationException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		}
	}
}