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() {
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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();
}
}
}