项目笔记(ssh)

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1.Dao层抽取

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(1)BaseDaoImpl<T>-->BaseDao<T>
   UserDaoImpl<User>-->UserDao<User>
(2)UserDao<User> extends BaseDao<T>
   UserDaoImpl<User> extends BaseDaoImpl<T>

2.Action层抽取

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(1)BaseAction<T> extends ActionSupport implements ModelDriven<T>
(2)UserAction<User> extends BaseAction<T>

3.通过反射创建对象

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//在构造方法中动态获取实体类，通过反射创建model对象
//泛型指定user时，this为user，通过反射创建user对象赋值给model
	public BaseAction() throws InstantiationException, IllegalAccessException {
		//获取父类class属性
		ParameterizedType genericsSuperclass = (ParameterizedType) this.getClass().getGenericSuperclass();
		//获取泛型数组
		Type[] actualTypeArguments = genericsSuperclass.getActualTypeArguments();
		Class<T> entityClass = (Class<T>)actualTypeArguments[0];
		//通过反射创建对象
		model = entityClass.newInstance();
    }