Web層

//表現層通用實現
public class BaseAction<T> extends ActionSupport implements ModelDriven<T> {
	
	protected PageBean pageBean = new PageBean();
	
	//建立離線提交查詢物件
	DetachedCriteria detachedCriteria = null;
	
	public void setPage(int page) {
		pageBean.setCurrentPage(page);
	}

	public void setRows(int rows) {
		pageBean.setPageSize(rows);
	}
	
	//將指定java物件轉為json,並響應到客戶端頁面
	public void java2Json(Object o,String[] excludes){
		JsonConfig jsonConfig = new JsonConfig();
		//指定哪些屬性不需要轉json
		jsonConfig.setExcludes(excludes);
		String json = JSONObject.fromObject(o,jsonConfig).toString();
		ServletActionContext.getResponse().setContentType("text/json;charset=UTF-8");
		try {
			ServletActionContext.getResponse().getWriter().print(json);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	//將指定java物件轉為json,並響應到客戶端頁面
	public void java2Json(List o,String[] excludes){
		JsonConfig jsonConfig = new JsonConfig();
		//指定哪些屬性不需要轉json
		jsonConfig.setExcludes(excludes);
		String json = JSONArray.fromObject(o,jsonConfig).toString();
		ServletActionContext.getResponse().setContentType("text/json;charset=UTF-8");
		try {
			ServletActionContext.getResponse().getWriter().print(json);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	public static final String HOME = "home";
	public static final String LIST = "list";
	
	//模型物件
	protected T model;

	public T getModel() {
		return model;
	}

	//在構造方法中動態獲取實體型別,通過反射建立model物件
	public BaseAction() {
		ParameterizedType genericSuperclass = (ParameterizedType) this.getClass().getGenericSuperclass();
		//獲得BaseAction上宣告的泛型陣列
		Type[] actualTypeArguments = genericSuperclass.getActualTypeArguments();
		Class<T> entityClass = (Class<T>) actualTypeArguments[0];
		detachedCriteria = DetachedCriteria.forClass(entityClass);
		pageBean.setDetachedCriteria(detachedCriteria);
		try {
			model = entityClass.newInstance();
		} catch (InstantiationException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		}
	}
	
}
 

Dao層

重點
1.獲得父類泛型的型別
2.將sessionFactory注入dao，給HibernateDaoSupport呼叫，生成HibernateTemplate

//持久層通用實現
public class BaseDaoImpl<T> extends HibernateDaoSupport implements IBaseDao<T> {

	//代表某個實體的型別
	private Class<T> entityClass;
	
	@Resource//根據型別注入spring工廠中的sessionFactory物件
	public void setMySessionFactory(SessionFactory sessionFactory){
		super.setSessionFactory(sessionFactory);
	}
	
	//在父類BaseDaoImpl的構造方法中動態獲得entityClass
	public BaseDaoImpl() {
		ParameterizedType superclass = (ParameterizedType) this.getClass().getGenericSuperclass();
		//獲得父類上宣告的泛型陣列
		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);
	}
}