设计IBseDao接口，定义公共的CRUD方法。

 

// IBaseDao 接口，定义公共的CRUD方法public interface IBaseDao
        
          {        public void add(T t);    public void update(T t);    public void delete(T t);    public T getById(int id);    public List
         
           getList(int startIndex,int pageSize);    public int getTotalCount();}
         
        

// BaseDaoImpl接口，实现公共的CRUD方法public class BaseDaoImpl
        
          extends HibernateDaoSupport implements IBaseDao
         
           {    private Class
          
            entityClass;    // 子类的实例化需调用父类的无参构造方法，通过构造方法获取父类的泛型类型    public BaseDaoImpl() {        // this.getClass() --> 子类的class对象， getGenericSuperclass() ---> 获取父类的Type        ParameterizedType pType = (ParameterizedType) this.getClass().getGenericSuperclass();        // 获取第一个类型参数的真实类型，只有一个泛型参数，所以写0        // ParameterizedType 参数化类型， getActualTypeArguments()，返回表示此类型实际类型参数的Type对象的数组        entityClass = (Class
           
            ) pType.getActualTypeArguments()[0];    }    @Override    public void add(T t) { // 增加        this.getHibernateTemplate().save(t);    }    @Override    public void update(T t) {
      // 修改        this.getHibernateTemplate().update(t);    }    @Override    public void delete(T t) {
      // 删除        this.getHibernateTemplate().delete(t);    }    @Override    public T getById(int id) { // 查询单个对象        return this.getHibernateTemplate().get(entityClass, id);    }    @Override    public List
            
              getList(int startIndex, int pageSize) { // 分页查询        return this.getHibernateTemplate().execute(new HibernateCallback
             
              
               >() { @Override public List
               
                 doInHibernate(Session session) throws HibernateException { Query query = session.createQuery("from " + entityClass.getName()); query.setFirstResult(startIndex); query.setMaxResults(pageSize); return query.list(); } }); } @Override public int getTotalCount() { // 查询总记录数 return this.getHibernateTemplate().execute(new HibernateCallback
                
                 () { @Override public Integer doInHibernate(Session session) throws HibernateException { Query query = session.createQuery("select count(*) from " + entityClass.getName()); Long count = (Long) query.uniqueResult(); return count.intValue(); } }); }}
                
               
              
             
            
           
          
         
        

 

// IUserDao 继承 IBaseDao接口public interface IUserDao extends IBaseDao
        
          {}
        

 

// UserDaoImpl 继承BaseDaoImpl类，实现 IUserDao接口public class UserDaoImpl extends BaseDaoImpl
        
          implements IUserDao {    }
        

 

==========================================================================

Service层同理，设计IBseService接口，定义公共的CRUD方法。

 

// IBaseService接口，定义CRUD方法public interface IBaseService
        
          {    public void add(T t);    public void update(T t);    public void delete(T t);    public T getById(int id);    public List
         
           getList(int startIndex,int pageSize);    public Page
          
            getPage(String currentPage);}
          
         
        

 

// BaseServiceImpl类，实现IBaseService接口public abstract class BaseServiceImpl
        
          implements IBaseService
         
           {    //提供一个抽象方法，让子类返回对应的子类Dao    public abstract IBaseDao
          
            getBaseDao();    @Override    public void add(T t) {        getBaseDao().add(t);    }    @Override    public void update(T t) {        getBaseDao().update(t);    }    @Override    public void delete(T t) {        getBaseDao().delete(t);    }    @Override    public T getById(int id) {        return getBaseDao().getById(id);    }    @Override    public List
           
             getList(int startIndex, int pageSize) {        return getBaseDao().getList(startIndex, pageSize);    }    @Override    public Page
            
              getPage(String currentPage) {        Page
             
               page = new Page<>(1, 3); if(currentPage!=null){ page.setCurrentPage(Integer.parseInt(currentPage)); } int totalCount = getBaseDao().getTotalCount(); int totalPage = totalCount%page.getPageSize()==0?totalCount/page.getPageSize():totalCount/page.getPageSize()+1; List
              
                list = getList((page.getCurrentPage()-1)*page.getPageSize(),page.getPageSize()); page.setTotalPage(totalPage); page.setList(list); return page; }}
              
             
            
           
          
         
        

 

// IUserService 继承 IBaseService接口public interface IUserService extends IBaseService
        
          {}
        

 

// UserServiceImpl 继承 BaseServiceImpl类，实现IUserService 接口public class UserServiceImpl extends BaseServiceImpl
        
          implements IUserService {        private IUserDao userDao;    public IUserDao getUserDao() {        return userDao;    }    public void setUserDao(IUserDao userDao) {        this.userDao = userDao;    }    @Override    public IBaseDao
         
           getBaseDao() {        return userDao;    }}