public interface BaseDao<T> {

    T get(String id);

}  

 import java.lang.reflect.ParameterizedType;

 import java.lang.reflect.Type;  

 public abstract class HibernateBaseDao<T> implements BaseDao<T> {

     private Class<T> entityClass;  

     /**

      * 这个通常也是hibernate的取得子类class的方法

      *

      * @author "yangk"

      * @date 2010-4-11 下午01:51:28

      */

     public HibernateBaseDao() {

         Type genType = getClass().getGenericSuperclass();

         Type[] params = ((ParameterizedType) genType).getActualTypeArguments();

         entityClass = (Class) params[0];

     }  

     @Override

     public T get(String id) {

         try {

             return entityClass.newInstance();

         } catch (InstantiationException e) {

             // TODO Auto-generated catch block

             e.printStackTrace();

         } catch (IllegalAccessException e) {

             // TODO Auto-generated catch block

             e.printStackTrace();

         }

         return null;

     }  

 }