需要将系统A对fint的请求转化为系统B的请求。假设我有一个来自系统A的XML文档，如下所示:100Kathisiera200Bates300GavinKing1111HeadFirstJava1005555HeadFirstServlets2001111HibernateInAction300我必须将此请求放入系统B的请求结构中:100Kathisiera300GavinKing1111HeadFirstJava1001111HibernateInAction300200Bates5555HeadFirstServlets200首先，我必须根据bookOrderID将book分组到B