PO可以严格对应数据库表，一张表对映一个PO。 BO则是业务逻辑处理对象，我的理解是它装满了业务逻辑的处理，在业务逻辑复杂的应用中有用。 VO：value object值对象、view object视图对象 PO：持久对象 QO：查询对象 DAO：数据访问对象——同时还有DAO模式 DTO：数据传输对象——同时还有DTO模式 -PO can be strictly correspond to database tables, a table mapping a PO. BO is the business logic to deal with the object, and I understand that it is filled with the handling of business logic in the application of complex business logic useful. VO: value object value object, view object view object PO: Persistent Object QO: Query Object DAO: Data Access Objects- DAO mode also DTO: Data Transfer Object- DTO model also