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 bus

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In this article I am demonstrating a chat application which can handle multiple users at the same time. It also supports file transfer.

USART testing to check at command serially data transfer code