Introduction - If you have any usage issues, please Google them yourself
In the classical architecture of J2EE on the basis of four increase in data persistence layer, proposed five-story based on J2EE Web development framework architecture of Struts framework based on J2EE architecture to achieve the limitations of object persistence, object isolated from persistence layer, and the object-oriented lightweight Hibernate object persistence technology integration into the architecture application logic layer and the DAO design pattern in the persistence layer design between the multi-source data access components, the abstract and encapsulate different data sources on the data access operations, to achieve different types, structure, environment, usage, uniform access to heterogeneous databases.