Role : Decoupling
Main business logic: Function general use in a particular situation, reusability lower
transfer library hotel occupancy
CROSS business logic (system level services): Different primary operational some functions may be multiplexed
logging, processing services
Spring core
IoC: Inversion of Control: coupling solve the main business
core objects used in the program does not require programmers to new (), Spring container to create our core object
AOP: Oriented Programming: solving main service and cross traffic directly coupled
to a cross-section encapsulated into service, woven into the main business.
Filter-doFilter () - cross traffic
/ ADMIN / *
/ ADMIN / addBookServlet ---- main service
/ admin / showAllOdersServlet ---- main service
We need to use the jar package
Entry procedures required jar package
Four core package
beans.jar core.jar context.jar springexpression .jar
dependencies:
logging.jar the log4j.jar (does not display the log information may not be added) the junit.jar
