spring notes

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nexus is a tool of warehouse management
first nexus search local warehous ,if not found ,go to internet

and automatically download the  components needed.

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Spring 

2 core concetp: IoC , AOP 

IoC: inversion of Control

AOP: ASPECT ORIENTED PRORGAMMING

 https://www.cnblogs.com/wmyskxz/p/8820371.html