1, J2EE application system and J2EE container
The J2EE application is only available in the J2EE container to run, and the J2EE container separates some general features of the general application system, such as transaction mechanism, security mechanism, and thread pool and other performance optimization mechanisms. Developed by professionals, saving procedures development has also improved the stability of the system to be guaranteed. Formally a special J2EE container server product, such as JBoss, WebSphere, WebLogic, and more.
2, (Separation of Concerns) Disperse Follow
3, AOP
AOP (Aspect Oriented Programming), it is OOP continuation, meaning aspect programming. AOP is actually a continuation of the GOF design mode. The GOF design pattern pursues the decoupling between the caller and the caller, and AOP can be said to be an implementation of this goal.
4, AOP application range
Authentication permissions
Caching cache
Context passing content
Error Handling error handling
Lazy loading lazy loading
Debugging debugging
Logging, Tracing, Profiling and Monitoring record tracking optimization calibration
Performance Optimization Performance Optimization
Persistence persistence
Resource pooling resource pool
Synchronization synchronization
Transactions transaction
