随笔：用spring之前对IOC的体会

Asking for differences between IoC and AOP is kind of like asking the difference between apples and oranges.

Aspect-Oriented Programming (AOP) is concerned mainly with abstracting functionality that applies across the board to many components of your application. For example, logging and security. These have little or nothing to do with the actual business functionality but are essential system-wide functions nonetheless.

Inversion of Control (IoC), a.k.a. Dependency Injection (DI) is concerned with maintaining loose coupling and managing the dependencies between the components of an application. 

Aspect-Oriented Programming (AOP) complements OOP by providing another way of thinking about program structure. While OO decomposes applications into a hierarchy of objects, AOP decomposes programs into aspects or concerns. This enables modularization of concerns such as transaction management that would otherwise cut across multiple objects. (Such concerns are often termed crosscutting concerns.)