面向切面——Spring提供了面向切面编程的丰富支持，允许通过分离应用的业务逻辑与系统级服务（例如审计（auditing）和事务（transaction）管理）进行内聚性的开发-Aspect Oriented- Spring provides rich support for aspect-oriented programming, cohesion development allowed by the separation of application business logic and s