推荐回答（1个）
Spring是一个轻量级控制反转（IOC）和面向切面（AOP）的容器框架，
它主要是为了解决企业应用开发的复杂性而诞生的：
目的：解决企业级应用开发的复杂性。
功能：使用基本的JavaBean代替EJB。
范围：任何Java应用。
Spring的存在是因为它自身的得天独厚的优势：
它定位的领域是许多其他流行的framework没有的。
Spring是全面的和模块化的。
它的设计从底部帮助你编写易于测试的代码。
Spring是潜在一站式解决方案。
Spring天生就存在如下的有点：
低侵入式设计，代码污染极低。
Write Once,Run Anywhere
DI有效的降低了耦合度。
AOP提供了通用的任务的集中管理。
ORM和DAO简化了对数据库的访问。
高度开放性，并不强制（贯穿于变现层，业务层，持久层）
Spring的优点给开发带来的好处：
可以有效组织中间层对象。
使用同一的配置文件。
促进良好的编程习惯，减少编程代价。
易于单元测试。（一Spring基本组就是JavaBean,二提供了对Juit的支持）
使EJB成为一种备选。
为数据存取提供了一致性的框架。
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