Spring framework 2．5介绍(中)

Introduction About Spring Framework 2.5,2nd part

这是上期介绍Spring发展史文章的第二部分，对这个领域陌生的开发者，可以通过此文学习Spring，对于比较熟悉这个领域的人，也是一个温故知新的机会。

This is the 2nd part of article about the history of Spring.People who are not familiar with Spring can learn to develop with it.And it's also a good chance for those to review who have been using it in their daily development.