spring FieldRetrievingFactoryBean

Spring : 基于XML Schema的配置（一）:

 http://www.tuicool.com/articles/mMjY3uI

 http://www.cnblogs.com/jifeng/archive/2011/09/14/2176599.html

util:constant/元素

http://book.51cto.com/art/201004/193395.htm

http://wangqiaowqo.iteye.com/blog/1147376