spring的几种事务配置
配置详解：http://www.html.org.cn/books/springReference/ch03s12.html
http://hi.baidu.com/iportal/blog/item/b6b7512cf598adeb8a1399d7.html
http://www.360doc.com/content/07/0207/10/10754_358715.shtml

参照网址：http://www.iteye.com/topic/615413