hibernate一对多例子
http://blog.163.com/lwh514@126/blog/static/6320629420087793240149/
http://blog.csdn.net/yuanfen860913/article/details/5656253
http://blog.sina.com.cn/s/blog_7210524f0100xjf4.html
http://www.blogjava.net/wujun/archive/2006/04/07/39700.html