ClassLoader 规格严格 http://lzrzhao.iteye.com/blog/430012 http://jspengxue.iteye.com/blog/40567 http://bigdragon.iteye.com/blog/1635294 http://www.blogjava.net/zhuxing/archive/2008/07/24/217285.html http://blog.sina.com.cn/s/blog_62be49950100na4f.html http://blog.sina.com.cn/s/blog_56ae1d58010112td.html