http://vaporz.blog.51cto.com/3142258/706917
http://www.cnblogs.com/flyingchen/archive/2008/01/09/1032355.html
http://jiangwenfeng762.iteye.com/blog/1280700
http://iwin.iteye.com/blog/483327
http://lavasoft.blog.51cto.com/62575/237904
http://gcguchao8888-sina-com.iteye.com/blog/839021