参考一下
http://www.cnblogs.com/yqm/archive/2007/07/29/835385.htmlhttp://topic.csdn.net/u/20070317/19/c6405fa3-d80a-469c-9145-373e213954e6.html
http://www.cnblogs.com/yqm/archive/2007/07/29/835385.htmlhttp://topic.csdn.net/u/20070317/19/c6405fa3-d80a-469c-9145-373e213954e6.html
看 http://topic.csdn.net/u/20080529/17/699bf3e7-dbb2-4db5-ba51-fbf5924e9eb5.html