求思路，求代码，求参考
------解决方案--------------------
http://zhidao.baidu.com/question/180443662.html&__bd_tkn__=6ba354252a3599341151e73fbcba66ac920cd8f48078338d51fed8133ea5c69d362ad36bb4bcda3b39bb3949f6bbe47087ac3af56e60b1f4e7eb60157954fd369964affe5c0f03de0125277da644b10b38739d04792ac38da138367a02213028bc6f7e4041b1adabef0d8eaccbdc8d02c3302af44fa0
看看这个