http://wenku.baidu.com/link?url=hJo82LAhILUcKEiKzpynlWy5ZGgke5v6v3BgScETx7N39VVPpWpgpC7RGQ4gzOEUbEQb4HgAYgpmA13EowcZZYfe1FyJVm82VAh5UhjIFZW上面的是文库 链接 现成的