实现循环复制文件夹下所有文件到指定的路径下，而且需要能修改目录结构，例如classes换成src.不能复制指定的文件或者目录下所有的文件-Copy down the path to achieve the cycle all the files to the folder specified, and the need to modify the directory structure, such as classes changed src. Not copy all the files in