递归查询空文件，直查询空文件夹

    private static void recursion(String path){
        File file=new File(path);
        File[] files=   file.listFiles();
        if (files!=null) {
            for (int i = 0; i < files.length; i++) {
                if (files[i].isDirectory()) {
                    if (files[i].listFiles()==null) {
                        System.out.println(files[i].getAbsolutePath());
                    }           
                    recursion(files[i].getAbsolutePath());
                }
            }
        }
    }