从API 查询知道，NIO的这种方式原生支持LINUX和UNIX低层系统
一下事修改linux文件权限位777，如需修改位644、755登其它权限，可通过调整perms.add（）的参数。
private void changeFolderPermission(File dirFile) throws IOException {
Set<PosixFilePermission> perms = new HashSet<PosixFilePermission>();
perms.add(PosixFilePermission.OWNER_READ);
perms.add(PosixFilePermission.OWNER_WRITE);
perms.add(PosixFilePermission.OWNER_EXECUTE);
perms.add(PosixFilePermission.GROUP_READ);
perms.add(PosixFilePermission.GROUP_WRITE);
perms.add(PosixFilePermission.GROUP_EXECUTE);
perms.add(PosixFilePermission.OTHERS_EXECUTE);
perms.add(PosixFilePermission.OTHERS_READ);
perms.add(PosixFilePermission.OTHERS_WRITE);
try {
Path path = Paths.get(dirFile.getAbsolutePath());
Files.setPosixFilePermissions(path, perms);
} catch (Exception e) {
logger.log(Level.SEVERE, "Change folder " + dirFile.getAbsolutePath() + " permission failed.", e);
}
}
