java nio: Files.isWritable判断文件夹可写(创建子文件夹或文件)

Path path3=Paths.get("\\\\SERVER\\share");//匿名用户只有读取权限的共享文件夹
System.out.println(Files.isWritable(path3));//返回true

    /**
     * 判断一个文件夹是否可创建文件/文件夹及可删除
     * @param dir
     * @return
     */
    public static boolean isWritableDirectory(Path dir) {
        if (null == dir)
            throw new IllegalArgumentException("the argument 'dir' must not be null");
        if (!Files.isDirectory(dir))
            throw new IllegalArgumentException("the argument 'dir' must be a exist directory");
        try {
            Path tmpDir = Files.createTempDirectory(dir, null);
            Files.delete(tmpDir);
        } catch (IOException e) {
            return false;
        }
        try {
            Path tmpFile = Files.createTempFile(dir, null, null);
            Files.delete(tmpFile);
        } catch (IOException e) {
            return false;
        }
        return true;
    }