有没有办法在kotlin轻松打开和关闭流？

Question

我在java上要做的事情:

try(InputStream inputStream = new FileInputStream("/home/user/123.txt")) {

    byte[] bytes = new byte[inputStream.available()];
    inputStream.read(bytes);
    System.out.println(new String(bytes));


} catch (IOException e) {
    e.printStackTrace();
} 

但kotlin不知道try-with-resources!所以我的代码是

try {
    val input = FileInputStream("/home/user/123.txt")
} finally {
    // but finally scope doesn't see the scope of try!
}

有没有简单的方法来关闭流？我不会只谈论文件.有没有办法stream轻松关闭？

Answer 1

Closeable.use 正是你要找的:

val result = FileInputStream("/home/user/123.txt").use { input ->
    //Transform input to X
}