在Kotlin尝试资源 [英] Try-with-resources in Kotlin

问题描述

当我尝试在Kotlin中编写等效的try-with-resources代码时，它对我不起作用。

When I tried to write an equivalent of try-with-resources code in Kotlin it didn't work for me.

我尝试了以下不同的变体：

I tried different variations of the following:

try (writer = OutputStreamWriter(r.getOutputStream())) {
    // ...
}

但不起作用。

有谁知道应该使用什么呢？
显然Kotlin语法没有这种结构的定义，但可能我错过了什么。它定义了try块的语法如下：

Does anyone know what should be used instead? Apparently Kotlin grammar doesn't have definition for such a construct, but may be I'm missing something. It defines grammar for try block as follows:

try : "try" block catchBlock* finallyBlock?;

推荐答案

使用 -function in kotlin stdlib（ src ）。

There is use-function in kotlin stdlib (src).

如何使用它：

OutputStreamWriter(r.getOutputStream()).use {
    // by `it` value you can get your OutputStreamWriter
    it.write('a')
}

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