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

问题描述

当我尝试在 Kotlin 中编写 Java try-with-resources 代码的等效代码时，它对我不起作用.

When I tried to write an equivalent of a Java 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())) {
    // ...
}

但两者都不起作用.

有谁知道应该用什么代替?显然 Kotlin 语法 没有定义这样的结构，但也许我错过了某物.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 maybe I'm missing something. It defines grammar for try block as follows:

try : "try" block catchBlock* finallyBlock?;

推荐答案

kotlin stdlib (src).

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

使用方法:

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

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