应该显式关闭BufferedReader和InputStreamReader吗？ [英] Should BufferedReader and InputStreamReader be closed explicitly?

问题描述

我想将 InputStream 的内容读入字符串：

private String readToString(InputStream stream) {
    return new BufferedReader(new InputStreamReader(stream))
            .lines().collect(Collectors.joining("\n"));
}

流来自 java.lang.Process 。

问题：我是否必须显式关闭任何 InputStream ，<$在这种情况下，c $ c> InputStreamReader 或 BufferedReader ？

Question: Do I have to explicitly close any of the InputStream, InputStreamReader or BufferedReader in this case?

旁注：链接问题是不重复，因为我的问题是 HOW 正确关闭流，而不是如何将流读取到字符串！

Sidenote: the linked question is NOT a duplicate, as my question is about HOW to properly close the streams, not how to read the stream to a String!

推荐答案

您只需要关闭外部包装器，但不要明确地这样做 - 那里是尝试使用资源，让您的生活更轻松：

You only need to close the outer wrapper, but don't do that explicitly either way - there is try-with-resource that will make your life easier:

public String readToString(InputStream stream) {

    try (InputStreamReader reader = new InputStreamReader(stream);
            BufferedReader br = new BufferedReader(reader)) {

        return br.lines().collect(Collectors.joining("\n"));

    } catch (IOException e) {
        e.printStackTrace();
        throw new RuntimeException(e);
    }
}

还有一个很多更简单的方法，更清晰：

There is also a much easier way to do that and way more clear:

Files.readAllLines(YourPath)

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