Java 8使用流java.io.UncheckedIOException读取文件 [英] Java 8 read file using streams java.io.UncheckedIOException

问题描述

我正在尝试使用流来读取文件，但我无法通过异常。我一直在环顾四周，但我无法理解为什么会被抛出。

I am trying to use streams to read a file but I cannot get past an exception. I have been looking around but I just can't understand why it's being thrown.

我要读的文件是 file.txt 并且它用UTF-8编码。

The file I am going to read is file.txt and it's encoded with UTF-8.

我正在使用 Files.lines（）：

String path = FileWordCount.class.getResource("file.txt").getPath().substring(1);

Files.lines(Paths.get(path), Charset.forName("UTF-8")).forEach(System.out::println);

尝试阅读文件时，我收到以下异常：

When trying to read the file I am getting the following exception:

Exception in thread "main" java.io.UncheckedIOException: java.nio.charset.MalformedInputException: Input length = 1
[...]
Caused by: java.nio.charset.MalformedInputException: Input length = 1

通常情况下，我不会发布有关例外的简单问题，但我只是想出这个问题。

Normally I don't post simple questions about exceptions but I just figure this one out.

推荐答案

UncheckedIOException 正在包装 MalformedInputException - 这是一个错误的错误。用于说明的JavaDoc：

The UncheckedIOException is wrapping a MalformedInputException - that is the unlying error. The JavaDoc for that says:

当给定字符集或输入的
输入字节序列不合法时，抛出检查异常字符序列不是合法的
十六位Unicode序列。

Checked exception thrown when an input byte sequence is not legal for given charset, or an input character sequence is not a legal sixteen-bit Unicode sequence.

所以你的 file.txt 不包含有效的UTF-8，导致UTF-8解码器报告错误。

So your file.txt does not contain valid UTF-8 and is causing the UTF-8 decoder to report an error.

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