Java class.getResourceAsStream()返回不正确的字节 [英] Java class.getResourceAsStream() returns incorrect byte

问题描述

getResourceAsStream()刚遇到一个非常奇怪的问题.

I have just run into a very strange problem with getResourceAsStream().

在产品项目JUnit测试中，我使用getResourceAsStream()读取测试数据，我发现getResourceAsStream()有时会替换某些字节:

In my prod project JUnit test I read test data using getResourceAsStream(), I found that getResourceAsStream() sometimes substitutes some bytes:

byte[] fileBytes = FileUtils.readFileToByteArray(new File(
    "resources/test/parser/test-short-enc.xml"));

printBytes(fileBytes);

byte[] classPathBytes = IOUtils.toByteArray(ParserTest.class
    .getResourceAsStream("/test/parser/test-short-enc.xml"))

printBytes(classPathBytes);

在此项目中，输出如下所示:

In this project output looks like this:

D0 9A D1 80 D0 B8 D0 BC D0 B8 D0 BD D0 B0 D0 BB D0 B8 D1 81 D1 82 D0 B8 D0 BA D0 B0

D0 9A D1 80 D0 B8 D0 BC D0 B8 D0 BD D0 B0 D0 BB D0 B8 D1 81 D1 82 D0 B8 D0 BA D0 B0

D0 9A D1 80 D0 B8 D0 BC D0 B8 D0 BD D0 B0 D0 BB D0 B8 D1 3F D1 82 D0 B8 D0 BA D0 B0

D0 9A D1 80 D0 B8 D0 BC D0 B8 D0 BD D0 B0 D0 BB D0 B8 D1 3F D1 82 D0 B8 D0 BA D0 B0

此后，我决定创建一个显示bug的小项目，并将其托管在Github上作为示例.这是链接: https://github.com/snowindy/getResourceAsStream-Bug

After this, I decided to create a small bug-showing project and host it at Github as an example. Here's the link: https://github.com/snowindy/getResourceAsStream-Bug

我基本上复制了所需的代码，运行后，我看不到问题重现:

I essentially copied the code needed, after run, I could not see the problem reproducing:

D0 9A D1 80 D0 B8 D0 BC D0 B8 D0 BD D0 B0 D0 BB D0 B8 D1 81 D1 82 D0 B8 D0 BA D0 B0

D0 9A D1 80 D0 B8 D0 BC D0 B8 D0 BD D0 B0 D0 BB D0 B8 D1 81 D1 82 D0 B8 D0 BA D0 B0

D0 9A D1 80 D0 B8 D0 BC D0 B8 D0 BD D0 B0 D0 BB D0 B8 D1 81 D1 82 D0 B8 D0 BA D0 B0

D0 9A D1 80 D0 B8 D0 BC D0 B8 D0 BD D0 B0 D0 BB D0 B8 D1 81 D1 82 D0 B8 D0 BA D0 B0

printBytes函数如下所示:

The printBytes function looks like this:

public static void printBytes(byte[] bv) {
    System.out.println();
    for (byte b : bv) {
        System.out.print(' ');
        System.out.print(String.format("%02X", b));
    }
}

那会是什么?

我使用eclipse，UTF-8工作区编码，该文件包含cyrilic单词Криминалистика"，这是UTF-8 no-BOM文件.

I use eclipse, UTF-8 workspace encoding, the file contains cyrilic word "Криминалистика", it's a UTF-8 no-BOM file.

我在两个项目中都使用JavaSE-1.6(jdk1.6.0_29)， 我有Windows 7操作系统，Windows-1252系统编码.

I use JavaSE-1.6 (jdk1.6.0_29) for both projects, I have Windows 7 OS, windows-1252 system encoding.

更新

我终于能够重现该错误.我更新了该项目，以便您可以对其进行测试: https://github.com/snowindy/getResourceAsStream-Bug

I was finally able to reproduce the bug. I updated the project so you can test it: https://github.com/snowindy/getResourceAsStream-Bug

仅当您在maven pom.xml中包含此代码时，该错误才会出现.这意味着它是特定于Maven的

The bug appears only if you have this code in maven pom.xml. This means it's maven-specific

<build>
    <sourceDirectory>src</sourceDirectory>
    <resources>
        <resource>
            <directory>resources</directory>
            <filtering>true</filtering>
        </resource>
    </resources>
...

推荐答案

好，我知道了.

此配置可解决问题:

<project>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
...

我从这个答案中得到启发: https://stackoverflow.com/a/8979120/792313

I got inspired with this answer: https://stackoverflow.com/a/8979120/792313

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