如何从资源文件夹加载文件? [英] How do I load a file from resource folder?

问题描述

我的项目具有以下结构:

My project has the following structure:

/src/main/java/
/src/main/resources/
/src/test/java/
/src/test/resources/

我在 /src/test/resources/test.csv 中有一个文件，我想从 /src/test/java/MyTest.java 中的单元测试加载文件

I have a file in /src/test/resources/test.csv and I want to load the file from a unit test in /src/test/java/MyTest.java

我有这个无效的代码.它抱怨没有这样的文件或目录".

I have this code which didn't work. It complains "No such file or directory".

BufferedReader br = new BufferedReader (new FileReader(test.csv))

我也试过这个

InputStream is = (InputStream) MyTest.class.getResourcesAsStream(test.csv))

这也不起作用.它返回 null.我正在使用 Maven 来构建我的项目.

This also doesn't work. It returns null. I am using Maven to build my project.

推荐答案

尝试下一个:

ClassLoader classloader = Thread.currentThread().getContextClassLoader();
InputStream is = classloader.getResourceAsStream("test.csv");

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如果以上都不行，各种项目都添加了以下类:ClassLoaderUtil¹(代码这里).²

以下是如何使用该类的一些示例:

Here are some examples of how that class is used:

src\main\java\com\company\test\YourCallingClass.java
src\main\java\com\opensymphony\xwork2\util\ClassLoaderUtil.java
src\main\resources\test.csv

// java.net.URL
URL url = ClassLoaderUtil.getResource("test.csv", YourCallingClass.class);
Path path = Paths.get(url.toURI());
List<String> lines = Files.readAllLines(path, StandardCharsets.UTF_8);

// java.io.InputStream
InputStream inputStream = ClassLoaderUtil.getResourceAsStream("test.csv", YourCallingClass.class);
InputStreamReader streamReader = new InputStreamReader(inputStream, StandardCharsets.UTF_8);
BufferedReader reader = new BufferedReader(streamReader);
for (String line; (line = reader.readLine()) != null;) {
    // Process line
}

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备注

1. 在 The Wayback Machine 中查看.
2. 也在 GitHub.

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