How do I load a file from resource folder?

Question

My project has the following structure:

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

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

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

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

I also tried this

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

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

Answer 1

Try the next:

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

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If the above doesn't work, various projects have been added the following class: ClassLoaderUtil¹ (code here).²

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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Notes

1. See it in The Wayback Machine.
2. Also in GitHub.

Answer 2

Try:

InputStream is = MyTest.class.getResourceAsStream("/test.csv"); 

IIRC getResourceAsStream() by default is relative to the class's package.

As @Terran noted, don't forget to add the / at the starting of the filename