在一般情况下，不能将资源文件夹中的文件用于测试。原因是资源文件夹中的资源文件存储在jar中。它们在文件系统中没有真正的路径。

最简单的解决方法是:

将文件从资源复制到临时文件夹，并获取该临时文件的路径。 使用临时路径执行测试。 删除临时文件。

来自JUnit的TemporaryFolder可以用来创建临时文件，并在测试完成后删除它。番石榴库中的类用于从资源文件夹中复制文件。

请注意，如果我们使用resources文件夹中的子文件夹，就像good文件夹一样，我们不必在资源路径中添加前导/。

public class SomeTest {

    @Rule
    public TemporaryFolder tmpFolder = new TemporaryFolder();


    @Test
    public void doSomethinge() throws IOException {
        File file = createTmpFileFromResource(tmpFolder, "file.txt");
        File goodFile = createTmpFileFromResource(tmpFolder, "good/file.txt");

        // do testing here
    }

    private static File createTmpFileFromResource(TemporaryFolder folder,
                                                  String classLoaderResource) throws IOException {
        URL resource = Resources.getResource(classLoaderResource);

        File tmpFile = folder.newFile();
        Resources.asByteSource(resource).copyTo(Files.asByteSink(tmpFile));
        return tmpFile;
    }

}

尝试使用ClassLoader类:

ClassLoader classLoader = getClass().getClassLoader();
File file = new File(classLoader.getResource("somefile").getFile());
System.out.println(file.getAbsolutePath());

ClassLoader负责装入类。每个类都有一个对ClassLoader的引用。这段代码从资源目录返回一个File。对其调用getAbsolutePath()将返回其绝对路径。

Javadoc for ClassLoader： http://docs.oracle.com/javase/7/docs/api/java/lang/ClassLoader.html

@Steve C和@ashosborne1提供的选项存在差异和限制。我想，它们必须具体说明。

File resourcesDirectory = new File("src/test/resources");?

1 When tests are going to be run via maven only but not via IDE. 2.1 When tests are going to be run via maven or 2.2 via IDE and only one project is imported into IDE. (I use “imported” term, cause it is used in IntelliJ IDEA. I think users of eclipse also import their maven project). This will work, cause working directory when you run tests via IDE is the same as your project. 3.1 When tests are going to be run via maven or 3.2 via IDE, and more than one projects are imported into IDE (when you are not a student, you usually import several projects), AND before you run tests via IDE, you manually configure working directory for your tests. That working directory should refer to your imported project that contains the tests. By default, working directory of all projects imported into IDE is only one. Probably it is a restriction of IntelliJ IDEA only, but I think all IDEs work like this. And this configuration that must be done manually, is not good at all. Working with several tests existing in different maven projects, but imported into one big “IDE” project, force us to remember this and don’t allow to relax and get pleasure from your work.

@ashosborne1提供的解决方案(我个人更喜欢这个)需要在运行测试之前完成2个额外的要求。下面是使用这个解决方案的步骤列表:

Create a test folder (“teva”) and file (“readme”) inside of “src/test/resources/”: src/test/resources/teva/readme File must be created in the test folder, otherwise, it will not work. Maven ignores empty folders. At least once build project via mvn clean install. It will run tests also. It may be enough to run only your test class/method via maven without building a whole project. As a result your test resources will be copied into test-classes, here is a path: target/test-classes/teva/readme After that, you can access the folder using code, already offered by @ashosborne1 (I'm sorry, that I could not edit this code inside of this list of items correctly):

TEVA_FOLDER = "teva";.．. URL tevaUrl = YourTest.class.getClassLoader().getResource(TEVA_FOLDER); 字符串tevaTestFolder = new File(tevaul . touri ()).getAbsolutePath();

现在您可以通过IDE运行您的测试，次数不限。直到你把mvn清理干净。它将删除目标文件夹。

在通过IDE运行测试之前，在测试文件夹中创建文件并首次运行maven是必需的步骤。如果没有这些步骤，如果您只是在IDE中创建测试资源，然后编写测试并仅通过IDE运行它，您将会得到一个错误。通过mvn运行测试会将测试资源复制到target/test-classes/teva/readme中，并且类加载器可以访问这些资源。

You may ask, why do I need import more than one maven project in IDE and why so many complicated things? For me, one of the main motivation: keeping IDA-related files far from code. I first create a new project in my IDE. It is a fake project, that is just a holder of IDE-related files. Then, I import already existing maven projects. I force these imported projects to keep IDEA files in my original fake project only. As a result I don't see IDE-related files among the code. SVN should not see them (don't offer to configure svn/git to ignore such files, please). Also it is just very convenient.

我使用的最简单和干净的解决方案，假设测试类的名称是TestQuery1，并且在您的测试文件夹中有一个资源目录，如下所示:

├── java
│   └── TestQuery1.java
└── resources
    └── TestQuery1
        ├── query.json
        └── query.rq

要获得TestQuery1的URI，请执行以下操作:

URL currentTestResourceFolder = getClass().getResource("/"+getClass().getSimpleName());

要获取文件TestQuery1的URI，请执行以下操作:

File exampleDir = new File(currentTestResourceFolder.toURI());
URI queryJSONFileURI = exampleDir.toURI().resolve("query.json");

如果这是一个spring项目，我们可以使用下面的代码从src/test/resource文件夹中获取文件。

File file = ResourceUtils.getFile(this.getClass().getResource("/some_file.txt"));

使用Spring，你可以很容易地从资源文件夹(main/resources或test/resources)中读取:

例如，创建一个文件test/resources/subfolder/sample.json

@Test
public void testReadFile() {
    String json = this.readFile("classpath:subfolder/sample.json");
    System.out.println(json);
}

public String readFile(String path) {
    try {
        File file = ResourceUtils.getFile(path);
        return new String(Files.readAllBytes(file.toPath()));
    } catch (IOException e) {
        e.printStackTrace();
    }

    return null;
}