Java 无法使用 Maven 访问资源目录中的文件（使用 Eclipse IDE）
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Can't access to files in resources directory with Maven (with Eclipse IDE)
提问by Iraes
I have a problem for a couple of hours, and I tried all the solutions I've found on tutorials.
It's simple: I can't access the resource files. I try to open a file I've put in src/main/resourcesand src/test/resources.
我遇到了几个小时的问题，我尝试了在教程中找到的所有解决方案。很简单：我无法访问资源文件。我尝试打开一个我已经放入的文件src/main/resources和src/test/resources.
I have a simple Java project and I use Maven, with Eclipse as IDE, with the m2e plugin.
I want to use resources filtering with Maven, with different profiles, and there's my POM.xml:
我有一个简单的 Java 项目，我使用 Maven，将 Eclipse 作为 IDE，使用 m2e 插件。我想在 Maven 中使用资源过滤，使用不同的配置文件，这是我的POM.xml：
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.5</source>
<target>1.5</target>
<debug>false</debug>
<optimize>true</optimize>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>2.4</version>
<configuration>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
</plugins>
<filters>
<filter>src/main/filters/${env}.properties</filter>
</filters>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
<resource>
<directory>src/test/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
</build>
<profiles>
<profile>
<id>LOCAL</id>
<activation>
<activeByDefault>true</activeByDefault>
</activation>
<properties>
<env>local</env>
</properties>
</profile>
</profiles>
And I made a simple test, in src/java/test :
我在 src/java/test 中做了一个简单的测试：
@Test
public void testOpenResourceFile() {
File testf=new File("/test.txt");
assertTrue(testf.exists());
}
So, in Eclipse, I run (on my project folder, in the package view) :
因此，在 Eclipse 中，我运行（在我的项目文件夹中，在包视图中）：
- Run as > Maven build > process-resources
- Run as > Maven build > process-test-ressources
- Run as > Maven build > compile
- 运行方式 > Maven 构建 > 流程资源
- 运行方式 > Maven build > process-test-ressources
- 运行方式 > Maven 构建 > 编译
With env: LOCAL
使用环境：本地
In the test, I do: Run as > Junit Test Case. But it fail... I looked in target/test-classes directory generated by Maven, and the file test.txt is there.
在测试中，我这样做：Run as > Junit Test Case。但它失败了......我查看了Maven生成的target/test-classes目录，文件test.txt在那里。
Did I missed some steps during my project's compilation, or is there a problem with my configuration?
我在项目编译过程中是否遗漏了一些步骤，或者我的配置有问题？
EDIT:
I tried with File("test.txt")and File("../test.txt")as well.
编辑：
我试着用File("test.txt")和File("../test.txt")为好。
采纳答案by Sam Hanes
It looks to me like your problem is
在我看来你的问题是
File testf = new File( "/test.txt" );
That's looking for a file called test.txtat the root of your computer's filesystem. What you want is the root of the resource tree, which you get with the getResourcemethod:
那是在寻找一个test.txt在你的计算机文件系统的根目录下调用的文件。您想要的是资源树的根，您可以通过以下getResource方法获得：
File testf = new File( this.getClass().getResource( "/test.txt" ).toURI() );
Or, in static context, use the name of the containing class:
或者，在静态上下文中，使用包含类的名称：
File testf = new File( MyClass.class.getResource( "/test.txt" ).toURI() );
Of course you'll need to add error handling to that example.
当然，您需要为该示例添加错误处理。
回答by Marco
I had the same problem, just make sure that the "text.txt" file is in the resources folder of the test project (src/test/resources/text.txt) and not in any other resources folder. Also, you should retrieve the file from the resources folder like this:
我遇到了同样的问题，只需确保“text.txt”文件位于测试项目的资源文件夹（src/test/resources/text.txt）中，而不是在任何其他资源文件夹中。此外，您应该像这样从资源文件夹中检索文件：
this.getClass().getClassLoader().getResource("text.txt").getFile();
If this still does not work then try to set the useSystemClassLoaderfrom the maven-surefire-pluginto false in your pom.xml.
如果仍然不工作，然后尝试设置useSystemClassLoader从maven-surefire-plugin假你pom.xml。
http://maven.apache.org/surefire/maven-surefire-plugin/examples/class-loading.html
http://maven.apache.org/surefire/maven-surefire-plugin/examples/class-loading.html
回答by Abhimanyu Shekhawat
I made this method for this job:
我为这项工作制定了这种方法：
public static String getPropaccess(String key){
String value="";
Properties configFile = new Properties();
try {
configFile.load(Propaccess.class.getClassLoader().getResourceAsStream("test/resources/config.properties"));
value = configFile.getProperty(key);
return value;
} catch (IOException e) {
e.printStackTrace();
}
return value;
}
回答by Vandit Upadhyay
Check your <build>tag in pom.xml it should be something like this, faced the same issue and adding this <resources>tag in the <build>worked for me.
检查你<build>在 pom.xml 中的标签，它应该是这样的，面临同样的问题，并在为我工作的时候添加这个<resources>标签<build>。
<build>
<resources>
<resource>
<filtering>true</filtering>
<directory>src/main/resources</directory>
</resource>
</resources>
</build>
