如何在Maven插件中进行文件复制？

Question

Now I'm writing a maven dependency A, and using this dependency in project B. The file structures of both are:

Dependency A:

Project B:

What I'm trying to do is when I run mvn spring-boot:run in Project B, the test.txt in A's src/main/resources/files will be copied into /WebContent in Project B.

What I have tried is writing following code in Dependency A:

        final File test = new File("files/test.txt");
        final File dest = new File("WebContent");
        try {
            FileUtils.copyFileToDirectory(test, dest);
        } catch (final IOException e) {
            e.printStackTrace();
        }

But When I do mvn spring-boot:run it said the file doesn't exist.

Answer 1

Though I wouldn't suggest copying from one project to another. Resources even if are same in two projects should be present in each as their own resource to keep it intact. Also, considering that you are looking for a solution with maven to do so.

Multi-module maven projects can have resources bundled at a common place using the remote resource plugin -

<plugin>
    <artifactId>maven-remote-resources-plugin</artifactId>
    <version>1.5</version>
    <executions>
      <execution>
        <goals>
          <goal>bundle</goal>
        </goals>
      </execution>
    </executions>
    <configuration>
      <includes>
        <include>**/*.ddl</include>
        <include>**/*.sql</include>
      </includes>
    </configuration>
</plugin>

Source - Maven Remote Resources

---

To copy a resource within a module or to a target directory which are not a part of default layout or in build/resources, you can also use Maven Resources Plugin as

<plugin>
    <artifactId>maven-resources-plugin</artifactId>
    <version>3.0.2</version>
    <executions>
      <execution>
        <id>copy-resources</id>
        <!-- here the phase you need -->
        <phase>validate</phase>
        <goals>
          <goal>copy-resources</goal>
        </goals>
        <configuration>
          <outputDirectory>${basedir}/target/extra-resources</outputDirectory>
          <resources>          
            <resource>
              <directory>src/non-packaged-resources</directory>
              <filtering>true</filtering>
            </resource>
          </resources>              
        </configuration>            
      </execution>
    </executions>
</plugin>