获取 Maven 依赖关系图的 Java 代码

Question

我正在开发的程序的一个要求是，我需要能够查看存储库中多个工件的 Maven 依赖关系，以便为它们创建依赖关系图。虽然很明显 Maven 和 Eclipse Aether 可以做到这一点（因为 Maven 的很大一部分正在获得依赖项），但我很难弄清楚如何在 Java 程序中做到这一点。

有什么建议吗？

Answer 1

根据documentation 的说法，Aether 似乎可以提供帮助。甚至还有an example that demonstrates how to use Aether to collect the transitive dependencies of an artifact。结合Maven API example here，我认为你可以到达你想要的地方。

Answer 2

有几种方法可以实现这一点，或者使用 Eclipse 之类的 IDE...或者您可以使用 maven-dependency-plugin 直接打印到控制台...

mvn dependency:tree

Answer 3

在查看了各种不同的示例和代码后，我拼凑起来，这似乎可行：

public List<Artifact> fetchArtifactDependencies(final RepositorySystemSession session,
                                                final Artifact artifact,
                                                final DependencyFilter dependencyFilter)
        throws RepositoryException {

    final CollectRequest collectRequest = new CollectRequest();
    collectRequest.setRoot(new Dependency(artifact, "compile"));
    collectRequest.addRepository([repository]);

    final DependencyNode node = repositorySystem.collectDependencies(session, collectRequest)
                                                .getRoot();

    final DependencyRequest dependencyRequest = new DependencyRequest();
    dependencyRequest.setRoot(node);
    dependencyRequest.setFilter(dependencyFilter);

    final DependencyResult dependencyResult = repositorySystem.resolveDependencies(session,
                                                                                   dependencyRequest);

    final List<ArtifactResult> artifactResults = dependencyResult.getArtifactResults();

    final List<Artifact> results = new ArrayList<>(artifactResults.size());

    CollectionUtils.collect(artifactResults, new Transformer<ArtifactResult, Artifact>() {
        @Override
        public Artifact transform(final ArtifactResult input) {
            return input.getArtifact();
        }
    }, results);

    return results;
}