java-以太,如何获得层次结构的依赖关系

2019-11-19 05:04:06 阅读：127 来源： 互联网

我正在用eather在我的代码中重新创建mavendependency：tree的相同结构.
根据文档,我发现这个有用的example可以正确列出与插件相同的依赖关系,但是缺少任何“树”信息,这只是一个简单的列表.

 public static void main( String[] args )
    throws Exception
{
    System.out.println( "------------------------------------------------------------" );
    System.out.println( ResolveTransitiveDependencies.class.getSimpleName() );

    RepositorySystem system = Booter.newRepositorySystem();

    RepositorySystemSession session = Booter.newRepositorySystemSession( system );

    Artifact artifact = new DefaultArtifact( "org.eclipse.aether:aether-impl:1.0.0.v20140518" );

    DependencyFilter classpathFlter = DependencyFilterUtils.classpathFilter( JavaScopes.COMPILE );

    CollectRequest collectRequest = new CollectRequest();
    collectRequest.setRoot( new Dependency( artifact, JavaScopes.COMPILE ) );
    collectRequest.setRepositories( Booter.newRepositories( system, session ) );

    DependencyRequest dependencyRequest = new DependencyRequest( collectRequest, classpathFlter );

    List<ArtifactResult> artifactResults =
        system.resolveDependencies( session, dependencyRequest ).getArtifactResults();

    for ( ArtifactResult artifactResult : artifactResults )
    {
        System.out.println( artifactResult.getArtifact() + " resolved to " + artifactResult.getArtifact().getFile() );
    }
}

然后,我编写了另一段代码来检索非传递性依赖关系,并递归调用它,能够获得完整的依赖关系图,但没有任何限制,因此我应该实现一些过滤/限制例程.

由于我想在不引入“我的”过滤的情况下尽可能保持相同的插件逻辑,是否有任何方法可以适应第一个示例以检索层次结构信息？

解决方法:

如果您想要与插件实现的行为完全相同,我建议您研究一下插件的源代码here,这样您就不会错过任何细微差别.但是基本方法是使用collectRequest来collectDependencies,如下所示：

public static void main(String[] args) throws Exception {
    System.out.println("------------------------------------------------------------");

    RepositorySystem system = Booter.newRepositorySystem();

    RepositorySystemSession session = Booter.newRepositorySystemSession(system);

    Artifact artifact = new DefaultArtifact("org.apache.maven.plugins:maven-shade-plugin:2.3");

    DependencyFilter classpathFlter = DependencyFilterUtils.classpathFilter(JavaScopes.COMPILE);

    CollectRequest collectRequest = new CollectRequest();
    collectRequest.setRoot(new Dependency(artifact, JavaScopes.COMPILE));
    collectRequest.setRepositories(Booter.newRepositories(system, session));

    DependencyRequest dependencyRequest = new DependencyRequest(collectRequest, classpathFlter);

    List<ArtifactResult> artifactResults =
            system.resolveDependencies(session, dependencyRequest).getArtifactResults();

//        for (ArtifactResult artifactResult : artifactResults) {
//            System.out.println(artifactResult.getArtifact() + " resolved to " + artifactResult.getArtifact().getFile());
//        }

    //use collectDependencies to collect
    CollectResult collectResult = system.collectDependencies(session, collectRequest);
    DependencyNode node = collectResult.getRoot();
    node.accept(new TreeDependencyVisitor(new DependencyVisitor() {
        String indent = "";
        @Override
        public boolean visitEnter(DependencyNode dependencyNode) {
            System.out.println(indent + dependencyNode.getArtifact());
            indent += "    ";
            return true;
        }

        @Override
        public boolean visitLeave(DependencyNode dependencyNode) {
            indent = indent.substring(0, indent.length() - 4);
            return true;
        }
    }));

}

[编辑：]
要包括测试依赖项,您将需要自定义会话的depSelector,如下所示：

    DependencySelector depFilter =
            new AndDependencySelector(
                    new ScopeDependencySelector( "provided" ),
                    new OptionalDependencySelector(),
                    new ExclusionDependencySelector()
            );

并添加classpathFilter进行遍历：

DependencyFilter classpathFlter = DependencyFilterUtils.classpathFilter(JavaScopes.TEST);

node.accept(new TreeDependencyVisitor(new FilteringDependencyVisitor(new DependencyVisitor() {
    ...
}, classpathFlter)));

不过,这将不完全与dependency：tree相同,因为它实际上将列出所有要测试类路径的罐子.但是实际上,您可以进一步自定义NodeVisitor以过滤所需的内容.

标签：maven,java,aether
来源： https://codeday.me/bug/20191119/2033502.html

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java-以太,如何获得层次结构的依赖关系