如何在Maven中获取依赖树而不下载被隔离的JAR包

Maven命令方式 #

因为被隔离的只是JAR包，POM仍可正常访问，所以可以通过让Maven仅解析POM来生成依赖树，跳过JAR下载步骤：

• 执行以下命令：

  mvn dependency:tree -Dmaven.dependency.get.jars=false -Dmaven.dependency.get.sources=false
  

  这两个参数会阻止Maven尝试下载JAR和源码文件，仅通过POM解析完整的依赖树，避免405错误中断流程。
• 若需要指定特定配置文件，可追加-s /path/to/settings.xml参数，确保Maven能正确访问内部Artifactory仓库（如有认证需求）。

Java代码方式 #

使用Apache Maven Resolver库手动解析POM并构建依赖树，该库支持单独处理POM解析，无需下载JAR：

1. 先添加必要依赖到你的项目POM：

   <dependency>
       <groupId>org.apache.maven.resolver</groupId>
       <artifactId>maven-resolver-api</artifactId>
       <version>1.9.15</version>
   </dependency>
   <dependency>
       <groupId>org.apache.maven.resolver</groupId>
       <artifactId>maven-resolver-impl</artifactId>
       <version>1.9.15</version>
   </dependency>
   <dependency>
       <groupId>org.apache.maven.resolver</groupId>
       <artifactId>maven-resolver-connector-basic</artifactId>
       <version>1.9.15</version>
   </dependency>
   <dependency>
       <groupId>org.apache.maven.resolver</groupId>
       <artifactId>maven-resolver-transport-http</artifactId>
       <version>1.9.15</version>
   </dependency>
   <dependency>
       <groupId>org.apache.maven</groupId>
       <artifactId>maven-model-builder</artifactId>
       <version>3.9.5</version>
   </dependency>
   

2. 编写解析代码：

   import org.apache.maven.model.Model;
   import org.apache.maven.model.building.DefaultModelBuilder;
   import org.apache.maven.model.building.DefaultModelBuilderFactory;
   import org.apache.maven.model.building.DefaultModelBuildingRequest;
   import org.apache.maven.model.building.ModelBuildingRequest;
   import org.apache.maven.resolver.examples.util.Booter;
   import org.apache.maven.resolver.internal.impl.DefaultRepositorySystem;
   import org.apache.maven.resolver.repository.RepositorySystem;
   import org.apache.maven.resolver.repository.RepositorySystemSession;
   import org.apache.maven.resolver.repository.remote.RemoteRepository;
   
   import java.io.File;
   import java.util.List;
   
   public class DependencyTreeParser {
       public static void main(String[] args) throws Exception {
           // 初始化仓库系统
           RepositorySystem repoSystem = Booter.newRepositorySystem();
           RepositorySystemSession session = Booter.newRepositorySystemSession(repoSystem);
   
           // 配置内部Artifactory仓库（替换为实际地址）
           RemoteRepository internalRepo = new RemoteRepository.Builder("internal-artifactory", "default", "http://your-artifactory-url/repository/maven-public/")
                   .build();
           session.setRemoteRepositories(List.of(internalRepo));
   
           // 加载目标项目POM
           File pomFile = new File("/path/to/your/project/pom.xml");
           DefaultModelBuilder modelBuilder = new DefaultModelBuilderFactory().newInstance();
           ModelBuildingRequest request = new DefaultModelBuildingRequest()
                   .setPomFile(pomFile)
                   .setRepositorySession(session)
                   .setValidationLevel(ModelBuildingRequest.VALIDATION_LEVEL_MINIMAL);
   
           // 构建模型并打印依赖树
           Model model = modelBuilder.build(request).getEffectiveModel();
           System.out.println("项目依赖树：");
           printDependencyTree(model.getDependencies(), 0);
       }
   
       private static void printDependencyTree(List<org.apache.maven.model.Dependency> dependencies, int depth) {
           String indent = "  ".repeat(depth);
           for (org.apache.maven.model.Dependency dep : dependencies) {
               System.out.printf("%s%s:%s:%s%n", indent, dep.getGroupId(), dep.getArtifactId(), dep.getVersion());
               // 如需递归解析传递依赖，可扩展此处逻辑：通过仓库系统获取依赖的POM并继续解析
           }
       }
   }
   

   注意：替换代码中的仓库地址和POM路径，若仓库需要认证，需在仓库配置中添加用户名和密码。

内容的提问来源于stack exchange，提问作者himanshu_mps