也许这将是一个比我原先想象的更大的任务，但无论如何，我正在尝试从文件加载MavenProject然后解决其依赖关系。我有两个位的代码，但我缺少一些我需要的对象引用;特别是我需要获取RepositorySystemSession和RepositorySystem的实例。有什么提示吗？
注意：我已使用maven-plugin标记了此问题，但这不是Maven插件。我很高兴要求Maven 3（想想我已经有了......）
这是我到目前为止的代码：
构建MavenProject ：
public static MavenProject loadProject(File pomFile) throws Exception
{
MavenProject ret = null;
MavenXpp3Reader mavenReader = new MavenXpp3Reader();
if (pomFile != null && pomFile.exists())
{
FileReader reader = null;
try
{
reader = new FileReader(pomFile);
Model model = mavenReader.read(reader);
model.setPomFile(pomFile);
ret = new MavenProject(model);
}
finally
{
// Close reader
}
}
return ret;
}
解决依赖关系：
public static List<Dependency> getArtifactsDependencies(MavenProject project, String dependencyType, String scope) throws Exception
{
DefaultArtifact pomArtifact = new DefaultArtifact(project.getId());
RepositorySystemSession repoSession = null; // TODO
RepositorySystem repoSystem = null; // TODO
List<RemoteRepository> remoteRepos = project.getRemoteProjectRepositories();
List<Dependency> ret = new ArrayList<Dependency>();
Dependency dependency = new Dependency(pomArtifact, scope);
CollectRequest collectRequest = new CollectRequest();
collectRequest.setRoot(dependency);
collectRequest.setRepositories(remoteRepos);
DependencyNode node = repoSystem.collectDependencies(repoSession, collectRequest).getRoot();
DependencyRequest projectDependencyRequest = new DependencyRequest(node, null);
repoSystem.resolveDependencies(repoSession, projectDependencyRequest);
PreorderNodeListGenerator nlg = new PreorderNodeListGenerator();
node.accept(nlg);
ret.addAll(nlg.getDependencies(true));
return ret;
}
我意识到这可能是一个不寻常的请求，也许我应该废弃我想要做的事情并将其作为插件包装......但我只是想完成我现在开始的事情！提前谢谢。
答案 0 :(得分：5)
我建议阅读有关Aether lib的信息，这正是出于此类目的。
注意：以太是先前在Sonatype开发的，但后来转移到Eclipse。
答案 1 :(得分：5)
尝试jcabi-aether，这是来自Sonatype的Apache Aether的包装：
final File repo = this.session.getLocalRepository().getBasedir();
final Collection<Artifact> deps = new Aether(this.getProject(), repo).resolve(
new DefaultArtifact("junit", "junit-dep", "", "jar", "4.10"),
JavaScopes.RUNTIME
);
如果你不在Maven插件中：
final File repo = new File(System.getProperty("java.io.tmpdir"), "my-repo");
final MavenProject project = new MavenProject();
project.setRemoteArtifactRepositories(
Arrays.asList(
new RemoteRepository(
"maven-central",
"default",
"http://repo1.maven.org/maven2/"
)
)
);
final Collection<Artifact> deps = new Aether(project, repo).resolve(
new DefaultArtifact("junit", "junit-dep", "", "jar", "4.10"),
JavaScopes.RUNTIME
);
答案 2 :(得分：3)
我刚刚为你和我的问题提出了一个解决方案：
/*******************************************************************************
* Copyright (c) 2013 TerraFrame, Inc. All rights reserved.
*
* This file is part of Runway SDK(tm).
*
* Runway SDK(tm) is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* Runway SDK(tm) is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Runway SDK(tm). If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/
package com.test.mavenaether;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.artifact.repository.ArtifactRepositoryPolicy;
import org.apache.maven.artifact.repository.MavenArtifactRepository;
import org.apache.maven.artifact.repository.layout.DefaultRepositoryLayout;
import org.apache.maven.model.Model;
import org.apache.maven.model.io.xpp3.MavenXpp3Reader;
import org.apache.maven.project.MavenProject;
import org.codehaus.plexus.util.xml.pull.XmlPullParserException;
import org.sonatype.aether.artifact.Artifact;
import org.sonatype.aether.resolution.DependencyResolutionException;
import org.sonatype.aether.util.artifact.DefaultArtifact;
import org.sonatype.aether.util.artifact.JavaScopes;
import com.jcabi.aether.Aether;
public class MavenAether
{
public static void main(String[] args) throws Exception
{
String classpath = getClasspathFromMavenProject(new File("/users/terraframe/documents/workspace/MavenSandbox/pom.xml"), new File("/users/terraframe/.m2/repository"));
System.out.println("classpath = " + classpath);
}
public static String getClasspathFromMavenProject(File projectPom, File localRepoFolder) throws DependencyResolutionException, IOException, XmlPullParserException
{
MavenProject proj = loadProject(projectPom);
proj.setRemoteArtifactRepositories(
Arrays.asList(
(ArtifactRepository) new MavenArtifactRepository(
"maven-central", "http://repo1.maven.org/maven2/", new DefaultRepositoryLayout(),
new ArtifactRepositoryPolicy(), new ArtifactRepositoryPolicy()
)
)
);
String classpath = "";
Aether aether = new Aether(proj, localRepoFolder);
List<org.apache.maven.model.Dependency> dependencies = proj.getDependencies();
Iterator<org.apache.maven.model.Dependency> it = dependencies.iterator();
while (it.hasNext()) {
org.apache.maven.model.Dependency depend = it.next();
final Collection<Artifact> deps = aether.resolve(
new DefaultArtifact(depend.getGroupId(), depend.getArtifactId(), depend.getClassifier(), depend.getType(), depend.getVersion()),
JavaScopes.RUNTIME
);
Iterator<Artifact> artIt = deps.iterator();
while (artIt.hasNext()) {
Artifact art = artIt.next();
classpath = classpath + " " + art.getFile().getAbsolutePath();
}
}
return classpath;
}
public static MavenProject loadProject(File pomFile) throws IOException, XmlPullParserException
{
MavenProject ret = null;
MavenXpp3Reader mavenReader = new MavenXpp3Reader();
if (pomFile != null && pomFile.exists())
{
FileReader reader = null;
try
{
reader = new FileReader(pomFile);
Model model = mavenReader.read(reader);
model.setPomFile(pomFile);
ret = new MavenProject(model);
}
finally
{
reader.close();
}
}
return ret;
}
}
的pom.xml：
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.test</groupId>
<artifactId>MavenSandbox</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>com.jcabi</groupId>
<artifactId>jcabi-aether</artifactId>
<version>0.7.19</version>
</dependency>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-core</artifactId>
<version>3.0.3</version>
</dependency>
</dependencies>
</project>
代码首先加载Maven项目（使用原始问题中提供的函数），然后使用jcabi-aether在本地存储库中查找工件。您需要更改main函数中的两个参数：项目的pom.xml的位置以及本地存储库的位置。
享受！ ：）
答案 3 :(得分：2)
试试这个（从ather-demo可以看出）：
...
LocalRepository localRepository = new LocalRepository("/path/to/local-repo");
RepositorySystem system = getRepositorySystemInstance();
RepositorySystemSession session = getRepositorySystemSessionInstance(system, localRepository);
....
public static RepositorySystem getRepositorySystemInstance()
{
/**
* Aether's components implement org.sonatype.aether.spi.locator.Service to ease manual wiring and using the
* prepopulated DefaultServiceLocator, we only need to register the repository connector factories.
*/
MavenServiceLocator locator = new MavenServiceLocator();
locator.addService(RepositoryConnectorFactory.class, FileRepositoryConnectorFactory.class);
locator.addService(RepositoryConnectorFactory.class, WagonRepositoryConnectorFactory.class);
locator.setServices(WagonProvider.class, new ManualWagonProvider());
return locator.getService(RepositorySystem.class);
}
private static RepositorySystemSession getRepositorySystemSessionInstance(RepositorySystem system,
LocalRepository localRepo)
{
MavenRepositorySystemSession session = new MavenRepositorySystemSession();
session.setLocalRepositoryManager(system.newLocalRepositoryManager(localRepo));
session.setTransferListener(new ConsoleTransferListener());
session.setRepositoryListener(new ConsoleRepositoryListener());
// Set this in order to generate dirty trees
session.setDependencyGraphTransformer(null);
return session;
}
答案 4 :(得分：2)
Eclipses Aether API有一套很好的独立示例，在最新的Maven（3.1.1）中使用，可以找到here。
注意：Maven 3.1.X仍然使用以太0.9.0.M2（我们在示例中使用的最新版本是0.9.0.M3）。因此，要在Maven插件中运行这些示例，需要版本M2，并且独立应用程序可以使用最新的M3版本。
答案 5 :(得分：0)
RepositorySystem的"Aether/Setting Aether Up"和eclipse wiki的"Aether/Creating a Repository System Session"中都有这个内容。
没有大量文档，但您可以按如下方式创建RepositorySystem：
// verbatim copy from the Setting Aether Up link
private static RepositorySystem newRepositorySystem()
{
DefaultServiceLocator locator = MavenRepositorySystemUtils.newServiceLocator();
locator.addService( RepositoryConnectorFactory.class, BasicRepositoryConnectorFactory.class );
locator.addService( TransporterFactory.class, FileTransporterFactory.class );
locator.addService( TransporterFactory.class, HttpTransporterFactory.class );
return locator.getService( RepositorySystem.class );
}
请注意，这需要"Getting Aether"中详述的依赖关系，最明显的是maven-aether-provider。
当您拥有存储库系统时，本教程将继续使用以下工厂方法创建RepositorySystemSession：
// copied verbatim from "Creating a Repository System Session"
private static RepositorySystemSession newSession( RepositorySystem system )
{
DefaultRepositorySystemSession session = MavenRepositorySystemUtils.newSession();
LocalRepository localRepo = new LocalRepository( "target/local-repo" );
session.setLocalRepositoryManager( system.newLocalRepositoryManager( session, localRepo ) );
return session;
}