我如何可以下载一个插件中的Maven的文物？(How can I download Maven ar

我有一个Maven插件，在其confiugration需要的groupId，artifactId和版本。

我希望能够从远程仓库下载神器然后将该文件复制到项目中。我无法弄清楚如何下载虽然神器。

我知道我可以解决您在使用的依赖插件的依赖关系，但我需要我的插件内发生。我怎样才能做到这一点？

你的插件需要创建使用ArtifactFactory和的groupId，artifactId的和人为的版本中自举的神器，那神器传递到ArtifactResolver处理发现/下载。

解析器需要访问本地存储库和远程存储库。好消息是，所有这些都是你可以声明在你的Mojo的依赖，并丛它们连接为您丛组件。

在另一个答案我展示了如何做到这一点。在你的情况，你需要稍微不同参数的简化版本读取的groupId，artifactId和version。在下面的插件，各种部件被声明为丛部件，并申报的groupId，artifactId的，版本和包装类型的属性。

package name.seller.rich.maven.plugins.bootstrap;

import java.util.List;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.factory.ArtifactFactory;
import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.artifact.resolver.ArtifactNotFoundException;
import org.apache.maven.artifact.resolver.ArtifactResolutionException;
import org.apache.maven.artifact.resolver.ArtifactResolver;
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;

/**
 * Obtain the artifact defined by the groupId, artifactId, and version
 * from the remote repository.
 * 
 * @goal bootstrap
 */
public class BootstrapAppMojo extends AbstractMojo {

    /**
     * Used to look up Artifacts in the remote repository.
     * 
     * @parameter expression=
     *  "${component.org.apache.maven.artifact.factory.ArtifactFactory}"
     * @required
     * @readonly
     */
    protected ArtifactFactory factory;

    /**
     * Used to look up Artifacts in the remote repository.
     * 
     * @parameter expression=
     *  "${component.org.apache.maven.artifact.resolver.ArtifactResolver}"
     * @required
     * @readonly
     */
    protected ArtifactResolver artifactResolver;

    /**
     * List of Remote Repositories used by the resolver
     * 
     * @parameter expression="${project.remoteArtifactRepositories}"
     * @readonly
     * @required
     */
    protected List remoteRepositories;

    /**
     * Location of the local repository.
     * 
     * @parameter expression="${localRepository}"
     * @readonly
     * @required
     */
    protected ArtifactRepository localRepository;

    /**
     * The target pom's artifactId
     * 
     * @parameter expression="${bootstrapArtifactId}"
     * @required
     */
    private String bootstrapArtifactId;

    /**
     * The target pom's groupId
     * 
     * @parameter expression="${bootstrapGroupId}"
     * @required
     */
    private String bootstrapGroupId;

    /**
     * The target pom's type
     * 
     * @parameter expression="${bootstrapType}"
     * @required
     */
    private String bootstrapType;

    /**
     * The target pom's version
     * 
     * @parameter expression="${bootstrapVersion}"
     * @required
     */
    private String bootstrapVersion;

    public void execute() throws MojoExecutionException, MojoFailureException {
        try {
            Artifact pomArtifact = this.factory.createArtifact(
                bootstrapGroupId, bootstrapArtifactId, bootstrapVersion,
                "", bootstrapType);

            artifactResolver.resolve(pomArtifact, this.remoteRepositories,
                this.localRepository);
        } catch (ArtifactResolutionException e) {
            getLog().error("can't resolve parent pom", e);
        } catch (ArtifactNotFoundException e) {
            getLog().error("can't resolve parent pom", e);
        }
    }
}

这是被配置为使用该插件（并下载aspectjrt 1.6.4 POM）聚甲醛的例子：

<?xml version="1.0" encoding="UTF-8"?>
<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>name.seller.rich</groupId>
  <artifactId>bootstrap-test</artifactId>
  <version>1.0.0</version>
    <build>
      <plugins>
        <plugin>
          <groupId>name.seller.rich</groupId>
          <artifactId>maven-bootstrap-plugin</artifactId>
          <executions>
            <execution>
              <phase>package</phase>
              <goals>
                <goal>bootstrap</goal>
              </goals>
              <configuration>
                <bootstrapGroupId>org.aspectj</bootstrapGroupId>
                <bootstrapArtifactId>aspectjrt</bootstrapArtifactId>
                <bootstrapVersion>1.6.4</bootstrapVersion>
                <bootstrapType>pom</bootstrapType>
              </configuration>
            </execution>
          </executions>
        </plugin>
    </plugins>
  </build>
</project>