[英]How can I get Jetty to scan the Maven dependency jar files in the class path?
[英]How to get path to dependency jar with maven
给定一个简单的 Maven 项目,例如 JUnit 作为依赖项,我如何获得它要安装到的本地 Maven 存储库中junit.jar
的完整文件路径?!
例如,如何从工件junit:junit
到/Users/foobar/.m2/repository/junit/junit/4.11/junit-4.11.jar
?
maven 依赖插件有一个目标“属性”。 从文档:
为每个项目依赖项设置指向工件文件的属性的目标。 对于每个依赖项(直接和传递),将设置一个项目属性,该属性遵循 groupId:artifactId:type:[classifier] 形式并包含解析工件的路径。
所以这样的事情应该可以解决问题:
<properties>
<maven-dependency-plugin.version>3.1.1</maven-dependency-plugin.version>
</properties>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>${maven-dependency-plugin.version}</version>
<executions>
<execution>
<phase>initialize</phase>
<goals>
<goal>properties</goal>
</goals>
</execution>
</executions>
</plugin>
那么属性${junit:junit:jar}
应该包含 jar 文件路径
从以下 SO answer来看,最简单的方法是使用 antrun 插件。
<plugin>
<artifactId>maven-antrun-plugin</artifactId>
<executions>
<execution>
<phase>process-resources</phase>
<configuration>
<tasks>
<echo>${maven.dependency.junit.junit.jar.path}</echo>
</tasks>
</configuration>
<goals>
<goal>run</goal>
</goals>
</execution>
</executions>
</plugin>
使用mvn dependency:build-classpath
和一些 unix shell 魔法从类路径中提取 jar-path 的hacky 解决方案。
我们有一个像这样的pom.xml
......
<?xml version="1.0" encoding="UTF-8"?>
<project>
<modelVersion>4.0.0</modelVersion>
<groupId>com.mycompany</groupId>
<artifactId>myproject</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
然后我们生成一个build_classpath
文件。
$ mvn dependency:build-classpath -Dmdep.outputFile=build_classpath
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building myproject 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-dependency-plugin:2.8:build-classpath (default-cli) @ myproject ---
[INFO] Wrote classpath file '/Users/foobar/maven-test/build_classpath'.
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.050 s
[INFO] Finished at: 2015-01-23T09:17:40+01:00
[INFO] Final Memory: 11M/245M
[INFO] ------------------------------------------------------------------------
$ cat build_classpath
/Users/foobar/.m2/repository/junit/junit/4.11/junit-4.11.jar:/Users/foobar/.m2/repository/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3.jar
现在我们可以使用一些脚本 foo... 从build_classpath
提取 jar 文件路径。
$ cat build_classpath | perl -ne 'print "$1" if /(?:^|:)([^:]+?\/junit-[0-9\.]+\.jar)/'
/Users/foobar/.m2/repository/junit/junit/4.11/junit-4.11.jar
路径构建为 $repository_dir/groupId/artifactId/version/artifactId-version.jar
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
如果要获取运行代码中的路径,可以执行以下操作:
聚甲醛:
<dependency>
<groupId>com.github.nodyn</groupId>
<artifactId>jvm-npm</artifactId>
<version>a0c3f12</version>
</dependency>
<dependency>
<groupId>org.eclipse.aether</groupId>
<artifactId>aether-impl</artifactId>
<version>1.1.0</version>
</dependency>
<dependency>
<groupId>org.eclipse.aether</groupId>
<artifactId>aether-transport-file</artifactId>
<version>1.1.0</version>
</dependency>
<dependency>
<groupId>org.eclipse.aether</groupId>
<artifactId>aether-connector-basic</artifactId>
<version>1.1.0</version>
</dependency>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-aether-provider</artifactId>
<version>3.1.0</version>
</dependency>
代码:
final String mavenRepositoryPath = "c:\\mvn\\repository";
private static RepositorySystem newRepositorySystem() {
DefaultServiceLocator locator = MavenRepositorySystemUtils.newServiceLocator();
locator.addService(RepositoryConnectorFactory.class, BasicRepositoryConnectorFactory.class);
locator.addService(TransporterFactory.class, FileTransporterFactory.class);
locator.setErrorHandler(new DefaultServiceLocator.ErrorHandler() {
@Override
public void serviceCreationFailed(Class<?> type, Class<?> impl, Throwable exception) {
throw new RuntimeException(exception);
}
});
return locator.getService(RepositorySystem.class);
}
private static File getJvmNpmFile() {
Artifact artifact = new DefaultArtifact("com.github.nodyn:jvm-npm:a0c3f12");
DefaultRepositorySystemSession session = new org.eclipse.aether.DefaultRepositorySystemSession();
RepositorySystem system = newRepositorySystem();
ArtifactRequest request = new ArtifactRequest();
request.setArtifact(artifact);
//request.setRepositories(new ArrayList<>( Arrays.asList( new RemoteRepository.Builder( "central", "default", "http://central.maven.org/maven2/" ).build()) ));
//request.setRepositories( new org.eclipse.aether.DefaultRepositorySystemSession().getLocalRepository() );
LocalRepository localRepo = new LocalRepository(mvnRepositoryPath);
session.setLocalRepositoryManager(system.newLocalRepositoryManager(session, localRepo));
ArtifactResult result;
try {
result = system.resolveArtifact(session, request);
} catch (ArtifactResolutionException ex) {
throw new RuntimeException(ex);
}
//System.out.println("Resolved artifact " + artifact + " to " + result.getArtifact().getFile() + " from " + result.getRepository());
return result.getArtifact().getFile();
}
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