在所有上传工件之后,maven 是否总是部署 maven-metadata.xml 文件

Does maven alway deploys maven-metadata.xml file after all uploading artifacts

maven 部署工件有顺序吗?据我所知,我可以说它上传了所有工件,最后它更新了 maven-medata.xml 文件

http://localhost:8000/mavenrepository/test1/com/mypackage/mavenproject1/1.0-SNAPSHOT/maven-metadata.xml http://localhost:8000/mavenrepository/test1/com/mypackage/mavenproject1/maven-metadata.xml

现在是否保证 maven 在上传其他工件后总是最后上传这 2 个文件?

Maven 总是以相同的顺序部署工件文件。它通常看起来像这样:

[INFO] --- maven-deploy-plugin:2.7:deploy (default-deploy) @ hello-world ---
Downloading: http://localhost:48080/storages/storage0/snapshots/org/foo/examples/hello-world/1.0-SNAPSHOT/maven-metadata.xml
Uploading: http://localhost:48080/storages/storage0/snapshots/org/foo/examples/hello-world/1.0-SNAPSHOT/hello-world-1.0-20160430.031713-1.jar
Uploaded: http://localhost:48080/storages/storage0/snapshots/org/foo/examples/hello-world/1.0-SNAPSHOT/hello-world-1.0-20160430.031713-1.jar (3 KB at 11.5 KB/sec)
Uploading: http://localhost:48080/storages/storage0/snapshots/org/foo/examples/hello-world/1.0-SNAPSHOT/hello-world-1.0-20160430.031713-1.pom
Uploaded: http://localhost:48080/storages/storage0/snapshots/org/foo/examples/hello-world/1.0-SNAPSHOT/hello-world-1.0-20160430.031713-1.pom (2 KB at 41.6 KB/sec)
Downloading: http://localhost:48080/storages/storage0/snapshots/org/foo/examples/hello-world/maven-metadata.xml
Uploading: http://localhost:48080/storages/storage0/snapshots/org/foo/examples/hello-world/1.0-SNAPSHOT/maven-metadata.xml
Uploaded: http://localhost:48080/storages/storage0/snapshots/org/foo/examples/hello-world/1.0-SNAPSHOT/maven-metadata.xml (798 B at 21.1 KB/sec)
Uploading: http://localhost:48080/storages/storage0/snapshots/org/foo/examples/hello-world/maven-metadata.xml
Uploaded: http://localhost:48080/storages/storage0/snapshots/org/foo/examples/hello-world/maven-metadata.xml (312 B at 8.7 KB/sec)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------

如您所见,它做的第一件事是尝试在工件级别解析 maven-metadata.xml 文件,以便弄清楚该工件是否有其他版本以及是否生成全新的maven-metadata.xml 文件,或用它正在部署的新版本更新现有文件(如果有的话)。 maven-metadata.xml 文件始终在部署结束时生成或更新。

maven-metadata.xml 个文件可以位于三个级别:

  • 工件级别:这在 groupId/artifactId 级别,(例如,如果您的 groupIdorg.foo.examples 而您的 artifactIdhello-world,路径将为 org/foo/examples/hello-world/maven-metadata.xml)。这用于管理基础版本或发布版本。
  • 版本级别:这在 groupId/artifactId/version 级别,(例如,如果您的 groupIdorg.foo.examples 并且您的 artifactIdhello-world,版本是 1.0-SNAPSHOT,路径将是 org/foo/examples/hello-world/1.0-SNAPSHOT/maven-metadata.xml)。这用于管理带时间戳的快照。
  • 插件组级别:插件的groupId级别,用于同一插件组下不同插件的管理。

有关 Maven 元数据如何工作的非常详细的解释,请查看我整理的 this article