Maven:如何检查工件是否存在? [英] Maven: How to check if an artifact exists?

问题描述

如何在Mojo内部检查本地存储库中是否已存在工件?

How do I check from within a Mojo if an artifact already exists in the local repository?

我正在将大型二进制文件安装到本地Maven存储库中，在尝试下载大型二进制文件之前，我需要知道它们是否已经存在.

I'm installing large binaries into the local Maven repository and I need to know if they already exist before attempting to download them.

推荐答案

在

如果要检查远程工件是否存在而无需下载它，可以使用 Aether库执行以下操作(基于 http://dev.eclipse.org/mhonarc/lists/aether-users/msg00127.html ):

If you want to check if a remote artifact exists without downloading it, you can use the Aether library to do the following (based on http://dev.eclipse.org/mhonarc/lists/aether-users/msg00127.html):

MavenDefaultLayout defaultLayout = new MavenDefaultLayout();
RemoteRepository centralRepository = new RemoteRepository.Builder("central", "default", "http://repo1.maven.org/maven2/").build();
URI centralUri = URI.create(centralRepository.getUrl());
URI artifactUri = centralUri.resolve(defaultLayout.getPath(artifact));
HttpURLConnection connection = (HttpURLConnection) artifactUri.toURL().openConnection();
connection.setRequestMethod("HEAD");
connection.connect();
boolean artifactExists = connection.getResponseCode() != 404;

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