如何获取 settings.xml 中定义的服务器值以在我的 pom.xml 中使用它们? [英] How to get the values of server defined in the settings.xml to use them in my pom.xml?

问题描述

我知道我可以使用属性检索一些 settings.xml 参数，例如 ${settings.localRepository} 以获取本地存储库的位置.

I know I can retrieve some settings.xml parameters using properties, like, for example ${settings.localRepository} to get the location of the local repository.

现在假设我的 settings.xml 包含以下服务器定义:

Now imagine my settings.xml contains the following servers definition:

<servers>
    <server>
        <id>server-dev</id>
        <username>devuser</username>
        <password>devpass</password>
    </server>
    <server>
        <id>server-hom</id>
        <username>homuser</username>
        <password>hompass</password>
    </server>
</servers>

有没有办法，给定服务器的 id 来获取任何参数的值?例如，像 ${settings.servers.server.server-dev.username} 这样的东西会返回 devuser.

Is there a way, given an id of a server to get the value of any parameter? For example, something like ${settings.servers.server.server-dev.username} would return devuser.

我已经尝试了以下方法:

I've already tried the following:

${settings.servers.server.server-dev.username}
${settings.servers.server-dev.username}
${settings.servers.server[server-dev].username}
${settings.servers[server-dev].username}

但他们都没有工作......

but none of them worked...

关于这个页面，这是不可能的.但是，由于它是一个没有正确记录的功能，我仍然希望以这种方式做到这一点......

Regarding this page, this is not possible. However, as it is a feature not correctly documented, I still have some hope to do that in this way...

推荐答案

我认为这是不可能的，并且认为公开这些属性的值是一个坏主意.

I don't think it's possible and believe it would be a bad idea to expose the value of these properties.

如 设置参考 中所述，具有 <settings.xml 中的 ;servers> 不会与 pom 一起分发诸如 username 或 password 之类的值.xml.因此，公开属性以从任何地方读取它们只会违反这一原则，并且可能是一个安全问题.

As explained in the Settings Reference, the point of having <servers> in the settings.xml is to not distribute values such as username or password along with the pom.xml. So exposing properties to read them from anywhere would just break this principle and may be a security issue.

我又在思考这个问题，我说的不是真的.

I'm thinking again about this and what I said is not true.

AFAIK，Maven 不会公开设置中定义的服务器的 username 和 password 属性和/或提供类似于 OP 描述的机制.但是能够从 pom.xml 访问它们并没有错.

AFAIK, Maven doesn't expose the username and password properties of a server defined in the settings and/or provide a mechanism similar to what the OP described. But it wouldn't be wrong to be able to access them from a pom.xml.

话虽如此，正如 Rich 指出的那样，Maven API 使您可以访问设置中定义的服务器(请参阅 org.apache.maven.settings.Settings#getServer(String serverId)) 所以必须可以从 Mojo 设置属性(即在自定义插件中).

Having that said, as Rich pointed out, the Maven API gives you access to the servers defined in settings (see org.apache.maven.settings.Settings#getServer(String serverId)) so it must be possible to set properties from a Mojo (i.e. in a custom plugin).

但我实际上不确定您到底想做什么，也许使用 和配置文件会是更好的方法.处理常见的环境属性(但特定值)是配置文件的一个很好的用例.查看章节 11.5.1.常见环境和11.5.2保护Maven:权威指南一书中的秘密.

But I'm actually not sure of what you're exactly trying to do and maybe using <properties> and profiles would be a better approach. Dealing with common environment properties (but specific values) is a good use case for profiles. Check out the chapters 11.5.1. Common Environments and 11.5.2 Protecting Secrets of the Maven: The Definitive Guide book.

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