blocks|key|363091|text|查看Maven+Properties+Guide...|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|363092|正如Seshagiri在评论中指出的那样，${env.VARIABLE_NAME}会做你想做的事情。|style|CODE|363093|我将添加一句警告，并指出pom.xml应该完整地描述您的项目，因此请明智地使用环境变量。如果您使构建依赖于您的环境，则很难重现它们。|363094|entityMap|0|LINK|mutability|MUTABLE|url|http://books.sonatype.com/mvnref-book/reference/resource-filtering-sect-properties.html^0|2|M|0|0|L|K|0|C|7|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]]|C|$]]|$1|D|3|E|5|6|7|V|8|@$A|W|B|X|F|G]]|9|@]|C|$]]|$1|H|3|I|5|6|7|Y|8|@$A|Z|B|10|F|G]]|9|@]|C|$]]|$1|J|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|K|$L|$5|M|N|O|C|$P|Q]]]]

Check out the <a href="http://books.sonatype.com/mvnref-book/reference/resource-filtering-sect-properties.html" rel="noreferrer">Maven Properties Guide</a>...

As Seshagiri pointed out in the comments, <code>${env.VARIABLE_NAME}</code> will do what you want.

I will add a word of warning and say that a <code>pom.xml</code> should completely describe your project so please use environment variables judiciously. If you make your builds dependent on your environment, they are harder to reproduce

blocks|key|578823|text|将环境变量直接传递给maven系统属性可能更安全。例如，假设在Linux上，您想要访问环境变量MY_VARIABLE。您可以在pom文件中使用系统属性。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|578824|<properties>
++++...
++++
++++<my.variable>foo</my.variable>
++++...
</properties>
...

...+${my.variable}+...|code-block|syntax|javascript|578825|在maven命令行上设置属性值：|578826|mvn+clean+package+-Dmy.variable=$MY_VARIABLE|578827|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

It might be safer to directly pass environment variables to maven system properties. For example, say on Linux you want to access environment variable MY_VARIABLE. You can use a system property in your pom file.

<pre><code>&lt;properties&gt;
 ...
 &lt;!-- Default value for my.variable can be defined here --&gt;
 &lt;my.variable&gt;foo&lt;/my.variable&gt;
 ...
&lt;/properties&gt;
...
&lt;!-- Use my.variable --&gt;
... ${my.variable} ...
</code></pre>

Set the property value on the maven command line:

<pre><code>mvn clean package -Dmy.variable=$MY_VARIABLE
</code></pre>

blocks|key|578852|text|我们不能用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|578853|<properties>
++++<my.variable>${env.MY_VARIABLE}</my.variable>
</properties>|code-block|syntax|javascript|578854|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Can't we use

<pre><code>&lt;properties&gt;
 &lt;my.variable&gt;${env.MY_VARIABLE}&lt;/my.variable&gt;
&lt;/properties&gt;
</code></pre>

blocks|key|363204|text|您可以使用<properties>标记定义自定义变量，并使用${variable}模式来使用它|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|363205|<project+xmlns="http://maven.apache.org/POM/4.0.0"+xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"+xsi:schemaLocation="http://maven.apache.org/POM/4.0.0+http://maven.apache.org/maven-v4_0_0.xsd">

++++
++++<properties>
++++++++<property.name>1.0</property.name>
++++</properties>

++++
++++<version>${property.name}</version>

</project>|code-block|syntax|javascript|363206|entityMap^0|5|C|U|B|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

You can use <code>&lt;properties&gt;</code> tag to define a custom variable and <code>${variable}</code> pattern to use it 

<pre><code>&lt;project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"&gt;

 &lt;!-- define --&gt;
 &lt;properties&gt;
 &lt;property.name&gt;1.0&lt;/property.name&gt;
 &lt;/properties&gt;

 &lt;!-- using --&gt;
 &lt;version&gt;${property.name}&lt;/version&gt;

&lt;/project&gt;
</code></pre>

I am using maven as build tool. I have set an environment variable called <code>env</code>. How can I get access to this environment variable's value in the <code>pom.xml</code> file?

How to refer environment variable in POM.xml?

Linux

我使用maven作为构建工具。我设置了一个名为env的环境变量。如何在pom.xml文件中访问此环境变量的值？

问如何在POM.xml中引用环境变量？
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