Java无法从pom读取变量 [英] Java unable to read variables from pom

问题描述

  MY_VARIABLE = www.google.com 
  

我的pom文件代码看起来像这样

 < build> 
 
< pluginManagement> 
< testResources> 
< testResource> 
< directory> src / test / resources< / directory> 
< filtering> true< / filtering> 
< / testResource> 
< / testResources> 
< plugins> 
 
< plugin> 
< groupId> org.apache.maven.plugins< / groupId> 
< artifactId> maven-failuresafe-plugin< / artifactId> 
< version> 2.16< / version> 
 
<执行> 
< execution> 
< phase> validate< / phase> 
< goals> 
< goal> read-project-properties< / goal> 
< / goals> 
< configuration> 
< includes> 
< include> ** / * Test * .java< / include> 
< include> ** / *测试* .java< / include> 
< include> ** / Test * .java< / include> 
< / includes> 
< files> 
< file> src / test / resources / maven.properties< / file> 
< / files> 
 
< systemPropertyVariables> 
< message> $ {MY_VARIABLE}< / message> 
< / systemPropertyVariables> 
 
< / configuration> 
< / execution> 
< / executions> 
 
< / plugin> 
 
 
< plugin> 
< groupId> org.apache.maven.plugins< / groupId> 
< artifactId> maven-surefire-plugin< / artifactId> 
< version> 2.16< / version> 
< / plugin> 
< / plugins> 
< / pluginManagement> 
< / build> 
  

最后我有一段代码来检索消息变量中的值。

  public static String getMsg（）
 {
 final String msg = System.getProperty（message）; 
 if（StringUtils.isEmpty（msg）|| url.startsWith（$ {））
 {
返回空消息; 
} 
 return msg; 
} 
  

所以当我调用getMsg（）方法时，它总是返回值的msg为空消息。

在pom.xml声明中是否有一些错误，或者是正在使用的getMsg（）函数中有些问题。

有人可能会对此有所裨益。

提前感谢....

解决方案

如果没有错误，您需要使用以下语法

 < properties> 
< message> $ {MY_VARIABLE}< / message> 
< / properties> 
  

systemPropertyVariables用于Surefire pluging，用于单元测试

I have the following line in my maven.properties file.

   MY_VARIABLE = www.google.com

My pom file code looks like this

    <build>

    <pluginManagement>
        <testResources>
            <testResource>
                <directory>src/test/resources</directory>
                <filtering>true</filtering>
            </testResource>
        </testResources>
        <plugins>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-failsafe-plugin</artifactId>
                <version>2.16</version>

                <executions>
                    <execution>
                        <phase>validate</phase>
                        <goals>
                            <goal>read-project-properties</goal>
                        </goals>
                        <configuration>
                            <includes>
                                <include>**/*Test*.java</include>
                                <include>**/*Tests*.java</include>
                                <include>**/Test*.java</include>
                            </includes>
                            <files>
                                <file>src/test/resources/maven.properties</file>
                            </files>

                            <systemPropertyVariables>
                                <message>${MY_VARIABLE}</message>
                            </systemPropertyVariables>

                        </configuration>
                    </execution>
                </executions>

            </plugin>


            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.16</version>
            </plugin>
        </plugins>
    </pluginManagement>
</build>

And finally i have a piece of code to retrieve the value in the message variable.

   public static String getMsg() 
   {
      final String msg = System.getProperty("message");
      if (StringUtils.isEmpty(msg) || url.startsWith("${")) 
      {
          return "Empty message";
      }
      return msg;
   }

So when i am calling the getMsg() method, it always returns the value of msg as Empty Message.

Is it some error in the pom.xml declaration or is it some problem in the getMsg() function that is being used.

It would be nice of someone could throw some light on this.

Thanks in advance ....

解决方案

If I'm not mistaken, you need to use the following syntax

<properties>
  <message>${MY_VARIABLE}</message>
</properties>

systemPropertyVariables are for the Surefire pluging, for unit testing

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