在 Ant 中，如何动态构建引用属性文件的属性? [英] In Ant, how can I dynamically build a property that references a property file?

问题描述

我正在使用输入任务来收集特定的属性值，并且我想将这些值连接成一个引用我的属性文件的属性值.

I am using Input tasks to collect specific property values and I want to concatenate those into one property value that references my properties file.

我可以生成属性的格式，但在运行时它被视为字符串而不是属性引用.

I can generate the format of the property but at runtime it is treated as a string and not a property reference.

示例属性文件:

# build.properties

# Some Server Credentials
west.1.server = TaPwxOsa
west.2.server = DQmCIizF
east.1.server = ZCTgqq9A

示例构建文件:

<property file="build.properties"/>
<target name="login">
 <input message="Enter Location:" addproperty="loc" />      
 <input message="Enter Sandbox:" addproperty="box" />
 <property name="token" value="\$\{${loc}.${box}.server}" />
 <echo message="${token}"/>
</target>

当我调用 login 并为输入值提供west"和1"时，echo 将打印 ${west.1.server} 但它不会从属性文件中检索属性值.

When I call login and provide "west" and "1" for the input values, echo will print ${west.1.server} but it will not retrieve the property value from the properties file.

如果我对消息中的属性值进行硬编码:

If I hardcode the property value in the message:

<echo message="${west.1.server}"/>

然后 Ant 将尽职尽责地从属性文件中检索字符串.

then Ant will dutifully retrieve the string from the properties file.

如何让 Ant 接受动态生成的属性值并将其视为要从属性文件中检索的属性?

How can I get Ant to accept the dynamically generated property value and treat it as a property to be retrieved from the properties file?

推荐答案

使用 Props antlib<的附加示例/a>.
需要 Ant >= 1.8.0(适用于最新的 Ant 版本 1.9.4)和 Props antlib 二进制文件.

Additional example using the Props antlib.
Needs Ant >= 1.8.0 (works fine with latest Ant version 1.9.4) and Props antlib binaries.

官方Props antlib GIT 存储库(或此处)不起作用开箱即用:

The current build.xml in official Props antlib GIT Repository (or here) doesn't work out of the box :

BUILD FAILED
Target "compile" does not exist in the project "props".

获取props antlib的源代码并解压到文件系统中.
获取 antlibs-common 的来源并将内容解压到 ../ant-antlibs-props-master/common
运行 ant antlib 来构建 jar :

Get the sources of props antlib and unpack in filesystem.
Get the sources of antlibs-common and unpack contents to ../ant-antlibs-props-master/common
Run ant antlib for building the jar :

[jar] Building jar: c:\area51\ant-antlibs-props-master\build\lib\ant-props-1.0Alpha.jar

否则从 MVNRepository 获取二进制文件或这里

Otherwise get the binaries from MVNRepository or here

../antunit 很有帮助.对于嵌套属性，请查看 nested-测试.xml
将 ant-props.jar 放在 ant 类路径上.

The examples in ../antunit are quite helpful. For nested properties look in nested-test.xml
Put the ant-props.jar on ant classpath.

<project xmlns:props="antlib:org.apache.ant.props">

 <!-- Activate Props antlib -->
 <propertyhelper>
   <props:nested/>
 </propertyhelper>

 <property file="build.properties"/>

 <input message="Enter Location:" addproperty="loc" />      
 <input message="Enter Sandbox:" addproperty="box" />
 <property name="token" value="${${loc}.${box}.server}"/>

 <echo message="${token}"/>

</project>

输出:

Buildfile: c:\area51\ant\tryme.xml
    [input] Enter Location:
west
    [input] Enter Sandbox:
1
     [echo] TaPwxOsa

BUILD SUCCESSFUL
Total time: 4 seconds

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