我怎么可以遍历从文件属性？ [英] How can I iterate over properties from a file?

问题描述

我所有的项目和它们的版本在一个属性文件中定义是这样的：

All my projects and their versions are defined in a properties file like this:

ProjectNameA=0.0.1
ProjectNameB=1.4.2

我想遍历所有的项目，并在Ant脚本中使用他们的名字和版本。

I'd like to iterate over all the projects, and use their names and versions in an Ant script.

在present我读使用属性任务的整个文件，然后遍历一个给定的列表中进行这样的循环：

At present I read the entire file using the property task, then iterate over a given list in a for loop like this:

<for list="ProjectNameA,ProjectNameB" param="project">
   <sequential>
    <echo message="@{project} has version ${@{project}}" />
   </sequential>
</for>

我怎样才能避免项目名称的硬编码在for循环？
基本上遍历各行，因为我去提取名称和项目的版本。

How can I avoid the hard-coding of the project names in the for loop? Basically iterate over each line and extract the name and the version of a project as I go.

推荐答案

看到你已经在使用antcontrib 为，怎么样利用的<一个href=\"http://ant-contrib.sourceforge.net/tasks/tasks/propertyselector.html\"><$c$c>propertyselector任务：

Seeing as you're already using antcontrib for, how about making use of the propertyselector task:

<property file="properties.txt" prefix="projects."/>
<propertyselector property="projects" match="projects\.(.*)" select="\1"/>

<property file="properties.txt" />
<for list="${projects}" param="project">
    ...
</for>

这里的想法是与项目 preFIX曾经读过的属性，并使用所产生的属性集，建设项目用逗号分隔的列表在 propertyselector 任务。然后，属性是重读的没有的的preFIX，让您的for循环可以像以前一样继续进行。

The idea here is to read the properties once with the projects prefix, and use the resulting set of properties to build a comma-separated list of projects with the propertyselector task. Then the properties are re-read without the prefix, so that your for loop can proceed as before.

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