[英]Reading Ant variables from multiple properties files
I have an Ant buildfile that imports the following at the top of the file: 我有一个Ant构建文件,它在文件顶部导入以下内容:
<project name="..." ...>
<property file="build.properties"/>
...
In the project root I have two properties files: build.properties
and special-config.properties
. 在项目根目录中,我有两个属性文件:
build.properties
和special-config.properties
。 I am defining a target that needs to read the following property out of special-config.properties
: 我正在定义一个需要从
special-config.properties
读取以下属性的目标:
always.ask=true
always.ask =真
So the target needs to be something like this (just keep in mind that build.properties
was already set as the property file long before this target ever executes): 所以目标必须是这样的 (只是要记住,
build.properties
已经被设置为属性文件这一目标不断执行长前):
<target name="exec-special-logic">
<!-- Somehow read special-config.properties#always.ask and set it to a local variable... -->
</target>
But I am ansure of how to load this 2nd property file and make its properties (such as always.ask
) available to Ant. 但我想知道如何加载第二个属性文件并使其属性(如
always.ask
)可用于Ant。 Thanks in advance. 提前致谢。
You can read properties from as many different files as you like, so you could have 您可以根据需要从多个不同的文件中读取属性,这样您就可以拥有
<property file="build.properties"/>
<property file="build.properties.part2"/>
And so on. 等等。 In Ant the first value set for a property sticks - properties are quietly immutable.
在Ant中,属性的第一个值集 - 属性是悄然不可变的。 Hence if you have:
因此,如果你有:
<property name="my.prop" value="one" />
somewhere in the first file and 在第一个文件中的某个地方
<property name="my.prop" value="two" />
later - perhaps in the second file, the property will have the value "one" for the duration of the build. 稍后 - 也许在第二个文件中,属性在构建期间将具有值“1”。
A feature of recent versions is that properties can be localised to an execution block - this lets you "get around" the immutability. 最新版本的一个特性是属性可以本地化到执行块 - 这可以让你“绕过”不变性。 Here's an example lifted straight from the docs for the Ant local task :
这是一个直接从Ant 本地任务的文档中提取的示例:
<property name="foo" value="foo"/>
<target name="step1">
<echo>Before local: foo is ${foo}</echo>
<local name="foo"/>
<property name="foo" value="bar"/>
<echo>After local: foo is ${foo}</echo>
</target>
<target name="step2" depends="step1">
<echo>In step2: foo is ${foo}</echo>
</target>
outputs 输出
step1:
[echo] Before local: foo is foo
[echo] After local: foo is bar
step2:
[echo] In step2: foo is foo
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