如何从Java任务设置Java库路径？ [英] How do I set the Java library path from a Java task?

问题描述

是否可以在java任务中指定库路径？类似于：

Is it possible to specify a library path in a java task? Like the equivalent of:

java -Djava.library.path=somedir Whatever

推荐答案

< propertyset> ; 和< syspropertyset> 应该是你要找的东西

<propertyset> and <syspropertyset> should be what you are looking for

另见此主题。

您可以在java ant任务中逐个设置它们：

You can set them one by one within your java ant task:

<sysproperty key="test.classes.dir" 
             value="${build.classes.dir}"/> 

乏味......或者你可以将它们作为一组Ant属性传递下去：

tedious... or you can pass them down as a block of Ant properties:

<syspropertyset> 
    <propertyref prefix="test."/> 
</syspropertyset> 

您可以参考外部系统属性：

You can reference external system properties:

<propertyset id="proxy.settings"> 
    <propertyref prefix="http."/> 
    <propertyref prefix="https."/> 
    <propertyref prefix="socks."/> 
</propertyset> 

然后在你的java ant任务中使用它们：这个属性集可以按需使用;传递给新进程时，传递与给定前缀匹配的所有当前ant属性：

and then use them within your java ant task: This propertyset can be used on demand; when passed down to a new process, all current ant properties that match the given prefixes are passed down:

<java>
     <!--copy all proxy settings from the running JVM--> 
     <syspropertyset refid="proxy.settings"/> 
     ...
</java>

---

我完全错过了你试图通过的事实 java.library.path property！

如此主题：

---

I completely missed the fact you were trying to pass java.library.path property!
As mentioned in this thread:

如果您尝试设置它在java任务之外的值，Ant忽略它。所以我把除了那个之外的所有属性放在我的syspropertyset中，它按预期工作。

if you try to set its value outside of the java task, Ant ignores it. So I put all properties except for that one in my syspropertyset and it works as expected.

含义：

<property name="java.library.path" location="${dist}"/>

<propertyset id="java.props">
    <propertyref name="java.library.path"/>
</propertyset>

<target name="debug">
    <java>
        <syspropertyset refid="java.props"/>
    </java>
</target>

不起作用，但以下应该是：

will not work, but the following should:

<target name="debug">
    <java>
        <sysproperty key="java.library.path" path="${dist}"/>
    </java>
</target>

（尽管您可以尝试使用 fork 如果不起作用，属性设置为true

（注意：你无法修改其值）

(although you might try that with the "fork" attribute set to true if it does not work)
(Note: you cannot modify its value though)

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