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?相当于:

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 应该是你要找的

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

例如，另请参见此主题.

你可以在你的java ant任务中一一设置:

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

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

乏味...或者您可以将它们作为 Ant 属性块传递:

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

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

您可以引用外部系统属性:

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propertyset可以按需使用；当向下传递到一个新进程时，所有当前匹配给定前缀的 ant 属性都会向下传递:

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>

<小时>

我完全错过了您试图传递 java.library.path 属性的事实！
如本主题所述:

如果您尝试在 java 任务之外设置它的值，Ant 会忽略它.所以我把除了那个属性之外的所有属性都放在我的 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>

不会工作，但以下应该:

will not work, but the following should:

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

(尽管您可以尝试将fork"属性设置为 true，如果它不起作用)
(注意:您虽然不能修改其值)

(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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