Passing command line arguments to Java via ant build script

问题

On running the following command:

ant targetname -Dk1=v1 -Dk2=v2

I want the command line parameters passed down to java, like java whatever -Dk1=v1 -Dk2=v2.

I need to access these parameters from Java code with System.getProperty or System.getenv.

What do I need to write in my ant build script to make this happen?

Or should I take some other approach altogether?

回答1:

I'm not sure exactly how you want to pass these values, but there are several mechanisms:

Use <sysproperty> to pass system properties you need to set:
Use <arg> to pass command line arguments to your Java class
Use <jvmarg> to pass arguments to your Java command itself
If you fork your Java task, you can also set environment variables too. These are ignored if you don't fork the Java task

This:

 $ foo=bar; java -Xlingc com.example.foo.bar -Dsys1=fu -Dsys2=barfu -arg1 -arg2 bar

Becomes:

<java classname="com.example.foo.bar"
    fork="true">
    <env key="foo" value="bar"/>
    <sysproperty key="sys1" value="fu"/>
    <sysproperty key="sys2" value="barfu"/>
    <jvmarg value="-Xlingc"/>
    <arg value="-arg1"/>
    <arg value="-arg2"/>
    <arg value="bar"/>
</java>

Hope that example helps

回答2:

Not good in Ant Script but I do something like below :

<target name="execute">
    <echo> Running MyClass ......... </echo>
    <java classname="pkg.MyClass" classpathref="libs">          
        <arg value="val1" /> <!-- command line args -->
        <arg value="val2" />
        <arg value="val3" />
        <env key="k1" value="v1" /> <!-- set environmental value -->
    </java>     
</target>

If you are using Eclipse, you will get suggestions in popup under java tag. I got few more like : <sysproperty/>, <syspropertyset></syspropertyset>, <jvmarg/>

回答3:

Use the nested <arg> elements in your <java> task:

<java classname="test.Main">
     <arg value="${k1}"/>
     <arg value="${k2}"/>
     <classpath>
       <pathelement location="dist/test.jar"/>
       <pathelement path="${java.class.path}"/>
     </classpath>
   </java>

来源：https://stackoverflow.com/questions/14237329/passing-command-line-arguments-to-java-via-ant-build-script

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java

ant

command-line-arguments