java Ant 命令行参数
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Ant command line arguments
提问by kqualters
Program works fine when run with eclipse run configurations, but when run with ant, it is unable to parse int from args[0], which I do not understand. Full code is available here https://gist.github.com/4108950/e984a581d5e9de889eaf0c8faf0e57752e825a97I believe it has something to do with ant,
程序在使用 eclipse 运行配置运行时工作正常，但是当使用 ant 运行时，它无法从 args[0] 解析 int，我不明白。完整代码可在此处获得https://gist.github.com/4108950/e984a581d5e9de889eaf0c8faf0e57752e825a97我相信它与蚂蚁有关，
target name="run" description="run the project">
java dir="${build.dir}" classname="BinarySearchTree" fork="yes">
<arg value="6 in.txt"/>
/java>
/target>
the arg value will be changed via the -D flag, as in ant -Dargs="6 testData1.txt" run.
arg 值将通过 -D 标志更改，如 ant -Dargs="6 testData1.txt" 运行。
Any help would be much appreciated, it is very frustrating.
任何帮助将不胜感激，这非常令人沮丧。
回答by epoch
You need to supply the arguments as two different argvalues:
您需要将参数提供为两个不同的arg值：
<target name="run" description="run the project">
<java dir="${build.dir}" classname="BinarySearchTree" fork="yes">
<arg value="6" />
<arg value="in.txt" />
</java>
</target>
You can also use the lineattribute; From the ANTdocs:
您也可以使用该line属性；从ANT文档：
<arg value="-l -a"/>
is a single command-line argument containing a space character, not separate commands "-> l" and "-a".
是包含空格字符的单个命令行参数，而不是单独的命令“-> l”和“-a”。
<arg line="-l -a"/>
This is a command line with two separate arguments, "-l" and "-a".
这是一个带有两个独立参数“-l”和“-a”的命令行。
回答by Jayan
Expanding epoch 's answer.
扩展 epoch 的答案。
java task supports sysproperty and jvmarg.
java 任务支持 sysproperty 和 jvmarg。
For example (from ant java task page)
例如（来自 ant java 任务页面）
<java classname="test.Main" fork="yes" > <sysproperty key="DEBUG" value="true"/> <arg value="-h"/> <jvmarg value="-Xrunhprof:cpu=samples,file=log.txt,depth=3"/> </java>
<java classname="test.Main" fork="yes" > <sysproperty key="DEBUG" value="true"/> <arg value="-h"/> <jvmarg value="-Xrunhprof:cpu=samples,file=log.txt,depth=3"/> </java>
So you could construct the args from the command line passed to ant.
因此，您可以从传递给 ant 的命令行构造 args。
<target name="run" description="run the project">
<java dir="${build.dir}" classname="BinarySearchTree" fork="yes">
<sysproperty key="testarg" value="${testarg}"
<arg value="${arg1}" />
<arg value="${arg2}" />
</java>
</target>
Now if you call ant with ant -Dtestarg=test1234 -Darg1=6 -Darg2=in.txt, then testargwill be available via property. Others will become normal arguments to the java program.
现在，如果您使用 ant 调用ant -Dtestarg=test1234 -Darg1=6 -Darg2=in.txt，则testarg可以通过属性获得。其他的将成为 java 程序的正常参数。
