Java 使用 Ant 运行带有命令行参数的程序
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Use Ant for running program with command line arguments
提问by Victoria Seniuk
My program getting command line arguments. How can I pass it when I use Ant?
我的程序获取命令行参数。我在使用 Ant 时如何通过它？
采纳答案by emory
Extending Richard Cook's answer.
扩展Richard Cook的回答。
Here's the anttask to run any program (including, but not limited to Java programs):
这是ant运行任何程序（包括但不限于 Java 程序）的任务：
<target name="run">
<exec executable="name-of-executable">
<arg value="${arg0}"/>
<arg value="${arg1}"/>
</exec>
</target>
Here's the task to run a Java program from a .jarfile:
下面是从.jar文件运行 Java 程序的任务：
<target name="run-java">
<java jar="path for jar">
<arg value="${arg0}"/>
<arg value="${arg1}"/>
</java>
</target>
You can invoke either from the command line like this:
您可以像这样从命令行调用：
ant -Darg0=Hello -Darg1=World run
Make sure to use the -Dargsyntax; if you ran this:
确保使用-Darg语法；如果你运行这个：
ant run arg0 arg1
then antwould try to run targets arg0and arg1.
然后ant将尝试运行目标arg0和arg1.
回答by Richard Cook
Can you be a bit more specific about what you're trying to do and how you're trying to do it?
您能否更具体地说明您正在尝试做什么以及如何尝试？
If you're attempting to invoke the program using the <exec>task you might do the following:
如果您尝试使用该<exec>任务调用程序，您可以执行以下操作：
<exec executable="name-of-executable">
<arg value="arg0"/>
<arg value="arg1"/>
</exec>
回答by Mark O'Connor
The only effective mechanism for passing parameters into a build is to use Java properties:
将参数传递到构建中的唯一有效机制是使用 Java 属性：
ant -Done=1 -Dtwo=2
The following example demonstrates how you can check and ensure the expected parameters have been passed into the script
以下示例演示了如何检查并确保已将预期参数传递到脚本中
<project name="check" default="build">
<condition property="params.set">
<and>
<isset property="one"/>
<isset property="two"/>
</and>
</condition>
<target name="check">
<fail unless="params.set">
Must specify the parameters: one, two
</fail>
</target>
<target name="build" depends="check">
<echo>
one = ${one}
two = ${two}
</echo>
</target>
</project>
回答by ofavre
If you do not want to handle separate properties for each possible argument, I suggest you'd use:
如果您不想为每个可能的参数处理单独的属性，我建议您使用：
<arg line="${args}"/>
You can check if the property is not set using a specific target with an unlessattribute and inside do:
您可以检查是否未使用具有unless属性的特定目标设置该属性，并在内部执行：
<input message="Type the desired command line arguments:" addProperty="args"/>
Putting it all together gives:
把它们放在一起给出：
<target name="run" depends="compile, input-runargs" description="run the project">
<!-- You can use exec here, depending on your needs -->
<java classname="Main">
<arg line="${args}"/>
</java>
</target>
<target name="input-runargs" unless="args" description="prompts for command line arguments if necessary">
<input addProperty="args" message="Type the desired command line arguments:"/>
</target>
You can use it as follows:
您可以按如下方式使用它：
ant
ant run
ant run -Dargs='--help'
The first two commands will prompt for the command-line arguments, whereas the latter won't.
前两个命令将提示输入命令行参数，而后者则不会。
回答by Hugh Perkins
What I did in the end is make a batch file to extract the CLASSPATH from the ant file, then run java directly using this:
我最后做的是制作一个批处理文件从ant文件中提取CLASSPATH，然后使用这个直接运行java：
In my build.xml:
在我的 build.xml 中：
<target name="printclasspath">
<pathconvert property="classpathProp" refid="project.class.path"/>
<echo>${classpathProp}</echo>
</target>
In another script called 'run.sh':
在另一个名为“run.sh”的脚本中：
export CLASSPATH=$(ant -q printclasspath | grep echo | cut -d \ -f 7):build
java "$@"
It's no longer cross-platform, but at least it's relatively easy to use, and one could provide a .bat file that does the same as the run.sh. It's a very short batch script. It's not like migrating the entire build to platform-specific batch files.
它不再是跨平台的，但至少它相对易于使用，并且可以提供一个与 run.sh 相同的 .bat 文件。这是一个非常短的批处理脚本。这不像将整个构建迁移到特定于平台的批处理文件。
I think it's a shame there's not some option in ant whereby you could do something like:
我认为很遗憾在 ant 中没有一些选项可以让您执行以下操作：
ant -- arg1 arg2 arg3
mpirun uses this type of syntax; ssh also can use this syntax I think.
mpirun 使用这种类型的语法；我认为 ssh 也可以使用这种语法。
