如何让Ant识别项目文件夹中的文件？

Question

I am passing the file "testFile.txt" to my Java program as an argument using Eclipse and it works fine when I choose to run it normally. If I run the Ant build.xml in Eclipse with "testFile.txt" set as an argument, I get the error:

BUILD FAILED Target "testFile.txt" does not exist in the project "MyProj1".

If I use Ant and pass the file in a linux shell using the line:

ant -Dargs="testFile.txt" run

it passes the String value "testFile.txt" but can not find the the corresponding file. The file is in the MyProj1 folder which is where the src and build.xml are located. Do I need to move the .txt file or modify the build file? If I have to modify the build file, what do I need?

<target name="run" depends="compile" description="run the project">
    <java dir="${build.dir}" classname="${main.class}" fork="yes">
        <arg line="${args}"/>
    </java>
</target>

Answer 1

Add

<arg file="testFile.txt"/>

To the java task, ie:

<target name="run" depends="compile" description="run the project">
    <java dir="${build.dir}" classname="${main.class}" fork="yes">
        <arg line="${args}"/>
        <arg file="testFile.txt"/>
    </java>
</target>

This will create an absolute path to the /path/to/build.xml/directory, which is where your file is.

If your file is in a subdirectory, prepend that to the arg file value, ../ also works the way you'd expect.

edit:

Directory structure

c:\project
|
+---PassFileViaAnt.class
+---build.xml
+---foo.txt

Class:

public class PassFileViaAnt {
    public static void main( String[] args ) {
        for( String arg : args ) {
            System.out.println( arg );
        }
    }
}

task:

<target name="run" description="run the project">
    <java dir="${build.dir}" classname="PassFileViaAnt" fork="yes">
        <arg file="${args}" />
    </java>
</target>

Command:

c:\project> ant run -Dargs="foo.txt"

Output:

[java] C:\project\foo.txt

Command:

c:> ant -f c:\project\build.xml run -Dargs="foo.txt"

output

[java] C:\project\foo.txt