Is it possible to call Ant or NSIS scripts from Java code?

Question

Is it possible to call Ant or NSIS scripts programmatically from Java code at runtime? If so, how?

Answer 1

You can call ant scripts from Java code.

See this article (scroll down to the "Running Ant via Java" section) and this article:

   File buildFile = new File("build.xml");
   Project p = new Project();
   p.setUserProperty("ant.file", buildFile.getAbsolutePath());
   p.init();
   ProjectHelper helper = ProjectHelper.getProjectHelper();
   p.addReference("ant.projectHelper", helper);
   helper.parse(p, buildFile);
   p.executeTarget(p.getDefaultTarget());

Update

I tried with the following ant file , it did not "tell" anything (no console output), but it worked: the file was indeed moved

   <project name="testproject" default="test" basedir=".">
      <target name="test">
        <move file="test.txt" tofile="test2.txt" />
      </target>
   </project>

And when I try it again (when there is no test.txt to move(it is already moved)), I got an java.io.FileNotFoundException.

I think this is what you would expect when you run something from Java.

If you want the console output of the ant tasks, you might want to add a Logger as a build listener.

From @Perception's answer below.

   DefaultLogger consoleLogger = new DefaultLogger();
   consoleLogger.setErrorPrintStream(System.err);
   consoleLogger.setOutputPrintStream(System.out);
   consoleLogger.setMessageOutputLevel(Project.MSG_INFO);
   p.addBuildListener(consoleLogger);

Answer 2

Too expand on Nivas' answer - his solution is correct, you are not seeing output from your program because you haven't attached any loggers to your project.

DefaultLogger consoleLogger = new DefaultLogger();
consoleLogger.setErrorPrintStream(System.err);
consoleLogger.setOutputPrintStream(System.out);
consoleLogger.setMessageOutputLevel(Project.MSG_INFO);
p.addBuildListener(consoleLogger);

This is just basic setup, theres alot more you can do with the Ant Java API.