Invoke ant from java, then return to java after ant termination

问题

so far i have invoked ant script from java. Now the question is, is it possible to resume java execution after the termination of the ant build?

How do i do it?

回答1:

org.apache.tools.ant.Main's main() and startAnt() methods call the exit() method which in turn calls System.exit(code).

The solution (assuming you call one of those methods) is to sub-class org.apache.tools.ant.Main and override the exit() method

/**
 * This operation is expected to call {@link System#exit(int)}, which
 * is what the base version does.
 * However, it is possible to do something else.
 * @param exitCode code to exit with
 */
protected void exit(int exitCode) {
    System.exit(exitCode);
}

回答2:

Check out the source of Ant's main class, org.apache.tools.ant.Main. You can try to invoke its main or start method directly, or copy some of its logic to your application. ~~After those methods finish, your application should continue execution.~~

EDIT:

The answer by Paul Cager is correct, I somehow missed the fact that Ant's Main calls System.exit().

Another thing about the main/start/startAnt methods is that they expect the arguments as an array of strings. This can be handy, but it's not particularly typesafe or object-oriented. To invoke Ant for a given buildfile and target, you can use something like this:

public static void runAnt(String buildfile, String target) throws Exception {
    File buildFile = new File(buildfile);
    Exception error = null;
    org.apache.tools.ant.Project project = new org.apache.tools.ant.Project();
    try {
        project.addBuildListener(new org.apache.tools.ant.listener.Log4jListener());
        project.fireBuildStarted();
        project.init();
        project.setUserProperty(org.apache.tools.ant.MagicNames.ANT_FILE, buildFile.getAbsolutePath());
        org.apache.tools.ant.ProjectHelper.configureProject(project, buildFile);
        project.executeTarget(target);
    } catch (Exception e) {
        error = e;
        throw e;
    } finally {
        project.fireBuildFinished(error);
    }
}

回答3:

Process p = Runtme.getRuntime.exec("ant mytarget");
p.waitFor();  // waits until process completes before continuing to next line
// continue Java program here

来源：https://stackoverflow.com/questions/8714262/invoke-ant-from-java-then-return-to-java-after-ant-termination

标签

java

ant