import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.Text;
import org.jdom2.input.SAXBuilder;
import org.jdom2.output.Format;
import org.jdom2.output.XMLOutputter;

import java.io.*;

public class Tester {

    public  static  void  main(String [] args) throws IOException {
        Element mkdir = new Element("mkdir");
        mkdir.setAttribute("dir","./classes");

        Element javac = new Element("javac");
        javac.setAttribute("srcdir", "./src");
        javac.setAttribute("destdir", "./classes");
        javac.setAttribute("includes", "**/*.java");

        Element echo = new Element("echo");
        echo.addContent(new Text("Build Complete!"));

        Element compile = new Element("target");
        compile.setAttribute("name","compile");
        compile.addContent(mkdir);
        compile.addContent(javac);

        Element project = new Element("project");
        project.setAttribute("default", "compile");
        project.addContent(compile);

        Document antbuild = new Document(project);
        //вывод
        XMLOutputter xout = new XMLOutputter(Format.getPrettyFormat());
        xout.output(antbuild, System.out);
    }
}

XPathFactory xpfac = XPathFactory.instance();
XPathExpression xp = xpfac.compile("//target/@name", Filters.attribute());
for (Attribute att : xp.evaluate(antbuild)) {
  System.out.println("We have target " + att.getValue());
}