[JAVA] Individuare le classi in un package tramite Reflection

[Mich24]

ciao a tutti,

qualcuno sa se è possibile trovare le classi che ci sono in un package al run-time (usando la Reflection?)

Grazie!

[Mich24]

se qualcuno dovesse avere la stessa necessità ho trovato questo metodo:

 /**
   * list Classes inside a given package
   * @author Jon Peck http://jonpeck.com (adapted from http://www.javaworld.com/javaworld/j...avatip113.html)
   * @param pckgname String name of a Package, EG "java.lang"
   * @return Class[] classes inside the root of the given package
   * @throws ClassNotFoundException if the Package is invalid
   */

  public static Class[] getClasses(String pckgname) throws
    ClassNotFoundException {
    ArrayList classes = new ArrayList();
    // Get a File object for the package
    File directory = null;
    try {
      directory = new File(Thread.currentThread().getContextClassLoader().
                           getResource('/'+pckgname.replace('.', '/')).getFile());
    } catch(NullPointerException x) {
      throw new ClassNotFoundException(pckgname+
                                       " does not appear to be a valid package");
    }
    if(directory.exists()) {
      // Get the list of the files contained in the package
      String[] files = directory.list();
      for(int i = 0; i<files.length; i++) {
        // we are only interested in .class files
        if(files[i].endsWith(".class")) {
          // removes the .class extension
          classes.add(Class.forName(pckgname+'.'+
                                    files[i].substring(0, files[i].length()-6)));
        }
      }
    } else {
      throw new ClassNotFoundException(pckgname+
                                       " does not appear to be a valid package");
    }
    Class[] classesA = new Class[classes.size()];
    classes.toArray(classesA);
    return classesA;
  }