获得java 包中所有class，java包中class,获得某个指定packag

获得java 包中所有class，java包中class,获得某个指定packag

获得某个指定package中的所有类：

/** * Scans all classes accessible from the context class loader which belong to the given package and subpackages. * * @param packageName The base package * @return The classes * @throws ClassNotFoundException * @throws IOException */private static Class[] getClasses(String packageName)        throws ClassNotFoundException, IOException {    ClassLoader classLoader = Thread.currentThread().getContextClassLoader();    assert classLoader != null;    String path = packageName.replace('.', '/');    Enumeration<URL> resources = classLoader.getResources(path);    List<File> dirs = new ArrayList<File>();    while (resources.hasMoreElements()) {        URL resource = resources.nextElement();        dirs.add(new File(resource.getFile()));    }    ArrayList<Class> classes = new ArrayList<Class>();    for (File directory : dirs) {        classes.addAll(findClasses(directory, packageName));    }    return classes.toArray(new Class[classes.size()]);}/** * Recursive method used to find all classes in a given directory and subdirs. * * @param directory   The base directory * @param packageName The package name for classes found inside the base directory * @return The classes * @throws ClassNotFoundException */private static List<Class> findClasses(File directory, String packageName) throws ClassNotFoundException {    List<Class> classes = new ArrayList<Class>();    if (!directory.exists()) {        return classes;    }    File[] files = directory.listFiles();    for (File file : files) {        if (file.isDirectory()) {            assert !file.getName().contains(".");            classes.addAll(findClasses(file, packageName + "." + file.getName()));        } else if (file.getName().endsWith(".class")) {            classes.add(Class.forName(packageName + '.' + file.getName().substring(0, file.getName().length() - 6)));        }    }    return classes;}