Javaでこのインタフェースを実装するすべてのサブクラスを取得する方法

public static List<Class> getAllClassByInterface(Class c) {
		//     
		List<Class> returnClassList = new ArrayList<Class>();
		//         ，     
		if (c.isInterface()) {
			//        
			String packageName = c.getPackage().getName();
			try {
				//                
				List<Class> allClass = getClasses(packageName);
				//           
				for (int i = 0; i < allClass.size(); i++) {
					//          
					if (c.isAssignableFrom(allClass.get(i))) {
						//       
						if (!c.equals(allClass.get(i))) {
							returnClassList.add(allClass.get(i));
						}
					}
				}
			} catch (ClassNotFoundException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			}

		}
		return returnClassList;
	}

	//             ， jar      
	private static List<Class> getClasses(String packageName)
			throws ClassNotFoundException, IOException {
		ClassLoader classLoader = Thread.currentThread()
				.getContextClassLoader();
		//  '/'  '.'  
		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;
	}

	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")) {
				//   '.class'
				classes.add(Class.forName(packageName
						+ '.'
						+ file.getName().substring(0,
								file.getName().length() - 6)));

			}
		}
		return classes;
	}
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