/** * * @author king * * 查找类接口 */ public class ClassUtils { public static List<Class> getAllClassByInterface(Class c) {//按照接口字母顺序查找 List<Class> returnClassList = new ArrayList<Class>(); if (c.isInterface()) { String packageName = c.getPackage().getName(); try { try { List<Class> allClass = getClasses(packageName); for (int i = 0, len = allClass.size(); i < len; i++) { if (c.isAssignableFrom(allClass.get(i))) { if (!c.equals(allClass.get(i))) { returnClassList.add(allClass.get(i)); } } } } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return returnClassList; } private static List<Class> getClasses(String packageName) throws IOException, ClassNotFoundException { 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")) { classes.add(Class.forName(packageName + '.' + file.getName().substring(0, file.getName().length() - 6))); } } return classes; } }
反射机制——查找类接口
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转载自kingbinchow.iteye.com/blog/1807843
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