java自定义ClassLoader加载指定的class文件实现例子

			SyncExternalClassLoader loader = new SyncExternalClassLoader();
			Class<?> aClass = loader.findClass("bug");
			object = aClass.newInstance();

　　

public class SyncExternalClassLoader extends ClassLoader {

	@Override
	public Class<?> findClass(String name) {
		String myPath = "file:///D:/infosec/netauth/accountsync/SynchAccountToCertAuth.class";
		System.out.println(myPath);
		byte[] cLassBytes = null;
		Path path = null;
		try {
			path = Paths.get(new URI(myPath));
			cLassBytes = Files.readAllBytes(path);
		} catch (IOException | URISyntaxException e) {
			e.printStackTrace();
		}
		Class clazz = defineClass("infosec.netauth.accountsync.SynchAccountToCertAuth", cLassBytes, 0, cLassBytes.length);
		return clazz;
	}
}

　　

boolean interfaceFlag = guessInterface(object);

　　

	private boolean guessInterface(Object object) {
		if (object instanceof SynchAccountApi) {
			return true;
		}
		if (object instanceof SyncUsersFromAppInterface) {
			return true;
		}
		Class<?>[] allInterfaces = ClassUtils.getAllInterfaces(object);
		return Arrays.stream(allInterfaces).anyMatch(aClass -> aClass.getName().contains("SynchAccountApi"));
	}

　　

	private List<PropertiesBean> getPropertiesBean(){
		SyncExternalClassLoader loader = new SyncExternalClassLoader();
		Class<?> aClass = loader.findClass("bug");
		Object object;
		try {
			object = aClass.newInstance();
			Method method = aClass.getMethod("getProperties");
			List<PropertiesBean> list = (List<PropertiesBean>) method.invoke(object);
			return list;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}