java动态加载插件化编程详解

/** * Created by shengjk1 on 2017/12/11 */public class PluginManager {  private final static Logger logger = LoggerFactory.getLogger(SendMessageFactory.class);  private URLClassLoader urlClassLoader;  public PluginManager(List<Plugin> plugins) throws MalformedURLException {    init(plugins);  }  //将所有插件动态加载至JVM中  private void init(List<Plugin> plugins) throws MalformedURLException {    int size = plugins.size();    URL[] urls = new URL[size];    for (int i = 0; i < size; i++) {      Plugin plugin = plugins.get(i);      String filePath = plugin.getJar();      urls[i] = new URL("file:" + filePath);    }    urlClassLoader = new URLClassLoader(urls);  }  public PluginService getInstance(String className) throws ClassNotFoundException, InstantiationException, IllegalAccessException {    // 插件实例化对象，得到每一个插件具体的对象    Class<?> clazz = urlClassLoader.loadClass(className);    Object instance = clazz.newInstance();    return (PluginService) instance;  }}