对于java程序员来说，插件化是一件很酷的功能，小二有幸在工作中实现了此功能。
背景：
需要将mysql的数据通过canal同步至kafka/mysql/hdfs等
实现 直接上代码
/**
* 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; } }
然后就可以进行插件的调用了。 有一点需要注意，那就是效率。反射真的降低效率吗？请移步