java动态加载插件化编程详解

时间:2021-04-03 人气:0

前言

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

/**
 * 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。

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