如何监听nacos，服务注册事件？

Nacos获取配置以及监听配置变更的基本使用方式如下：
public class NacosConfigExample {

public static void main(String[] args) throws NacosException, InterruptedException {
    String dataId = "test";
    String group = "DEFAULT_GROUP";
    Properties properties = new Properties();
    properties.put("namespace","test");
    properties.put("serverAddr", "192.168.153.101");

    //创建NacosConfigService的实例
    ConfigService configService = NacosFactory.createConfigService(properties);

    //获取配置内容
    String content = configService.getConfig(dataId, group, 5000);
    System.out.println("content:" + content);

    //添加监听器，监听配置的变更
    configService.addListener(dataId, group, new Listener() {
        @Override
        public void receiveConfigInfo(String configInfo) {
            //收到新的配置
            System.out.println("receive:" + configInfo);
        }

        @Override
        public Executor getExecutor() {
            return null;
        }
    });
}

}

参考文档： https://blog.51cto.com/u_16099234/10521147