Nacos提供配置订阅者即监听者查询的能力,同时提供客户端当前配置的MD5校验值,以便帮助用户更好地检查配置变更是否推送到Client端

1.编写监听代码

package com.leo.nacos;

import com.alibaba.nacos.api.NacosFactory;
import com.alibaba.nacos.api.config.ConfigService;
import com.alibaba.nacos.api.config.listener.Listener;
import com.alibaba.nacos.api.exception.NacosException;

import java.util.Properties;
import java.util.concurrent.Executor;

public class SimpleDemoMain {
    public static void main(String[] args) throws NacosException, InterruptedException {
        // 使用nacos client 远程获取nacos服务上的配置信息

        // nacos 地址
        String serverAddr = "127.0.0.1:8848";
        // Data Id
        String dataId = "nacos-simple-demo.yaml";
        // Group
        String group = "DEFAULT_GROUP";
        // Namespace
        String namespace = "0c74cab7-f503-4fa8-af6d-25a5b65f598c";

        Properties properties = new Properties();
        properties.put("serverAddr", serverAddr);
        properties.put("namespace", namespace);
        // 获取配置
        ConfigService configService = NacosFactory.createConfigService(properties);
        String config = configService.getConfig(dataId, group, 5000);
        System.out.println(config);

        configService.addListener(dataId, group, new Listener() {
            @Override
            public Executor getExecutor() {
                return null;
            }

           // 当配置有变化时获取通知
            @Override
            public void receiveConfigInfo(String s) {
                System.out.println(s);
            }
        });

        while(true) {
            Thread.sleep(2000);
        }
    }
}

Nacos监听查询_开发语言

2. 执行程序

Nacos监听查询_f5_02 

3. 查询监听

Nacos监听查询_nacos_03 

4.修改配置文件

Nacos监听查询_nacos_04 

5.查看效果

Nacos监听查询_java_05