完整示例代码请参考：nacos-spring-discovery-example

一、下载 Nacos 并启动 Nacos server。参考：Nacos快速开始

二、添加坐标 可参考 mvnrepository

<dependency>
    <groupId>com.alibaba.nacos</groupId>
    <artifactId>nacos-spring-context</artifactId>
    <version>${latest.version}</version>
</dependency>

三、通过添加 @EnableNacosDiscovery 注解开启 Nacos Spring 的服务发现功能

@Configuration

@EnableNacosDiscovery(globalProperties = @NacosProperties(serverAddr = "127.0.0.1:8848"))

public class NacosConfiguration {

}

四、使用 @NacosInjected 注入 Nacos 的 NamingService 实例：

@Controller

@RequestMapping("discovery")

public class DiscoveryController {

    @NacosInjected

    private NamingService namingService;

    @RequestMapping(value = "/get", method = GET)

    @ResponseBody

    public List<Instance> get(@RequestParam String serviceName) throws NacosException {

        return namingService.getAllInstances(serviceName);

    }
}

五、启动 Tomcat，调用 curl http://localhost:8080/discovery/get?serviceName=example，此时返回为空 JSON 数组[]。

六、通过调用 Nacos Open API 向 Nacos server 注册一个名称为 example 服务。

curl -X PUT 'http://127.0.0.1:8848/nacos/v1/ns/instance?serviceName=example&ip=127.0.0.1&port=8080'

七、再次访问 curl http://localhost:8080/discovery/get?serviceName=example，此时返回内容为：

[
  {
    "instanceId": "127.0.0.1#8080#DEFAULT#example",
    "ip": "127.0.0.1",
    "port": 8080,
    "weight": 1.0,
    "healthy": true,
    "cluster": {
      "serviceName": null,
      "name": "",
      "healthChecker": {
        "type": "TCP"
      },
      "defaultPort": 80,
      "defaultCheckPort": 80,
      "useIPPort4Check": true,
      "metadata": {}
    },
    "service": null,
    "metadata": {}
  }
]