接口

public interface UserService {

    public  String getName();
}

提供者（接口實現類 controller）
先加上依賴 沒有這個依賴 接口和消者之間不能聯系

		 <dependency>
            <groupId>com.offcn</groupId>
            <artifactId>hello_interface</artifactId>
            <version>1.0</version>
        </dependency>

UserServiceImpl類
@Service
public class UserServiceImpl implements UserService {
    @Override
    public String getName() {
        return "張三";
    }
}
controller類
@RestController    //@Controller+@ResponseBody
public class UserController {

    @Autowired
    private UserService userService;

    @GetMapping("/getName")
    //@RequestMapping(value = "/getName",method = RequestMethod.GET)
    public String getName(){
        return userService.getName();
    }
}

運行結果：

消費者

接口實現類
@Service
public class UserServceImpl implements UserService {

    @Autowired
    private DiscoveryClient discoveryClient;//服務查詢工具

    @Autowired
    private  RestTemplate restTemplate;

     //http://localhost:8001/
    public String getServerInfo(){
        List<ServiceInstance> instanceList = discoveryClient.getInstances("HELLOPROVIDER");
        if (!CollectionUtils.isEmpty(instanceList)) {
            ServiceInstance serviceInstance = instanceList.get(0);
            String host = serviceInstance.getHost();
            int port = serviceInstance.getPort();
            return "http://"+host+":"+port;
        }
        return null;
    }


    @Override
    public String getName() {
        //遠程服務調用
        return restTemplate.getForObject(this.getServerInfo()+"/getName",String.class);
    }
}

controller類

@RestController
public class TestController {

    @Autowired
    private UserService userService;

    @RequestMapping("/print")
    public String print(){
        return userService.getName()+": 歡迎來到優就業學習！";
    }
}

運行結果：