How to use Eureka client in RestTemplate

Question

I have the following code:

import org.springframework.web.client.RestTemplate;

private final RestTemplate restTemplate;

public RestTemplate getRestTemplate() {
    return restTemplate;
}


ResponseEntity<Response> response = restTemplate.exchange("http://127.0.0.1:8080/users", HttpMethod.POST, request, Response.class);


I get:

java.lang.IllegalArgumentException: Illegal character in scheme name at index 0: 127.0.0.1:

How I can use Eureka in order to get a Eureka client and make a call using the name of the remote microservice registered into Eureka.

Answer 1

Solution

The general usage of RestTemplate coinside with Eurekacode snippet is following

@SpringBootApplication
@EnableEurekaClient
@RestController
public class EurekaRestTemplateExampleApplication {

    public static void main(String[] args) {
        SpringApplication.run(EurekaRestTemplateExampleApplication.class, args);
    }

    @Bean
    @LoadBalanced
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }

    @GetMapping("/")
    public String callOtherService() {
        RestTemplate restTemplate = restTemplate();
        ResponseEntity<String> response = restTemplate.exchange("http://eureka-client-service/api/endpoint", HttpMethod.GET, null, String.class);
        return "Response from other service: " + response.getBody();
    }
}

By the way , before configure RestTempalte you d better make sure that both Eureka client and server side has been configure correctly

Recommendation

Specified Ip or service name in microService with restTemplate is not recommended . because of it is too coupling , I will show your a http client request componment Fegin

1.Define a Fegin interface

The interface reference is based on Server Provider side , just type method maintain consistency with provider side

@FeignClient("eureka-client-service")
public interface MyFeignClient {

    @GetMapping("/api/endpoint")
    String getEndpointData();
}

2.Make a Request

The rest of all is same as RestTemplate , but the usage is more compact and convenient

@RestController
public class MyController {

    private final MyFeignClient feignClient;

    @Autowired
    public MyController(MyFeignClient feignClient) {
        this.feignClient = feignClient;
    }

    @GetMapping("/")
    public String callOtherService() {
        return "Response from other service: " + feignClient.getEndpointData();
    }
}

Appendix

If you build project in maven , you can add following dependency

    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-openfeign</artifactId>
        <version>${yourFegin.version}</version>
    </dependency>