Rest Clients

Rest Template

• Used to make REST API calls. Similar to Axios
• Imported from org.springframework.web.client.RestTemplate

ResponseEntity<String> responseEntity = new RestTemplate()
    .getForEntity(
      "http://localhost:8000/currency-exchange/from/{from}/to/{to}", String.class,
      uriVariables
    );
String response = responseEntity.getBody();

Feign

• Creates a proxy which is similar to a Dao

@FeignClient(name = "netflix-zuul-api-gateway-server")
@RibbonClient(name = "currency-exchange-service")
public interface CurrencyExchangeServiceProxy {
    // @GetMapping("/currency-exchange/from/{from}/to/{to}")
    @GetMapping("/currency-exchange-service/currency-exchange/from/{from}/to/{to}")
    public CurrencyConversionBean retrieveExchangeValue(@PathVariable("from") String from, @PathVariable("to") String to);
}

• The proxy is injected into the class and with that rest calls can be easily implemented