CODEWITHSUNDEEP
javaspringmicroservicesresttemplate
Ke Vin
Ke Vin

Reputation: 3750

How to use RestTemplate to get result in List and put the response into List?

Hi what i trying to achieve is i want to consume other API and put some response data into List in my function using RestTemplate, here is how my code look like :

@PostMapping("/save-new")
public ResponseEntity<ShipmentAddressGrouping> saveNewShipmentAddressGrouping(@Valid @RequestBody InputRequest<ShipmentAddressGroupingDto> request) {
    String url = baseUrl + "/load-list";

    HttpEntity<PartnerShipmentDto> requestPartnerShipmentDto = new HttpEntity<>(new PartnerShipmentDto());
    RestTemplate restTemplate = new RestTemplate();
    List<PartnerShipmentDto> partnerShipmentDto = restTemplate.postForObject(url, requestPartnerShipmentDto, new ParameterizedTypeReference<List<PartnerShipmentDto>>() {});

    ShipmentAddressGrouping newShipmentAddressGrouping = shipmentAddressGroupingService.save(request);
    return ResponseEntity.ok(newShipmentAddressGrouping);

}

as you can see i try to get the response in to List, which is i try here restTemplate.postForObject(url, requestPartnerShipmentDto, new ParameterizedTypeReference<List<PartnerShipmentDto>>() {});

but i got error underlined in restTemplate.postForObject that look like this :

The method postForObject(String, Object, Class, Object...) in the type RestTemplate is not applicable for the arguments (String, HttpEntity, new ParameterizedTypeReference<List>(){})

What should i change to fix this?

Upvotes: 1

Views: 5578

Answers (2)

Beezer
Beezer

Reputation: 1108

I tried the above but it did not work for me. This works nicely in Kotlin:

  val uri = "http://localhost:$port/api/xxx/dosomething/"
  log.info("URL for Controller was: [$uri]") 
  val result: ResponseEntity<Array<BillingOrder>>
                = restTemplate!!.postForEntity(uri, ids, Array<BillingOrder>::class.java)
  assertNotNull(result)
  assertEquals(200, result.statusCodeValue)
  val body = result.body
  if (body != null) {
     body.forEach { order ->
       assertEquals("Success", order.billingState)
  } else {
    fail("Response body is null!")
  }

On a tangent, if you have a post that does NOT return a value but takes params, here is that one:

  uri = "http://localhost:$port/api/xxx/doSomething/${subscription.id}/"
  log.info("URL for Controller was: [$uri]")
  val x = restTemplate.postForEntity(uri, null, Void::class.java)
  assertNotNull(x)
  assertEquals(HttpStatus.SC_OK, x.statusCodeValue)

Upvotes: 0

Bernard
Bernard

Reputation: 375

If you want to use ParameterizedTypeReference<T>, you need to use RestTemplate.exchange(), since this is the only Method that exposes a parameter of type ParameterizedTypeReference<T>.

List<PartnerShipmentDto> partnerShipmentDto = restTemplate.exchange(url, 
                HttpMethod.GET, 
                requestPartnerShipmentDto,
                new ParameterizedTypeReference<List<PartnerShipmentDto>>() {})
        .getBody();

Upvotes: 3

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