RestClientException：SampleRequest没有HttpMessageConverter

Question

我是Sping引导的新手，我试图使用RestTemplate调用外部POST API，但得到错误，没有针对SampleRequest的HttpMessageConverter。

import com.SampleRequest;

@RestController
@RequestMapping(path = "/api")
public class TicketAgentController {

private static final Logger LOGGER = LogManager.getLogger(TicketAgentController);

@PostMapping(path = "/TicketAgent", consumes = "application/json", produces = "application/json")
public String createTroubleTicket(@RequestBody SampleRequest request) throws URISyntaxException {

    //Move to Common and service
    RestTemplate restTemplate = new RestTemplate();
    restTemplate.setMessageConverters(getMessageConverters());


    final String baseUrl = "http://172.100.5.89:8095/api/Ticket/v2";
    URI uri = new URI(baseUrl);

    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_JSON);

    LOGGER.info("Start ..");

    String result = restTemplate.postForObject(uri, request, String.class);

    LOGGER.info("Result :" + result);
    LOGGER.info("End ..");

    return result;

}

//Move to Common
private List<HttpMessageConverter<?>> getMessageConverters() {
    List<HttpMessageConverter<?>> converters = 
      new ArrayList<HttpMessageConverter<?>>();
    converters.add(new MappingJackson2HttpMessageConverter());
    return converters;
}

}

restClientException：在org.springframework.web.client.restTemplate$HttpEntityRequestCallback.dowithRequest(restTemplate.java:964)~[spring-web-5.2.2.release.jar:5.2.2.release]在org.springframework.web.client.restTemplate.doExecute(restTemplate.jave:740)~[spring-web-5.2.2.release.jar:5.2.2.release]在JAR:5.2.2.Release]在org.springframework.web.client.restTemplate.PostForObject(restTemplate.java:443)~[spring-web-5.2.2.release.jar:5.2.2.Release]

如果我需要提供更多的东西，请告诉我。

Answer 1

RestTemplate对您的对象SampleRequest及其序列化一无所知。我认为使用ObjectMapper最简单的方法是：

...
var headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
var entity = new HttpEntity<>(mapper.writeValueAsString(request), headers);
var result = restTemplate.postForObject(uri, entity, String.class);
...

您可以Autowire ObjectMapper映射器或创建新的映射器。