Possible to pass raw JSON to a Rest API using the Spring RestTemplate?

Question

Is it possible to pass raw JSON to a Rest API using the Spring RestTemplate?

I am attempting the following:

List<HttpMessageConverter<?>> httpMessageConverters = new ArrayList<HttpMessageConverter<?>>();
httpMessageConverters.add(new MappingJacksonHttpMessageConverter());
restTemplate.setMessageConverters(httpMessageConverters);
String jsonText = // raw JSON
httpHeaders.setContentType(MediaType.APPLICATION_JSON);
HttpEntity<?> entity = new HttpEntity<Object>(jsonText, httpHeaders);
restTemplate.exchange(url, HttpMethod.POST, entity, responseClass);

When I invoke this request, I get a HTTP 400 error response, meaning bad request. However, all headers and the JSON body are identical as that submitted using a HTTP client I have.

In contrast, the following works fine when I create the MyRequest object and set it on the HttpEntity:

List<HttpMessageConverter<?>> httpMessageConverters = new ArrayList<HttpMessageConverter<?>>();
    httpMessageConverters.add(new MappingJacksonHttpMessageConverter());
    restTemplate.setMessageConverters(httpMessageConverters);
    MyRequest myRequest = new MyRequest();
    httpHeaders.setContentType(MediaType.APPLICATION_JSON);
    HttpEntity<?> entity = new HttpEntity<Object>(myRequest, httpHeaders);
    restTemplate.exchange(url, HttpMethod.POST, entity, responseClass);

Therefore, I am wondering how I can invoke my REST API using raw JSON in String format?

Have you tried not setting the message converters, since you don't want your message to be converted to anything? Also, why not make it a HttpEntity<String>? — JB Nizet

Felipe Bravo Felipe Bravo · Accepted Answer · 2016-04-06T13:49:51

This is Method

            String url = String.format("https://SITE");
            RestTemplate template = new RestTemplate();
            template.getMessageConverters().add(new StringHttpMessageConverter());

            String valor ="{\"cmd\":\"123\", \"includeImei\":\"true\"}";

            HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_JSON);
            headers.set("Authenticate", "TOKEN");


            HttpEntity<String> entity = new HttpEntity<String>(valor, headers);
            URI valoresdevueltos = template.postForLocation(url, entity);

Possible to pass raw JSON to a Rest API using the Spring RestTemplate?

1 Answers