Jak ustawić nagłówek "Accept:" na żądaniu Spring RestTemplate?

Możesz ustawić interceptor "ClientHttpRequestInterceptor" w RestTemplate, aby uniknąć ustawiania nagłówka za każdym razem, gdy wysyłasz zapytanie.

public class HeaderRequestInterceptor implements ClientHttpRequestInterceptor {

        private final String headerName;

        private final String headerValue;

        public HeaderRequestInterceptor(String headerName, String headerValue) {
            this.headerName = headerName;
            this.headerValue = headerValue;
        }

        @Override
        public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException {
            request.getHeaders().set(headerName, headerValue);
            return execution.execute(request, body);
        }
    }

Then

List<ClientHttpRequestInterceptor> interceptors = new ArrayList<ClientHttpRequestInterceptor>();
interceptors.add(new HeaderRequestInterceptor("Accept", MediaType.APPLICATION_JSON_VALUE));

RestTemplate restTemplate = new RestTemplate();
restTemplate.setInterceptors(interceptors);

Jeśli, podobnie jak ja, starałeś się znaleźć przykład, który używa nagłówków z podstawowym uwierzytelnieniem i API rest template exchange, to jest to, co w końcu wymyśliłem...

private HttpHeaders createHttpHeaders(String user, String password)
{
    String notEncoded = user + ":" + password;
    String encodedAuth = Base64.getEncoder().encodeToString(notEncoded.getBytes());
    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_JSON);
    headers.add("Authorization", "Basic " + encodedAuth);
    return headers;
}

private void doYourThing() 
{
    String theUrl = "http://blah.blah.com:8080/rest/api/blah";
    RestTemplate restTemplate = new RestTemplate();
    try {
        HttpHeaders headers = createHttpHeaders("fred","1234");
        HttpEntity<String> entity = new HttpEntity<String>("parameters", headers);
        ResponseEntity<String> response = restTemplate.exchange(theUrl, HttpMethod.GET, entity, String.class);
        System.out.println("Result - status ("+ response.getStatusCode() + ") has body: " + response.hasBody());
    }
    catch (Exception eek) {
        System.out.println("** Exception: "+ eek.getMessage());
    }
}

Oto prosta odpowiedź. Mam nadzieję, że to komuś pomoże.

import org.springframework.boot.devtools.remote.client.HttpHeaderInterceptor;
import org.springframework.http.MediaType;
import org.springframework.http.client.ClientHttpRequestInterceptor;
import org.springframework.web.client.RestTemplate;


public String post(SomeRequest someRequest) {
    // create a list the headers 
    List<ClientHttpRequestInterceptor> interceptors = new ArrayList<>();
    interceptors.add(new HttpHeaderInterceptor("Accept", MediaType.APPLICATION_JSON_VALUE));
    interceptors.add(new HttpHeaderInterceptor("ContentType", MediaType.APPLICATION_JSON_VALUE));
    interceptors.add(new HttpHeaderInterceptor("username", "user123"));
    interceptors.add(new HttpHeaderInterceptor("customHeader1", "c1"));
    interceptors.add(new HttpHeaderInterceptor("customHeader2", "c2"));
    // initialize RestTemplate
    RestTemplate restTemplate = new RestTemplate();
    // set header interceptors here
    restTemplate.setInterceptors(interceptors);
    // post the request. The response should be JSON string
    String response = restTemplate.postForObject(Url, someRequest, String.class);
    return response;
}

Kod: wywołanie rest api za pomocą szablonu

1)

       RestTemplate restTemplate = new RestTemplate();
        // Add the Jackson message converter
        restTemplate.getMessageConverters().add(new 
           MappingJackson2HttpMessageConverter());

        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON);
        headers.set("Authorization", "Basic XXXXXXXXXXXXXXXX=");
        HttpEntity<String> entity = new HttpEntity<String>("parameters", headers);

        restTemplate.getInterceptors().add(new BasicAuthorizationInterceptor(USERID, PWORD));

        String requestJson = getRequetJson(Code, emailAddr, firstName, lastName);
        //
        response = restTemplate.postForObject(URL, requestJson, MYObject.class);

Lub

2)

    RestTemplate restTemplate = new RestTemplate();
    String requestJson = getRequetJson(code, emil, name, lastName);

    //
    HttpHeaders headers = new HttpHeaders();
    String userPass = USERID + ":" + PWORD;
    String authHeaderValue = "Basic " + Base64.getEncoder().encodeToString(userPass.getBytes());
    headers.set(HttpHeaders.AUTHORIZATION, authHeaderValue);
    headers.setContentType(MediaType.APPLICATION_JSON);
    headers.setAccept(Collections.singletonList(MediaType.APPLICATION_JSON));
    HttpEntity<String> request = new HttpEntity<String>(requestJson, headers);
    //
    ResponseEntity<MyObject> responseEntity =this.restTemplate.exchange(URI, HttpMethod.POST, request, MyObject.class);

    responseEntity.getBody()

Metoda tworzenia obiektu json

    private String getRequetJson(String Code, String emailAddr, String firstName, String lastName) {
        ObjectMapper mapper = new ObjectMapper();
        JsonNode rootNode = mapper.createObjectNode();

        ((ObjectNode) rootNode).put("code", Code);
        ((ObjectNode) rootNode).put("email", emailAdd);
        ((ObjectNode) rootNode).put("firstName", firstname);
        ((ObjectNode) rootNode).put("lastName", lastname);

        String jsonString = null;
        try {
            jsonString = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(rootNode);
        } catch (JsonProcessingException e) {

            e.printStackTrace();
        }
        return jsonString;

    }