在Spring Framework resttemplate中将请求标头内容类型设置为json

Question

我正在学习Spring Framework来创建一个REST Web服务的客户端，该服务使用基本身份验证并交换JSON。经过网上搜索，我编写了一些有用的代码（下图），但现在我收到了“不支持的媒体类型”错误，因为请求是使用Content-Type text / plain而不是application / json发送的。我在网上找不到任何显示如何在请求标题中设置Content-Type的内容（不会在杂草中完全丢失）。我的代码是：

import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.HttpClient;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.client.HttpClientBuilder;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;

...

BasicCredentialsProvider credentialsProvider = new BasicCredentialsProvider();
credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials("login", "password"));
HttpClient httpClient = HttpClientBuilder.create().setDefaultCredentialsProvider(credentialsProvider).build();
ClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory(httpClient);

RestTemplate restTemplate = new RestTemplate(requestFactory);
String url = "http://host:8080/path/";
String postBody = getPostInput("filename");
jsonString = restTemplate.postForObject(path, postBody, String.class);

非常感谢任何指导。

谢谢， 乔治

Answer 1

您可以尝试使用以下代码中的任何方法

<强> 1

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

HttpEntity<String> entity = new HttpEntity<String>(postBodyJson ,headers);
restTemplate.put(uRL, entity);

<强> 2

RequestEntity<String> requestEntity = RequestEntity .post(new URL(attributeLookupUrl).toURI()) .contentType(MediaType.APPLICATION_JSON) .body(postBodyJson); 
restTemplate.exchange(requestEntity, responseClass);

第3

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

// if you need to pass form parameters in request with headers.
MultiValueMap<String, String> map = new LinkedMultiValueMap<>();
map.add("username", userName);
map.add("password", password);

HttpEntity<MultiValueMap<String, String>> request = new HttpEntity<>(map, headers);
ResponseEntity<TokenVO> responses = restTemplate.postForEntity(URL, request, responseClass);