在 Spring Framework resttemplate 中将请求头内容类型设置为 json
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Setting request header content-type to json in Spring Framework resttemplate
提问by user2752012
I'm learning Spring Framework to create a client of a REST web service that uses basic authentication and exchanges JSON. After much searching on the web, I wrote some code that worked (below), but now I'm getting an "Unsupported Media Type" error because the requests are sent with Content-Type text/plain rather than application/json. I've found nothing on the web that shows how to set Content-Type in the request header (without getting completely lost in the weeds). My code is:
我正在学习 Spring Framework 来创建使用基本身份验证和交换 JSON 的 REST Web 服务的客户端。在网上进行了大量搜索之后，我编写了一些有效的代码（如下），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。我在网络上没有找到任何显示如何在请求标头中设置 Content-Type 的内容（没有完全迷失在杂草中）。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);
Any guidance would be greatly appreciated.
任何指导将不胜感激。
Thanks, George
谢谢，乔治
回答by ManojP
you can try using any method from below code
您可以尝试使用以下代码中的任何方法
1
1
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
HttpEntity<String> entity = new HttpEntity<String>(postBodyJson ,headers);
restTemplate.put(uRL, entity);
2
2
RequestEntity<String> requestEntity = RequestEntity .post(new URL(attributeLookupUrl).toURI()) .contentType(MediaType.APPLICATION_JSON) .body(postBodyJson);
restTemplate.exchange(requestEntity, responseClass);
3
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);
