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spring - GET 请求在 Postman 中有效，但不适用于 RestTemplate - SpringBoot

问题描述

当我尝试通过邮递员发送时，我有一个工作正常的请求。我试图使用遇到错误的代码来实现相同的功能。

我正在使用的代码 -

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

MultiValueMap<String, String> map= new LinkedMultiValueMap<String, String>();
map.add("client_id", clientid);
map.add("client_secret",clientsecret);

HttpEntity<?> request = new HttpEntity<>(map, headers);
logger.info(request.toString());

UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl(access_token_url)
                    .queryParam("grant_type", "client_credentials");

logger.info("URI -" + builder.toUriString());

ResponseEntity<String> response = restTemplate.exchange(builder.build().encode().toUri(), 
   HttpMethod.GET, request, String.class);
logger.info("Response" + response.getBody());

我得到的错误是 -

org.springframework.web.client.HttpClientErrorException$Unauthorized: 401 未经授权

但是在 POSTMAN 中同样的工作具有相同的细节。

我想指定的东西

我主要担心的是我从未见过任何地方发送带有方法主体的 GET 请求，但它在 POSTMAN 中工作，如果它在那里工作，为什么不在代码中工作？我哪里错了？

编辑 - 1 被标记为重复，但它总体上是一个不同的错误代码。OP 得到了500 Internal Server Error因为他提供了错误的内容类型。

编辑 - 2 调试输出 -

2019-07-31 14:53:05.208 DEBUG 3576 --- [nio-8080-exec-1] o.s.web.client.RestTemplate              : HTTP GET ORIGINAL_URL?grant_type=client_credentials
2019-07-31 14:53:05.215 DEBUG 3576 --- [nio-8080-exec-1] o.s.web.client.RestTemplate              : Accept=[text/plain, application/json, application/*+json, */*]
2019-07-31 14:53:05.218 DEBUG 3576 --- [nio-8080-exec-1] o.s.web.client.RestTemplate              : Writing [{client_id=[CLIENTID], client_secret=[CLIENT_SECRET]}] as "application/x-www-form-urlencoded"
2019-07-31 14:53:06.976 DEBUG 3576 --- [nio-8080-exec-1] o.s.web.client.RestTemplate              : Response 401 UNAUTHORIZED
2019-07-31 14:53:07.034 DEBUG 3576 --- [nio-8080-exec-1] m.m.a.RequestResponseBodyMethodProcessor : Using 'text/html', given [text/html, application/xhtml+xml, image/webp, image/apng, application/signed-exchange;v=b3, application/xml;q=0.9, */*;q=0.8] and supported [text/plain, */*, text/plain, */*, application/json, application/*+json, application/json, application/*+json]
2019-07-31 14:53:07.035 DEBUG 3576 --- [nio-8080-exec-1] m.m.a.RequestResponseBodyMethodProcessor : Nothing to write: null body
2019-07-31 14:53:07.039 DEBUG 3576 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Completed 200 OK
2019-07-31 14:53:07.108 DEBUG 3576 --- [io-8080-exec-10] o.s.web.servlet.DispatcherServlet        : GET "/favicon.ico", parameters={}
2019-07-31 14:53:07.119 DEBUG 3576 --- [io-8080-exec-10] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped to ResourceHttpRequestHandler [class path resource [META-INF/resources/], class path resource [resources/], class path resource [static/], class path resource [public/], ServletContext resource [/], class path resource []]
2019-07-31 14:53:07.181 DEBUG 3576 --- [io-8080-exec-10] o.s.web.servlet.DispatcherServlet        : Completed 200 OK

标签： springspring-bootresttemplate

解决方案

对于相同的用例，我们使用以下实现。

RestTemplate restTemplate = new RestTemplate();
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
headers.set("Accept", MediaType.APPLICATION_JSON_VALUE);
String token = new String(Base64.getEncoder().encode((clientId + ":" + clientSecret).getBytes()));
headers.add("Authorization", "Basic " + token);
HttpEntity<?> request = new HttpEntity<>(headers);
logger.info(request.toString());
UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl(access_token_url).queryParam("grant_type", "client_credentials");
logger.info("URI -" + builder.toUriString());
ResponseEntity<String> response = restTemplate.exchange(builder.build().encode().toUri(), HttpMethod.POST,request, String.class);
logger.info("Response" + response.getBody());

这可能会帮助你。

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