我正在尝试使用 RestTemplate 调用第三方服务。但是当我尝试通过 Java 代码调用该服务时，它会抛出 BadRequest 错误。 由于我无法弄清楚如何为 API 构建 Resttemplate，因此我在这里请求有关如何为此类请求构建请求正文的建议，请也查看我现有的代码并帮助我找出以下错误代码。
How the Postman Request looks like:
以下是在 Postman 中形成的代码片段：
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url("")
.post(null)
.addHeader("Authorization", "************")
.addHeader("User-Agent", "PostmanRuntime/7.13.0")
.addHeader("Accept", "*/*")
.addHeader("Cache-Control", "no-cache")
.addHeader("Postman-Token", "**********")
.addHeader("Host", "**************")
.addHeader("accept-encoding", "gzip, deflate")
.addHeader("content-length", "160200")
.addHeader("Connection", "keep-alive")
.addHeader("cache-control", "no-cache")
.build();
Response response = client.newCall(request).execute();
// 其中文件的类型为文件
LinkedMultiValueMap<String, Object> map = new LinkedMultiValueMap<>();
map.add("file", new ClassPathResource(file));
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.TEXT_PLAIN);
HttpEntity<LinkedMultiValueMap<String, Object>> requestEntity = new
HttpEntity<LinkedMultiValueMap<String, Object>>(
map, headers);
ResponseEntity<String> result = template.get().exchange(
contextPath.get() + path, HttpMethod.POST, requestEntity,
String.class);
我想成功调用第三方实体并获得响应。
Use ResponseEntity with byte[]类型和无内容类型：
InputStream inputStream = new ClassPathResource("myFile.jpg").getInputStream();
byte[] data = IOUtils.toByteArray(inputStream);
HttpEntity<byte[]> requestEntity = new HttpEntity<>(data);
restTemplate.exchange("url", HttpMethod.POST, requestEntity , String.class);