如何将请求数据从 Spring MVC 控制器传送到 Spring RestTemplate

Question

我有一个 Spring MVC 应用程序，它接受来自 UI（多格式和 json）的请求，它必须使用 Spring RestTemplate 将此数据发布到另一个微服务。将请求作为字符串复制到 RestTemplate 在 json 内容类型的情况下工作正常，但在多部分的情况下似乎不起作用。

这是我的示例代码

Spring MVC 控制器：

@Controller
public class MvcController {

  @RequestMapping(value = "/api/microservice",  method = RequestMethod.POST)
  public ResponseEntity<?> callMicroservice(HttpServletRequest request) throws Exception {
      RestTemplate rest = new RestTemplate();
      String payload = IOUtils.toString(request.getReader());
      HttpHeaders headers = new HttpHeaders();
      headers.add("Content-Type", request.getHeader("Content-Type"));
      HttpEntity<String> requestEntity = new HttpEntity<String>(payload, headers);
      return rest.exchange("https://remote.micrservice.com/api/backendservice", HttpMethod.POST, requestEntity, String.class);    
  }
}

这里是后端微服务的样子

@Controller
public class RestController {

  @RequestMapping(value = "/api/backendservice",  method = RequestMethod.POST)
  public @ResponseBody Object createService(@RequestParam(value = "jsondata") String jsondata,
        @RequestParam(value = "email") String email,@RequestParam(value = "xsltFile", required = false) MultipartFile xsltFile,
        HttpServletRequest request) {
      // process jsondata
      // process xsltFile
      // send response
  }
}

如果您查看 MvcController，我将有效负载作为字符串发送

String payload = IOUtils.toString(request.getReader());

相反，我怎样才能将请求数据按原样发送到 RestTemplate 请求，以便它适用于字符串和多部分。如果您查看 MvcController 签名，我不知道用户会发送哪些详细信息，有时我不知道什么是微服务签名。我只需要在 MvcController 和 RestTemplate 请求之间传递数据。

Answer 1

@RequestMapping(value = "/api/microservice",  method = RequestMethod.POST)
  public ResponseEntity<?> callMicroservice(HttpServletRequest request) throws Exception {
      RestTemplate rest = new RestTemplate();
        LinkedMultiValueMap<String, Object> map = new LinkedMultiValueMap<>();
        map.add("jsondata", yourjsondata);
        map.add("email", youremail);
        map.add("xsltFile", new ClassPathResource(file));
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.MULTIPART_FORM_DATA);

        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);

}