无法推断响应实体的类型参数

Question

我想实现Spring endpoint，在其中我可以返回XML对象< code > notification echo response 和http状态代码。我试过这个:

@PostMapping(value = "/v1/notification", produces = "application/xml")
  public ResponseEntity<?> handleNotifications(@RequestParam MultiValueMap<String, Object> keyValuePairs) {

   if (!tnx_sirnature.equals(signature)) 
     {
         return new ResponseEntity<>("Please contact technical support!", HttpStatus.INTERNAL_SERVER_ERROR);
     }         

    return new ResponseEntity<>(new NotificationEchoResponse(unique_id), HttpStatus.OK);
  }

但是我收到错误：无法推断响应实体的类型参数




Answer 1

ResponseEntity的返回类型应为< code >

或者您可以简单地执行响应实体

Answer 2

public ResponseEntity<BasicCreateUpdateResponse> deleteProductPrefix(@RequestBody ProductPrefixEntity inputFields) {
    if(inputFields.getRecid().isEmpty()) {
        throw new ApplicationException(NPIConstants.ERR_500, HttpStatus.OK, null, null);
    }
    logger.info("Inside resources updateProduct method() .........");
    return new ResponseEntity<>(productPrefixService.deleteProductPrefix(inputFields),HttpStatus.OK);
}

在此代码中，“productprefixservice . deleteproductprefix(input fields)”的返回类型必须是ResponseEntity。

Answer 3

您可以使用

    ResponseEntity<Object> 

就像那样

运筹学

您可以创建自己的自定义类，如ResponseData，并在该类中放置一个字段，如paylod

  public class ResponseData {
      private Object payload;
   } 

并像ResponseEntity那样使用并设置该值。

现在你的控制器会是这个样子

    @PostMapping(value = "/v1/notification", produces = "application/xml")
    public ResponseEntity<ResponseData> handleNotifications(@RequestParam 
    MultiValueMap<String, Object> keyValuePairs) {

   if (!tnx_sirnature.equals(signature)) 
   {
     return new ResponseEntity<ResponseData>(new ResponseData("Please contact to technical support"), 
    HttpStatus.INTERNAL_SERVER_ERROR);
   }         

   return new ResponseEntity<ResponseData>(new ResponseData(new NotificationEchoResponse(unique_id)), 
   HttpStatus.OK);
   }

您也可以将响应数据替换为 Object ，然后

  @PostMapping(value = "/v1/notification", produces = "application/xml")
    public ResponseEntity<Object> handleNotifications(@RequestParam 
    MultiValueMap<String, Object> keyValuePairs) {

   if (!tnx_sirnature.equals(signature)) 
   {
     return new ResponseEntity<Object>("Please contact to technical support", 
    HttpStatus.INTERNAL_SERVER_ERROR);
   }         

   return new ResponseEntity<Object>(new NotificationEchoResponse(unique_id), 
   HttpStatus.OK);
   }