Spring MVC：如何在ResponseEntity主体中返回不同的类型

这里有两个问题：

• 您的返回类型必须更改为匹配两个响应子类

  ResponseEntity<? extends AbstractResponse>

• 实例化ResponseEntity时，不能使用简化的<>语法，而必须指定要使用的响应类

  new ResponseEntity<ErrorResponse> (errResponse, HTTPStatus.BAD_REQUEST);

  @ResponseBody ResponseEntity<? extends AbstractResponse> createUser(@RequestBody String requestBody) {if(!valid(requestBody) {    ErrorResponse errResponse = new ErrorResponse();    //populate with error information    return new ResponseEntity<ErrorResponse> (errResponse, HTTPStatus.BAD_REQUEST);}createUser();CreateUserSuccessResponse successResponse = new CreateUserSuccessResponse();// populate with more inforeturn new ResponseEntity<CreateUserSuccessResponse> (successResponse, HTTPSatus.OK);

  }