Json 如何在返回对象的 Spring MVC @RestController @ResponseBody 类中响应 HTTP 状态代码

我正在try 使用@RestController，它以@PathVariable返回JSON格式的特定对象，以及正确的状态代码.到目前为止，代码将以JSON格式返回对象，因为默认情况下，它使用的是Jackson库中内置的Spring 4.

However I do not know how to make it so it will give a message to the user saying we want an api variable, then JSON data, then Error code (Or success code depending if all went well). Example output would be:

请输入api值作为参数(注意，如果需要，也可以使用JSON)

{"id":2，"api":"3000105000"…}(注意这将是JSON响应对象)

Status Code 400 (OR proper status code)

The url with parameter look like this

http://localhost:8080/gotech/api/v1/api/3000105000

到目前为止，我掌握的代码如下:

@RestController
@RequestMapping(value = "/api/v1")
public class ClientFetchWellDataController {

    @Autowired
    private OngardWellService ongardWellService;

    @RequestMapping(value = "/wells/{apiValue}", method = RequestMethod.GET)
    @ResponseBody
    public OngardWell fetchWellData(@PathVariable String apiValue){
        try{
            OngardWell ongardWell = new OngardWell();
            ongardWell = ongardWellService.fetchOneByApi(apiValue);
    
            return ongardWell;
        }catch(Exception ex){
            String errorMessage;
            errorMessage = ex + " <== error";
            return null;
        }
    }
}