Spring-boot HttpMediaTypeNotAcceptableException未被@ExceptionHandler在同一控制器中捕获

Question

在我的spring boot应用程序中，我有一个用于post请求的控制器，它生成和使用JSON请求，并且我为这个控制器定义了@ExceptionHandler，它使用HttpMediaTypeNotAcceptableException来捕获HttpMediaTypeNotAcceptableException(406状态代码）异常。

现在，每当我调用带有错误的ACCEPT头（如application/pdf）的post请求时，定义的异常就不会被调用。

@RestController
@RequestMapping("/school")
public class SchoolCotroller {

    @Autowired
    private SchoolService schoolService;

    @PostMapping(produces = "Application/Json", consumes = "Application/Json")
    @ResponseStatus(HttpStatus.CREATED)
    public School postData(@Valid @RequestBody School school)  {

       return  schoolService.save(school);

    }
 @ExceptionHandler(HttpMediaTypeNotAcceptableException.class)
    String handleMediaTypeNotAcceptable(
            final HttpMediaTypeNotAcceptableException exception,
            final NativeWebRequest request) {
        return "acceptable MIME type:" + MediaType.APPLICATION_JSON_VALUE;
        }
}

curl --location --request POST 'http://localhost:8080/school' \
--header 'Accept: application/pdf' \
--header 'Content-Type: application/json' \
--data-raw '{
    "studentName":"mayank",
    "course":1,
    "teacher":"e",
    "id":1
}' 

为什么它不调用所需的ExceptionHandler方法？

Answer 1

也许springboot在识别消费和产生类型为application/json时遇到了困难，因为您在endpoint将其提供为“application/json”。尝试以下代码：

@RestController
@RequestMapping("/school")
public class SchoolCotroller {

    @Autowired
    private SchoolService schoolService;

    @PostMapping(produces = MediaType.APPLICATION_JSON_VALUE , consumes = MediaType.APPLICATION_JSON_VALUE)
    @ResponseStatus(HttpStatus.CREATED)
    public School postData(@Valid @RequestBody School school)  {

       return  schoolService.save(school);

    }

    @ExceptionHandler(HttpMediaTypeNotAcceptableException.class)
    @ResponseStatus(HttpStatus.NOT_ACCEPTABLE)
    String handleMediaTypeNotAcceptable(
            final HttpMediaTypeNotAcceptableException exception,
            final HttpServletRequest request) {
        return "acceptable MIME type:" + MediaType.APPLICATION_JSON_VALUE;
    }
}