@Valid working with @ModelAttribute, not with @RequestAttribute

问题

I'm implementing a @RestController and I realized that @Valid is working with @RequestBody or @ModelAttribute params of a @GetMapping method, but not with a @RequestAttribute parameter.

To get validated the @RequestAttribute annotated param I have to annotate my Controller class with @Validated.

Following my code:

Controller

@Log4j2
@RestController
@RequestMapping("/test/api/v1/entity")
public class MyController extends SomeController {

  @GetMapping("/getInfo")
  public ResponseEntity<<MyResponse>> infoStatus (RequestParam(required = false) String inputStr,
  @Valid @RequestAttribute ObjectToValidate objToValidate){
       //Any stuff here
  }
}

Bean to validate

@Getter
@Setter
@Valid 
public class ObjectToValidate {

  @NotNull
  @NotEmpty
  private String anyCode;
}

The result is anyCode is not checked to be not null nor empty. If I annotate MyController with @Validate, the ObjectToValidate param is validate as expected. If I change controller as follows, the validation also works.

    @Log4j2
    @RestController
    @RequestMapping("/test/api/v1/entity")
    public class MyController extends SomeController {

        @ModelAttribute 
        public ObjectToValidate addToModel(@RequestAttribute ObjectToValidate
        objToValidate) { return objToValidate; }

        @GetMapping("/getInfo")
        public ResponseEntity<MyResponse> infoStatus (
                @RequestParam(required = false) String inputStr,
                @Valid @ModelAttribute ObjectToValidate objToValidate
        ){
           //Any stuff here
        }
   }

Please, could you explain why?

回答1:

@Valid can be used on @RequestBody Controller Method Arguments. That is @RequestBody method argument can be annotated with @Valid to invoke automatic validation.

It will be no use if you annotate ObjectToValidate class with @Valid.

@PostMapping("/notes")
Note getNote(@Valid @RequestBody Note note) {
    return repository.save(note);
}

To validate the path variable, the controller class should be annotated with @Validated

@RestController
@Validated // class level
public class NoteController {

    @GetMapping("/note/{id}")
    Note findOne(@PathVariable @NotBlank(message = "Id must not be empty") String id) { 
        return repository.findById(id)
                .orElseThrow(() -> new NotekNotFoundException(id));
    }

}

Hope it helps!!

来源：https://stackoverflow.com/questions/61333008/valid-working-with-modelattribute-not-with-requestattribute

标签

spring-boot

validation

spring-mvc