@Valid 与 @ModelAttribute 一起工作，而不是与 @RequestAttribute 一起工作 [英] @Valid working with @ModelAttribute, not with @RequestAttribute

问题描述

我正在实现一个 @RestController 并且我意识到 @Valid 正在使用 @RequestBody 或 @ModelAttribute @GetMapping 方法的参数，但不包含 @RequestAttribute 参数.

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.

要验证 @RequestAttribute 注释参数，我必须使用 @Validated 注释我的 Controller 类.

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

遵循我的代码:

1. 控制器

@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
  }
}

要验证的 Bean

Bean to validate

@Getter
@Setter
@Valid 
public class ObjectToValidate {

  @NotNull
  @NotEmpty
  private String anyCode;
}

结果是 anyCode 没有被检查为非 null 或空.如果我用 @Validate 注释 MyController，ObjectToValidate 参数会按预期验证.如果我按如下方式更改控制器，则验证也有效.

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
        }
   }

请你解释一下为什么?

推荐答案

@Valid 可用于@RequestBody 控制器方法参数.即@RequestBody 方法参数可以使用@Valid 进行注释以调用自动验证.

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

如果用@Valid 注释 ObjectToValidate 类将没有用.

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

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

要验证路径变量，控制器类应该用@Validated进行注释

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));
    }

}

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