英文:
Custom constraint validation annotation for MultipartFile
问题
我正在尝试创建一个注解来验证控制器参数上的MultipartFile列表，但似乎没有任何效果。没有抛出异常，没有任何错误。
我查看了一些类似的问题，但没有起作用。
-
接口:
@Target(ElementType.PARAMETER) @Retention(RetentionPolicy.RUNTIME) @Constraint(validatedBy = {ImageValidator.class}) public @interface ValidImage { String message() default "Invalid image file"; Class<?>[] groups() default {}; Class<? extends Payload>[] payload() default {}; } -
类:
public class ImageValidator implements ConstraintValidator<ValidImage, List<MultipartFile>> { @Override public boolean isValid( List<MultipartFile> listMultipartFile, ConstraintValidatorContext context) { for (var multipartFile : listMultipartFile) { var contentType = multipartFile.getContentType(); if (!isSupportedContentType(contentType)) { context.disableDefaultConstraintViolation(); context .buildConstraintViolationWithTemplate("Only JPG and PNG images are allowed.") .addConstraintViolation(); return false; } } return true; } private boolean isSupportedContentType(String contentType) { var supportedContents = List.of("image/jpg", "image/jpeg", "image/png"); return supportedContents.contains(contentType); } } -
使用:
@PostMapping(value = "images") public ResponseEntity<List<ExerciseImageDTO>> uploadImages( @RequestParam(value = "images", required = true) @ValidImage List<@Valid MultipartFile> images) { ....... return ResponseEntity.ok(createdImages); }
英文:
I'm trying to make an annotation to validate a list of MultipartFile on the controller parameters, but it doesn't seem to make any effect. No exception is thrown, not error at all.
I looked at some similar questions but it didn't work.
-
Interface:
@Target(ElementType.PARAMETER) @Retention(RetentionPolicy.RUNTIME) @Constraint(validatedBy = {ImageValidator.class}) public @interface ValidImage { String message() default "Invalid image file"; Class<?>[] groups() default {}; Class<? extends Payload>[] payload() default {}; } -
Class:
public class ImageValidator implements ConstraintValidator<ValidImage, List<MultipartFile>> { @Override public boolean isValid( List<MultipartFile> listMultipartFile, ConstraintValidatorContext context) { for (var multipartFile : listMultipartFile) { var contentType = multipartFile.getContentType(); if (!isSupportedContentType(contentType)) { context.disableDefaultConstraintViolation(); context .buildConstraintViolationWithTemplate("Only JPG and PNG images are allowed.") .addConstraintViolation(); return false; } } return true; } private boolean isSupportedContentType(String contentType) { var supportedContents = List.of("image/jpg", "image/jpeg", "image/png"); return supportedContents.contains(contentType); } } -
Usage:
@PostMapping(value = "images") public ResponseEntity<List<ExerciseImageDTO>> uploadImages( @RequestParam(value = "images", required = true) @ValidImage List<@Valid MultipartFile> images) { ....... return ResponseEntity.ok(createdImages); }
答案1
得分: 1
你的控制器类上需要添加@Validated，就像这样：
@Controller
@Validated
public class SampleController {
@PostMapping(value = "images")
public ResponseEntity<List<ExerciseImageDTO>> uploadImages(
@RequestParam(value = "images", required = true) @ValidImage List<@Valid MultipartFile> images) {
.......
return ResponseEntity.ok(createdImages);
}
}
英文:
you need @Validated on your controller class like this
@Controller
@Validated
public class SampleController {
@PostMapping(value = "images")
public ResponseEntity<List<ExerciseImageDTO>> uploadImages(
@RequestParam(value = "images", required = true) @ValidImage List<@Valid MultipartFile> images) {
.......
return ResponseEntity.ok(createdImages);
}
}
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论