<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
</dependency>
@Constraint(validatedBy = EmailValidator.class)
@Target({ ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
public @interface ValidEmail {
String message() default "Invalid email";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
public class EmailValidator implements ConstraintValidator<ValidEmail, String> {
@Override
public void initialize(ValidEmail constraintAnnotation) {
}
@Override
public boolean isValid(String email, ConstraintValidatorContext context) {
}
}
public class User {
@ValidEmail
private String email;
}
@PostMapping("/users")
public ResponseEntity<String> createUser(@Valid @RequestBody User user) {
}
@ControllerAdvice
public class GlobalExceptionHandler {
@ExceptionHandler(MethodArgumentNotValidException.class)
public ResponseEntity<Map<String, String>> handleValidationException(MethodArgumentNotValidException ex) {
}
}
