Kotlin Spring Boot Webflux使用@Valid注释验证@RequestBody

import org.springframework.web.bind.annotation.PostMapping
import org.springframework.web.bind.annotation.RequestBody
import org.springframework.web.bind.annotation.RestController
import javax.validation.Valid
import javax.validation.constraints.Size

@RestController
class UserController {

    @PostMapping("/users")
    fun createUser(@Valid @RequestBody user: User): String {
        return "User created successfully"
    }
}

data class User(
    @field:Size(min = 2, max = 30)
    val name: String,
    @field:Size(min = 6, max = 50)
    val password: String
)

import org.springframework.http.HttpStatus
import org.springframework.http.ResponseEntity
import org.springframework.web.bind.MethodArgumentNotValidException
import org.springframework.web.bind.annotation.ControllerAdvice
import org.springframework.web.bind.annotation.ExceptionHandler

@ControllerAdvice
class GlobalExceptionHandler {

    @ExceptionHandler(MethodArgumentNotValidException::class)
    fun handleValidationExceptions(ex: MethodArgumentNotValidException): ResponseEntity<Map<String, String>> {
        val errors = mutableMapOf<String, String>()
        ex.bindingResult.allErrors.forEach { error ->
            val fieldName = (error.source as? FieldError)?.field
            val errorMessage = error.defaultMessage
            errors[fieldName] = errorMessage ?: "Invalid field"
        }
        return ResponseEntity.badRequest().body(errors)
    }
}