我试图在Spring MVC中验证我的字段，我尝试了几种方法，但都不起作用。
我以前
implementation("org.springframework.boot:spring-boot-starter-validation")，然后是implementation("javax.validation:validation-api:2.0.1.Final")
我给这些类做了注解

@Data
data class Taco(
    @NotBlank
    @Size(min = 5, message = "Name must be at least 5 characters long")
    var name: String = "",
    @NotEmpty
    @Size(min = 1, message = "You must choose at least one ingredient")
    var ingredient: MutableList<Ingredients> = mutableListOf()
)

准备控制器

@PostMapping
    fun processTaco(
        @Valid taco: Taco,
        bindingResult: BindingResult,
        @ModelAttribute tacoOrder: TacoOrder,
    ): String {
        //In case there are errors based on the data object validations, return to the design page.
        if (bindingResult.hasErrors()) return "design"
        tacoOrder.addTaco(taco)
        println("Processing Taco:$taco")
        return "redirect:/orders/current"
    }

并实现了该设计

<div>
        <h3>Name your taco creation:</h3>
        <input type="text" th:field="*{name}"/>
        <span class="invalid-feedback"
              th:if="${#fields.hasErrors('name')}"
              th:errors="*{name}">name Error</span>
        <br/>
        <button>Submit Your Taco</button>
    </div>

但无法根据条件验证单个字段...如何做到这一点？
此致