validation 校驗對象的屬性爲類

1. 問題描述：@NotNull 參數校驗失效

2. 代碼：

controller 接口
@PostMapping("/saveSpu")
public SHttpResponse<Boolean> saveSpu(@Valid @RequestBody ProductSaveDto productSaveDto) {
    SResponse<Boolean> re = productSpuService.saveSpu(productSaveDto);
    return SHttpResponse.transform(re);
}

對象
public class ProductSaveDto {

    @NotNull
    private ProductSpuEntity spuEntity;

    ...
}
public class ProductSpuEntity {

    @NotNull(message = "分類id不能爲空")
    private Integer categoryId;
    
}

3. 解決方法：在被校驗的屬性類上增長註解@Vail

修改後代碼
public class ProductSaveDto {

    @Valid
    @NotNull
    private ProductSpuEntity spuEntity;

    ...
}