springboot手动触发参数校验，service层调用参数校验

背景

入参校验一般是在控制层通过javax.validation.constraints包下的规则注解如NotNull结合Valid与Validated实现，但是有时候我们的方法不提供给controller调用，这时候就无法触发自动参数校验，为此我们可以在不更改校验代码的前提下手动触发spring的参数校验。

代码实现

• 触发工具类

import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.ValidationException;
import javax.validation.Validator;
import java.util.List;
import java.util.Set;/*** @description validator参数校验类*/
public class ValidateUtil {private static final Validator VALIDATOR = Validation.buildDefaultValidatorFactory().getValidator();/*** 校验实体类* @param t  参数* @param notNull t是否可以为空*/public static <T> void validate(T t, boolean notNull) {if (t == null) {if (notNull) {throw new ValidationException("参数不能为空");}return;}Set<ConstraintViolation<T>> constraintViolations = VALIDATOR.validate(t);if (constraintViolations.size() < 1) {return;}for (ConstraintViolation<T> constraintViolation : constraintViolations) {throw new ValidationException(constraintViolation.getMessage());}}public static <T> void validate(T t) {validate(t, false);}public static <T> void validate(List<T> list) {validate(list, false);}/*** @description: 参数校验* @date 11:59 2024/6/7* @param list* @param notNull list是否可以为空**/public static <T> void validate(List<T> list, boolean notNull) {if (list == null || list.isEmpty()) {if (notNull) {throw new ValidationException("参数不能为空");}return;}list.forEach(item -> {Set<ConstraintViolation<T>> constraintViolations = VALIDATOR.validate(item);if (constraintViolations.size() < 1) {return;}for (ConstraintViolation<T> constraintViolation : constraintViolations) {throw new ValidationException(constraintViolation.getMessage());}});}/*** 通过组来校验实体类* @param t 参数* @param notNull t是否可以为空* @param groups 校验组*/public static <T> void validate(T t, boolean notNull, Class<?>... groups) {if (t == null) {if (notNull) {throw new ValidationException("参数不能为空");}return;}Set<ConstraintViolation<T>> constraintViolations = VALIDATOR.validate(t, groups);if (constraintViolations.size() < 1) {return;}for (ConstraintViolation<T> constraintViolation : constraintViolations) {throw new ValidationException(constraintViolation.getMessage());}}public static <T> void validate(T t, Class<?>... groups) {validate(t, false, groups);}
}

• 使用

// 方法入参
public class RefundOrderParam {@ApiModelProperty(value = "总退款金额", required = true)@NotNull(message = "总退款金额不能为空", groups = {InsertGroup.class, UpdateGroup.class})private BigDecimal totalRefundMoney;@ApiModelProperty(value = "是否原路退", required = true)@NotNull(message = "是否原路退不能为空", groups = {InsertGroup.class, UpdateGroup.class})private Boolean originalRefund;
}
//触发校验
ValidateUtil.validate(request, UpdateGroup.class);