如何优雅的使用进行参数校验

在spring里面有一个注解  @Validated

可以在方法的入参里面这样写

//方法
getActivityFlag(@RequestBody @Validated QueryActivityDto queryActivityDto) //参数详情@NotBlank(message = "userId不能为空")private String userId;@NotNull(message = "storeId不能为空")private String storeId;@NotBlank(message = "festivalId不能为空")private String festivalId;

然后进行报错拦截即可，拦截方式有多种

1、直接在切面进行拦截

实现如下方法

private static Validator validator = Validation.byProvider(HibernateValidator.class).configure().failFast(true).buildValidatorFactory().getValidator();/*** @param object object* @param groups groups*/
public static void validateObject(Object object, Class<?>... groups) throws ValidationException {Set<ConstraintViolation<Object>> constraintViolations = validator.validate(object, groups);if (constraintViolations.stream().findFirst().isPresent()) {throw new ValidationException(constraintViolations.stream().findFirst().get().getMessage());}
}

2、进行自定义异常处理

ExceptionHandler(VvipException.class)
public ResultMsg handleException(VvipException e) {// 打印错误信息StackTraceElement s = e.getStackTrace()[0];log.error("msg:【{}】,file:【{}】,line:【{}】,method:【{}】", e.getMessage(), s.getFileName(), s.getLineNumber(), s.getMethodName());return ResultMsg.error(e.getErrorCode().getValue(), e.getMessage());
}private static String getParamErrorMsg(BindingResult bind) {String[] str = Objects.requireNonNull(bind.getAllErrors().get(0).getCodes())[1].split("\\.");String message = bind.getAllErrors().get(0).getDefaultMessage();String msg1 = "不能为空";String msg2 = "不能为null";String msg3 = "must not be null";String msg4 = "must not be empty";if (msg1.equals(message)|| msg2.equals(message)|| msg3.equals(message)|| msg4.equals(message)) {message = ArrayUtil.join(ArrayUtil.remove(str, 0), ".") + ":" + message;}return message;
}

3、还有一种就是在参数后面加一个 BindingResult对象（不推荐 耦合度太高）

findMemberByUnionid(@RequestBody @Validated QueryMemberByUnionidDto queryMemberDto, BindingResult result) {if(result.hasErrors()){result.getFieldErrors().forEach((item)->{log.error("参数错误:{}",item.getDefaultMessage());});}