<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>

@Data
@Accessors(chain = true)
@TableName("user")
@Validated
public class User {
    private Integer id;
    @NotBlank(message = "姓名不能為空")
    private  String name;
    @Min(message = "年齡不正確1-100之間",value = 1)
    @Max(message = "年齡不正確1-100之間",value = 1)

    private  Integer age ;
    private Integer sex;

}

@Target({ElementType.ANNOTATION_TYPE, ElementType.METHOD, ElementType.FIELD})
@Retention(RUNTIME)
@Documented
@Constraint(validatedBy = ListNotHaveNullValidatorImpl.class)//此處指定了注解的實(shí)現(xiàn)類
public @interface ListNotHaveNull {
    /**
     * 添加value屬性，可以作為校驗(yàn)時(shí)的條件,若不需要，可去掉此處定義
     */
    int value() default 0;
    String message() default "List集合中不能含有null元素";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
    /**
     * 定義List，為了讓Bean的一個(gè)屬性上可以添加多套規(guī)則
     */
    @Target({METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER})
    @Retention(RUNTIME)
    @Documented
    @interface List {
        ListNotHaveNull[] value();
    }
}

@Service
public class ListNotHaveNullValidatorImpl implements ConstraintValidator<ListNotHaveNull, List> {
    private int value;
    @Override
    public void initialize(ListNotHaveNull constraintAnnotation) {
        //傳入value 值，可以在校驗(yàn)中使用
        this.value = constraintAnnotation.value();
    }
    public boolean isValid(List list, ConstraintValidatorContext constraintValidatorContext) {
        for (Object object : list) {
            if (object == null) {
                //如果List集合中含有Null元素，校驗(yàn)失敗
                return false;
            } else if (object instanceof String) {
                String value = object.toString();
                if (value.trim().length() == 0){
                    return false;
                }
            }
        }
        return true;
    }
}

@Data
public class SysRole {

    private Long roleId;

    @NotBlank(message = "角色名不能為空")
    private String name;

    @NotEmpty(message = "資源列表不能為空")
    @ListNotHaveNull(message = "List 中不能含有null元素")
    @Valid
    private List<String> paths;

}

    @PostMapping("/addRole")
    public R addRole(@RequestBody @Valid SysRole sysRole) {
        System.out.println("走到這里說(shuō)明校驗(yàn)成功");
        System.out.println(sysRole);
        return R.ok(R.SUCCESS_MSG);
    }

public class ValidatorUtils {
    private ValidatorUtils() { }

    private static Validator validator;
    static {
        validator = Validation.buildDefaultValidatorFactory().getValidator();
    }

    /**
     * 校驗(yàn)對(duì)象
     *
     * @param object 待校驗(yàn)對(duì)象
     * @param groups 待校驗(yàn)的組
     * @throws RRException 校驗(yàn)不通過(guò)，則報(bào)RRException異常
     */
    public static void validateEntity(Object object, Class<?>... groups) throws RRException {
        Set<ConstraintViolation<Object>> constraintViolations = validator.validate(object, groups);

        if (!constraintViolations.isEmpty()) {
            Iterator<ConstraintViolation<Object>> iterator = constraintViolations.iterator();
            StringBuilder msg = new StringBuilder();
            while (iterator.hasNext()) {
                ConstraintViolation<Object> constraint = iterator.next();
                msg.append(constraint.getMessage()).append(',');
            }
            throw new RRException(msg.toString().substring(0,msg.toString().lastIndexOf(',')));
        }
    }
}

@RestControllerAdvice
public class GlobalExceptionHandler {
    @ExceptionHandler(value = MethodArgumentNotValidException.class)
    @ResponseBody
    public Result MethodArgumentNotValidExceptionHandler(MethodArgumentNotValidException e)
    {
        //獲取實(shí)體類定義的校驗(yàn)注解字段上的message作為異常信息，@NotBlank(message = "用戶密碼不能為空！")異常信息即為"用戶密碼不能為空！"
        List<ObjectError> allErrors = e.getBindingResult().getAllErrors();
        String message = allErrors.stream().map(s -> s.getDefaultMessage()).collect(Collectors.joining(";"));
        List<String> msgList = new ArrayList<>();
        msgList = Arrays.asList(message.split(";"));
        return Result.failed(msgList.get(0));
    }
}

    @ExceptionHandler({ConstraintViolationException.class})
    @ResponseBody
    public Result handleConstraintViolationException(ConstraintViolationException ex) {
        return Result.failed(ex.getMessage());
    }