自定义校验

接口：

@Target({ElementType.METHOD, ElementType.FIELD, ElementType.ANNOTATION_TYPE, ElementType.CONSTRUCTOR, ElementType.PARAMETER, ElementType.TYPE_USE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Constraint(validatedBy = {CannotBlankValidation.class})
public interface CannotBlank{
    //默认错误信息
    String message() default "不能包含空格";

    Class<?>[] groups() default {};

    Class<? extends Payload>[] payload() default {};

    @Target({ElementType.METHOD, ElementType.FIELD, ElementType.ANNOTATION_TYPE, ElementType.CONSTRUCTOR, ElementType.PARAMETER, ElementType.TYPE_USE})
    @Retention(RetentionPolicy.RUNTIME)
    @Documented
    public @interface List {
        CannotBlank[] value();
    }
}

实现类：

public class CannotBlankValidation implements ConstraintValidator<CannotBlank,String> {
    @Override
    public boolean isValid(String value, ConstraintValidatorContext context) {
        if (value != null && value.contains(" ")){
            //获取默认提示信息
            String defaultConstraintMessageTemplate = context.getDefaultConstraintMessageTemplate();
            System.out.println("default message : " + defaultConstraintMessageTemplate);

            //禁用默认提示信息
            context.disableDefaultConstraintViolation();

            //设置提示语
            context.buildConstraintViolationWithTemplate("can not contains blank").addConstraintViolation();

            return false;
        }
        return false;
    }
}

使用：

在属性上面使用注解