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validation 参数验证 https://github.com/fashionbrot/validation

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package com.github.fashionbrot.annotation;


import java.lang.annotation.*;


/**
 * 验证 是否为数字
 * String
 * CharSequence
 */
@Documented
@Target({ElementType.FIELD,  ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
public @interface Digits {


    String msg() default "${validated.Digits.msg}";

    /**
     * 是否跳过空值
     * @return boolean
     */
    boolean skipEmpty() default true;
    /**
     * default @see com.github.fashionbrot.groups.DefaultGroup
     * @return groups
     */
    Class[] groups() default  {};

    /**
     * ognl expression
     * @return String
     */
    String expression() default "";
}