package me.zhengjie.common.utils;import me.zhengjie.common.exception.BadRequestException;import java.util.Optional;/** * 验证工具 * @author jie * @date 2018-11-23 */public class ValidationUtil {    /**     * 验证空     * @param optional     */    public static void isNull(Optional optional, String entity,String parameter , Object value){        if(!optional.isPresent()){            String msg = entity                         + " 不存在 "                         +"{ "+ parameter +":"+ value.toString() +" }";            throw new BadRequestException(msg);        }    }    /**     * 验证是否为邮箱     * @param string     * @return     */    public static boolean isEmail(String string) {        if (string == null){            return false;        }        String regEx1 = "^([a-z0-9A-Z]+[-|\\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$";        return string.matches(regEx1);    }}